[857] | 1 | /*=============================================================================
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| 2 | Boost.Wave: A Standard compliant C++ preprocessor library
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| 3 |
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| 4 | http://www.boost.org/
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| 5 |
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| 6 | Copyright (c) 2001-2005 Hartmut Kaiser. Distributed under the Boost
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| 7 | Software License, Version 1.0. (See accompanying file
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| 8 | LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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| 9 | =============================================================================*/
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| 10 |
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| 11 | #if !defined(CPP_EXPRESSION_VALUE_HPP_452FE66D_8754_4107_AF1E_E42255A0C18A_INCLUDED)
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| 12 | #define CPP_EXPRESSION_VALUE_HPP_452FE66D_8754_4107_AF1E_E42255A0C18A_INCLUDED
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| 13 |
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| 14 | #if defined (BOOST_SPIRIT_DEBUG)
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| 15 | #include <iostream>
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| 16 | #endif // defined(BOOST_SPIRIT_DEBUG)
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| 17 |
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| 18 | ///////////////////////////////////////////////////////////////////////////////
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| 19 | namespace boost {
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| 20 | namespace wave {
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| 21 | namespace grammars {
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| 22 | namespace closures {
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| 23 |
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| 24 | ///////////////////////////////////////////////////////////////////////////////
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| 25 | //
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| 26 | // The closure_value class represents the closure type, which is used for the
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| 27 | // expression grammar.
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| 28 | //
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| 29 | // This class was introduced to allow the expression grammar to respect
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| 30 | // the numeric type of a numeric literal or expression result.
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| 31 | //
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| 32 | ///////////////////////////////////////////////////////////////////////////////
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| 33 | class closure_value {
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| 34 | public:
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| 35 |
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| 36 | enum value_type {
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| 37 | is_int = 1,
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| 38 | is_uint = 2,
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| 39 | is_bool = 3
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| 40 | };
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| 41 |
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| 42 | enum value_error {
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| 43 | error_noerror = 0x0,
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| 44 | error_division_by_zero = 0x1,
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| 45 | error_overflow = 0x2
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| 46 | };
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| 47 |
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| 48 | closure_value(value_error valid_ = error_noerror)
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| 49 | : type(is_int), valid(valid_)
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| 50 | { value.i = 0; }
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| 51 | explicit closure_value(int i, value_error valid_ = error_noerror)
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| 52 | : type(is_int), valid(valid_)
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| 53 | { value.i = i; }
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| 54 | explicit closure_value(unsigned int ui, value_error valid_ = error_noerror)
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| 55 | : type(is_uint), valid(valid_)
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| 56 | { value.ui = ui; }
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| 57 | explicit closure_value(long i, value_error valid_ = error_noerror)
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| 58 | : type(is_int), valid(valid_)
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| 59 | { value.i = i; }
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| 60 | explicit closure_value(unsigned long ui, value_error valid_ = error_noerror)
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| 61 | : type(is_uint), valid(valid_)
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| 62 | { value.ui = ui; }
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| 63 | explicit closure_value(bool b, value_error valid_ = error_noerror)
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| 64 | : type(is_bool), valid(valid_)
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| 65 | { value.b = b; }
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| 66 |
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| 67 | value_type get_type() const { return type; }
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| 68 | value_error is_valid() const { return valid; }
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| 69 |
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| 70 | // implicit conversion
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| 71 | operator int() const
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| 72 | {
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| 73 | switch (type) {
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| 74 | case is_uint: return value.ui;
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| 75 | case is_bool: return value.b ? 1 : 0;
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| 76 | case is_int: break;
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| 77 | }
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| 78 | return value.i;
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| 79 | }
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| 80 | operator unsigned int() const
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| 81 | {
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| 82 | switch (type) {
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| 83 | case is_uint: return value.ui;
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| 84 | case is_bool: return value.b ? 1 : 0;
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| 85 | case is_int: break;
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| 86 | }
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| 87 | return value.i;
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| 88 | }
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| 89 | operator long() const
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| 90 | {
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| 91 | switch (type) {
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| 92 | case is_uint: return value.ui;
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| 93 | case is_bool: return value.b ? 1 : 0;
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| 94 | case is_int: break;
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| 95 | }
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| 96 | return value.i;
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| 97 | }
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| 98 | operator unsigned long() const
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| 99 | {
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| 100 | switch (type) {
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| 101 | case is_uint: return value.ui;
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| 102 | case is_bool: return value.b ? 1 : 0;
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| 103 | case is_int: break;
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| 104 | }
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| 105 | return value.i;
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| 106 | }
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| 107 | operator bool() const
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| 108 | {
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| 109 | switch (type) {
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| 110 | case is_uint: return value.ui != 0;
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| 111 | case is_bool: return value.b;
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| 112 | case is_int: break;
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| 113 | }
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| 114 | return value.i != 0.0;
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| 115 | }
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| 116 |
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| 117 | // assignment
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| 118 | closure_value &operator= (closure_value const &rhs)
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| 119 | {
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| 120 | switch (rhs.get_type()) {
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| 121 | case is_int:
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| 122 | value.i = long(rhs);
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| 123 | type = is_int;
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| 124 | break;
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| 125 |
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| 126 | case is_uint:
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| 127 | value.ui = (unsigned long)(rhs);
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| 128 | type = is_uint;
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| 129 | break;
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| 130 |
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| 131 | case is_bool:
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| 132 | value.b = bool(rhs);
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| 133 | type = is_bool;
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| 134 | break;
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| 135 | }
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| 136 | valid = rhs.valid;
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| 137 | return *this;
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| 138 | }
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| 139 | closure_value &operator= (int rhs)
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| 140 | {
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| 141 | type = is_int;
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| 142 | value.i = rhs;
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| 143 | valid = error_noerror;
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| 144 | return *this;
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| 145 | }
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| 146 | closure_value &operator= (unsigned int rhs)
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| 147 | {
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| 148 | type = is_uint;
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| 149 | value.ui = rhs;
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| 150 | valid = error_noerror;
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| 151 | return *this;
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| 152 | }
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| 153 | closure_value &operator= (long rhs)
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| 154 | {
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| 155 | type = is_int;
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| 156 | value.i = rhs;
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| 157 | valid = error_noerror;
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| 158 | return *this;
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| 159 | }
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| 160 | closure_value &operator= (unsigned long rhs)
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| 161 | {
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| 162 | type = is_uint;
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| 163 | value.ui = rhs;
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| 164 | valid = error_noerror;
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| 165 | return *this;
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| 166 | }
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| 167 | closure_value &operator= (bool rhs)
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| 168 | {
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| 169 | type = is_bool;
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| 170 | value.b = rhs;
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| 171 | valid = error_noerror;
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| 172 | return *this;
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| 173 | }
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| 174 |
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| 175 | // arithmetics
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| 176 | closure_value &operator+= (closure_value const &rhs)
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| 177 | {
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| 178 | switch (type) {
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| 179 | case is_int:
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| 180 | switch(rhs.type) {
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| 181 | case is_bool:
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| 182 | {
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| 183 | long result = value.i + long(rhs);
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| 184 | if (rhs.value.i > 0L && value.i > result ||
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| 185 | rhs.value.i < 0L && value.i < result)
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| 186 | {
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| 187 | valid = error_overflow;
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| 188 | }
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| 189 | else {
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| 190 | value.i = result;
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| 191 | }
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| 192 | }
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| 193 | break;
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| 194 |
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| 195 | case is_int:
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| 196 | {
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| 197 | long result = value.i + rhs.value.i;
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| 198 | if (rhs.value.i > 0L && value.i > result ||
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| 199 | rhs.value.i < 0L && value.i < result)
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| 200 | {
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| 201 | valid = error_overflow;
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| 202 | }
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| 203 | else {
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| 204 | value.i = result;
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| 205 | }
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| 206 | }
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| 207 | break;
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| 208 |
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| 209 | case is_uint:
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| 210 | {
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| 211 | unsigned long result = value.ui + rhs.value.ui;
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| 212 | if (result < value.ui) {
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| 213 | valid = error_overflow;
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| 214 | }
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| 215 | else {
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| 216 | value.ui = result;
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| 217 | type = is_uint;
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| 218 | }
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| 219 | }
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| 220 | break;
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| 221 | }
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| 222 | break;
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| 223 |
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| 224 | case is_uint:
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| 225 | {
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| 226 | unsigned long result = value.ui + (unsigned long)(rhs);
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| 227 | if (result < value.ui) {
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| 228 | valid = error_overflow;
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| 229 | }
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| 230 | else {
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| 231 | value.ui = result;
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| 232 | }
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| 233 | }
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| 234 | break;
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| 235 |
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| 236 | case is_bool:
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| 237 | value.i = value.b + bool(rhs);
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| 238 | type = is_int;
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| 239 | }
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| 240 | valid = (value_error)(valid | rhs.valid);
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| 241 | return *this;
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| 242 | }
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| 243 | closure_value &operator-= (closure_value const &rhs)
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| 244 | {
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| 245 | switch (type) {
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| 246 | case is_int:
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| 247 | switch(rhs.type) {
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| 248 | case is_bool:
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| 249 | {
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| 250 | long result = value.i - long(rhs);
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| 251 | if (rhs.value.i > 0L && result > value.i ||
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| 252 | rhs.value.i < 0L && result < value.i)
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| 253 | {
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| 254 | valid = error_overflow;
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| 255 | }
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| 256 | else {
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| 257 | value.i = result;
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| 258 | }
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| 259 | }
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| 260 | break;
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| 261 |
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| 262 | case is_int:
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| 263 | {
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| 264 | long result = value.i - rhs.value.i;
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| 265 | if (rhs.value.i > 0L && result > value.i ||
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| 266 | rhs.value.i < 0L && result < value.i)
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| 267 | {
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| 268 | valid = error_overflow;
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| 269 | }
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| 270 | else {
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| 271 | value.i = result;
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| 272 | }
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| 273 | }
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| 274 | break;
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| 275 |
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| 276 | case is_uint:
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| 277 | {
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| 278 | unsigned long result = value.ui - rhs.value.ui;
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| 279 | if (result > value.ui) {
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| 280 | valid = error_overflow;
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| 281 | }
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| 282 | else {
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| 283 | value.ui = result;
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| 284 | type = is_uint;
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| 285 | }
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| 286 | }
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| 287 | break;
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| 288 | }
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| 289 | break;
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| 290 |
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| 291 | case is_uint:
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| 292 | switch(rhs.type) {
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| 293 | case is_bool:
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| 294 | {
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| 295 | unsigned long result = value.ui - (unsigned long)(rhs);
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| 296 | if (result > value.ui)
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| 297 | {
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| 298 | valid = error_overflow;
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| 299 | }
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| 300 | else {
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| 301 | value.ui = result;
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| 302 | }
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| 303 | }
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| 304 | break;
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| 305 |
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| 306 | case is_int:
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| 307 | {
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| 308 | unsigned long result = value.ui - rhs.value.i;
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| 309 | if (rhs.value.i > 0L && result > value.ui ||
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| 310 | rhs.value.i < 0L && result < value.ui)
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| 311 | {
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| 312 | valid = error_overflow;
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| 313 | }
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| 314 | else {
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| 315 | value.ui = result;
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| 316 | }
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| 317 | }
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| 318 | break;
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| 319 |
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| 320 | case is_uint:
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| 321 | {
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| 322 | unsigned long result = value.ui - rhs.value.ui;
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| 323 | if (result > value.ui) {
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| 324 | valid = error_overflow;
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| 325 | }
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| 326 | else {
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| 327 | value.ui = result;
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| 328 | }
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| 329 | }
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| 330 | break;
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| 331 | }
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| 332 | break;
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| 333 |
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| 334 | case is_bool:
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| 335 | value.i = value.b - bool(rhs);
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| 336 | type = is_int;
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| 337 | }
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| 338 | valid = (value_error)(valid | rhs.valid);
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| 339 | return *this;
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| 340 | }
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| 341 | closure_value &operator*= (closure_value const &rhs)
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| 342 | {
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| 343 | switch (type) {
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| 344 | case is_int:
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| 345 | switch(rhs.type) {
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| 346 | case is_bool: value.i *= long(rhs); break;
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| 347 | case is_int:
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| 348 | {
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| 349 | long result = value.i * rhs.value.i;
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| 350 | if (0 != value.i && 0 != rhs.value.i &&
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| 351 | (result / value.i != rhs.value.i ||
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| 352 | result / rhs.value.i != value.i)
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| 353 | )
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| 354 | {
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| 355 | valid = error_overflow;
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| 356 | }
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| 357 | else {
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| 358 | value.i = result;
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| 359 | }
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| 360 | }
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| 361 | break;
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| 362 |
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| 363 | case is_uint:
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| 364 | {
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| 365 | unsigned long result = value.ui * rhs.value.ui;
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| 366 | if (0 != value.ui && 0 != rhs.value.ui &&
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| 367 | (result / value.ui != rhs.value.ui ||
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| 368 | result / rhs.value.ui != value.ui)
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| 369 | )
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| 370 | {
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| 371 | valid = error_overflow;
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| 372 | }
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| 373 | else {
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| 374 | value.ui = result;
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| 375 | type = is_uint;
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| 376 | }
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| 377 | }
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| 378 | break;
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| 379 | }
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| 380 | break;
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| 381 |
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| 382 | case is_uint:
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| 383 | {
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| 384 | unsigned long rhs_val = (unsigned long)(rhs);
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| 385 | unsigned long result = value.ui * rhs_val;
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| 386 | if (0 != value.ui && 0 != rhs_val &&
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| 387 | (result / value.ui != rhs_val ||
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| 388 | result / rhs_val != value.ui)
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| 389 | )
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| 390 | {
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| 391 | valid = error_overflow;
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| 392 | }
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| 393 | else {
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| 394 | value.ui = result;
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| 395 | type = is_uint;
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| 396 | }
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| 397 | }
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| 398 | break;
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| 399 |
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| 400 | case is_bool:
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| 401 | switch (rhs.type) {
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| 402 | case is_int:
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| 403 | value.i = (value.b ? 1 : 0) * rhs.value.i;
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| 404 | type = is_int;
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| 405 | break;
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| 406 |
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| 407 | case is_uint:
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| 408 | value.ui = (value.b ? 1 : 0) * rhs.value.ui;
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| 409 | type = is_uint;
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| 410 | break;
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| 411 |
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| 412 | case is_bool:
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| 413 | value.b = 0 != ((value.b ? 1 : 0) * (rhs.value.b ? 1 : 0));
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| 414 | break;
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| 415 | }
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| 416 | }
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| 417 | valid = (value_error)(valid | rhs.valid);
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| 418 | return *this;
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| 419 | }
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| 420 | closure_value &operator/= (closure_value const &rhs)
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| 421 | {
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| 422 | switch (type) {
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| 423 | case is_int:
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| 424 | switch(rhs.type) {
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| 425 | case is_bool:
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| 426 | case is_int:
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| 427 | if (long(rhs) != 0) {
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| 428 | if (value.i == -value.i && -1 == rhs.value.i) {
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| 429 | // LONG_MIN / -1 on two's complement
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| 430 | valid = error_overflow;
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| 431 | }
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| 432 | else {
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| 433 | value.i /= long(rhs);
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| 434 | }
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| 435 | }
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| 436 | else {
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| 437 | valid = error_division_by_zero; // division by zero
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| 438 | }
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| 439 | break;
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| 440 |
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| 441 | case is_uint:
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| 442 | if (rhs.value.ui != 0) {
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| 443 | value.ui /= rhs.value.ui;
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| 444 | type = is_uint;
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| 445 | }
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| 446 | else {
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| 447 | valid = error_division_by_zero; // division by zero
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| 448 | }
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| 449 | break;
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| 450 | }
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| 451 | break;
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| 452 |
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| 453 | case is_uint:
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| 454 | if ((unsigned long)(rhs) != 0)
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| 455 | value.ui /= (unsigned long)(rhs);
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| 456 | else
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| 457 | valid = error_division_by_zero; // division by zero
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| 458 | break;
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| 459 |
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| 460 | case is_bool:
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| 461 | if (bool(rhs)) {
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| 462 | switch(rhs.type) {
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| 463 | case is_int:
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| 464 | value.i = (value.b ? 1 : 0) / rhs.value.i;
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| 465 | type = is_int;
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| 466 | break;
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| 467 |
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| 468 | case is_uint:
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| 469 | value.i = (value.b ? 1 : 0) / rhs.value.ui;
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| 470 | type = is_int;
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| 471 | break;
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| 472 |
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| 473 | case is_bool:
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| 474 | break;
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| 475 | }
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| 476 | }
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| 477 | else {
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| 478 | valid = error_division_by_zero; // division by zero
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| 479 | }
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| 480 | }
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| 481 | return *this;
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| 482 | }
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| 483 | closure_value &operator%= (closure_value const &rhs)
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| 484 | {
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| 485 | switch (type) {
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| 486 | case is_int:
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| 487 | switch(rhs.type) {
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| 488 | case is_bool:
|
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| 489 | case is_int:
|
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| 490 | if (long(rhs) != 0) {
|
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| 491 | if (value.i == -value.i && -1 == rhs.value.i) {
|
---|
| 492 | // LONG_MIN % -1 on two's complement
|
---|
| 493 | valid = error_overflow;
|
---|
| 494 | }
|
---|
| 495 | else {
|
---|
| 496 | value.i %= long(rhs);
|
---|
| 497 | }
|
---|
| 498 | }
|
---|
| 499 | else {
|
---|
| 500 | valid = error_division_by_zero; // division by zero
|
---|
| 501 | }
|
---|
| 502 | break;
|
---|
| 503 |
|
---|
| 504 | case is_uint:
|
---|
| 505 | if (rhs.value.ui != 0) {
|
---|
| 506 | value.ui %= rhs.value.ui;
|
---|
| 507 | type = is_uint;
|
---|
| 508 | }
|
---|
| 509 | else {
|
---|
| 510 | valid = error_division_by_zero; // division by zero
|
---|
| 511 | }
|
---|
| 512 | break;
|
---|
| 513 | }
|
---|
| 514 | break;
|
---|
| 515 |
|
---|
| 516 | case is_uint:
|
---|
| 517 | if ((unsigned long)(rhs) != 0)
|
---|
| 518 | value.ui %= (unsigned long)(rhs);
|
---|
| 519 | else
|
---|
| 520 | valid = error_division_by_zero; // division by zero
|
---|
| 521 | break;
|
---|
| 522 |
|
---|
| 523 | case is_bool:
|
---|
| 524 | if (bool(rhs)) {
|
---|
| 525 | switch(rhs.type) {
|
---|
| 526 | case is_int:
|
---|
| 527 | value.i = (value.b ? 1 : 0) % rhs.value.i;
|
---|
| 528 | type = is_int;
|
---|
| 529 | break;
|
---|
| 530 |
|
---|
| 531 | case is_uint:
|
---|
| 532 | value.i = (value.b ? 1 : 0) % rhs.value.ui;
|
---|
| 533 | type = is_int;
|
---|
| 534 | break;
|
---|
| 535 |
|
---|
| 536 | case is_bool:
|
---|
| 537 | break;
|
---|
| 538 | }
|
---|
| 539 | }
|
---|
| 540 | else {
|
---|
| 541 | valid = error_division_by_zero; // division by zero
|
---|
| 542 | }
|
---|
| 543 | }
|
---|
| 544 | return *this;
|
---|
| 545 | }
|
---|
| 546 |
|
---|
| 547 | friend closure_value
|
---|
| 548 | operator- (closure_value const &rhs)
|
---|
| 549 | {
|
---|
| 550 | switch (rhs.type) {
|
---|
| 551 | case is_int:
|
---|
| 552 | {
|
---|
| 553 | long value = long(rhs);
|
---|
| 554 | if (value != 0 && value == -value)
|
---|
| 555 | return closure_value(-value, error_overflow);
|
---|
| 556 | return closure_value(-value, rhs.valid);
|
---|
| 557 | }
|
---|
| 558 |
|
---|
| 559 | case is_bool: return closure_value(-long(rhs), rhs.valid);
|
---|
| 560 | case is_uint: break;
|
---|
| 561 | }
|
---|
| 562 |
|
---|
| 563 | long value = (unsigned long)(rhs);
|
---|
| 564 | if (value != 0 && value == -value)
|
---|
| 565 | return closure_value(-value, error_overflow);
|
---|
| 566 | return closure_value(-value, rhs.valid);
|
---|
| 567 | }
|
---|
| 568 | friend closure_value
|
---|
| 569 | operator~ (closure_value const &rhs)
|
---|
| 570 | {
|
---|
| 571 | return closure_value(~(unsigned long)(rhs), rhs.valid);
|
---|
| 572 | }
|
---|
| 573 | friend closure_value
|
---|
| 574 | operator! (closure_value const &rhs)
|
---|
| 575 | {
|
---|
| 576 | switch (rhs.type) {
|
---|
| 577 | case is_int: return closure_value(!long(rhs), rhs.valid);
|
---|
| 578 | case is_bool: return closure_value(!bool(rhs), rhs.valid);
|
---|
| 579 | case is_uint: break;
|
---|
| 580 | }
|
---|
| 581 | return closure_value(!(unsigned long)(rhs), rhs.valid);
|
---|
| 582 | }
|
---|
| 583 |
|
---|
| 584 | // comparison
|
---|
| 585 | friend closure_value
|
---|
| 586 | operator== (closure_value const &lhs, closure_value const &rhs)
|
---|
| 587 | {
|
---|
| 588 | bool cmp = false;
|
---|
| 589 | switch (lhs.type) {
|
---|
| 590 | case is_int:
|
---|
| 591 | switch(rhs.type) {
|
---|
| 592 | case is_bool: cmp = bool(lhs) == rhs.value.b; break;
|
---|
| 593 | case is_int: cmp = lhs.value.i == rhs.value.i; break;
|
---|
| 594 | case is_uint: cmp = lhs.value.ui == rhs.value.ui; break;
|
---|
| 595 | }
|
---|
| 596 | break;
|
---|
| 597 |
|
---|
| 598 | case is_uint: cmp = lhs.value.ui == (unsigned long)(rhs); break;
|
---|
| 599 | case is_bool: cmp = lhs.value.b == bool(rhs); break;
|
---|
| 600 | }
|
---|
| 601 | return closure_value(cmp, (value_error)(lhs.valid & rhs.valid));
|
---|
| 602 | }
|
---|
| 603 | friend closure_value
|
---|
| 604 | operator!= (closure_value const &lhs, closure_value const &rhs)
|
---|
| 605 | {
|
---|
| 606 | return closure_value(!bool(lhs == rhs), (value_error)(lhs.valid & rhs.valid));
|
---|
| 607 | }
|
---|
| 608 | friend closure_value
|
---|
| 609 | operator> (closure_value const &lhs, closure_value const &rhs)
|
---|
| 610 | {
|
---|
| 611 | bool cmp = false;
|
---|
| 612 | switch (lhs.type) {
|
---|
| 613 | case is_int:
|
---|
| 614 | switch(rhs.type) {
|
---|
| 615 | case is_bool: cmp = lhs.value.i > long(rhs); break;
|
---|
| 616 | case is_int: cmp = lhs.value.i > rhs.value.i; break;
|
---|
| 617 | case is_uint: cmp = lhs.value.ui > rhs.value.ui; break;
|
---|
| 618 | }
|
---|
| 619 | break;
|
---|
| 620 |
|
---|
| 621 | case is_uint: cmp = lhs.value.ui > (unsigned long)(rhs); break;
|
---|
| 622 | case is_bool: cmp = lhs.value.b > bool(rhs); break;
|
---|
| 623 | }
|
---|
| 624 | return closure_value(cmp, (value_error)(lhs.valid & rhs.valid));
|
---|
| 625 | }
|
---|
| 626 | friend closure_value
|
---|
| 627 | operator< (closure_value const &lhs, closure_value const &rhs)
|
---|
| 628 | {
|
---|
| 629 | bool cmp = false;
|
---|
| 630 | switch (lhs.type) {
|
---|
| 631 | case is_int: cmp = long(lhs) < long(rhs); break;
|
---|
| 632 | switch(rhs.type) {
|
---|
| 633 | case is_bool: cmp = lhs.value.i < long(rhs); break;
|
---|
| 634 | case is_int: cmp = lhs.value.i < rhs.value.i; break;
|
---|
| 635 | case is_uint: cmp = lhs.value.ui < rhs.value.ui; break;
|
---|
| 636 | }
|
---|
| 637 | break;
|
---|
| 638 |
|
---|
| 639 | case is_uint: cmp = lhs.value.ui < (unsigned long)(rhs); break;
|
---|
| 640 | case is_bool: cmp = bool(lhs) < bool(rhs); break;
|
---|
| 641 | }
|
---|
| 642 | return closure_value(cmp, (value_error)(lhs.valid & rhs.valid));
|
---|
| 643 | }
|
---|
| 644 | friend closure_value
|
---|
| 645 | operator<= (closure_value const &lhs, closure_value const &rhs)
|
---|
| 646 | {
|
---|
| 647 | return closure_value(!bool(lhs > rhs), (value_error)(lhs.valid & rhs.valid));
|
---|
| 648 | }
|
---|
| 649 | friend closure_value
|
---|
| 650 | operator>= (closure_value const &lhs, closure_value const &rhs)
|
---|
| 651 | {
|
---|
| 652 | return closure_value(!bool(lhs < rhs), (value_error)(lhs.valid & rhs.valid));
|
---|
| 653 | }
|
---|
| 654 |
|
---|
| 655 | closure_value &
|
---|
| 656 | operator<<= (closure_value const &rhs)
|
---|
| 657 | {
|
---|
| 658 | switch (type) {
|
---|
| 659 | case is_bool:
|
---|
| 660 | case is_int:
|
---|
| 661 | switch (rhs.type) {
|
---|
| 662 | case is_bool:
|
---|
| 663 | case is_int:
|
---|
| 664 | {
|
---|
| 665 | long shift_by = long(rhs);
|
---|
| 666 |
|
---|
| 667 | if (shift_by > 64)
|
---|
| 668 | shift_by = 64;
|
---|
| 669 | else if (shift_by < -64)
|
---|
| 670 | shift_by = -64;
|
---|
| 671 | value.i <<= shift_by;
|
---|
| 672 | }
|
---|
| 673 | break;
|
---|
| 674 |
|
---|
| 675 | case is_uint:
|
---|
| 676 | {
|
---|
| 677 | unsigned long shift_by = (unsigned long)(rhs);
|
---|
| 678 |
|
---|
| 679 | if (shift_by > 64)
|
---|
| 680 | shift_by = 64;
|
---|
| 681 | value.ui <<= shift_by;
|
---|
| 682 |
|
---|
| 683 | // Note: The usual arithmetic conversions are not performed on
|
---|
| 684 | // bit shift operations.
|
---|
| 685 | }
|
---|
| 686 | break;
|
---|
| 687 | }
|
---|
| 688 | break;
|
---|
| 689 |
|
---|
| 690 | case is_uint:
|
---|
| 691 | switch (rhs.type) {
|
---|
| 692 | case is_bool:
|
---|
| 693 | case is_int:
|
---|
| 694 | {
|
---|
| 695 | long shift_by = long(rhs);
|
---|
| 696 |
|
---|
| 697 | if (shift_by > 64)
|
---|
| 698 | shift_by = 64;
|
---|
| 699 | else if (shift_by < -64)
|
---|
| 700 | shift_by = -64;
|
---|
| 701 | value.ui <<= shift_by;
|
---|
| 702 | }
|
---|
| 703 | break;
|
---|
| 704 |
|
---|
| 705 | case is_uint:
|
---|
| 706 | {
|
---|
| 707 | unsigned long shift_by = (unsigned long)(rhs);
|
---|
| 708 |
|
---|
| 709 | if (shift_by > 64)
|
---|
| 710 | shift_by = 64;
|
---|
| 711 | value.ui <<= shift_by;
|
---|
| 712 | }
|
---|
| 713 | break;
|
---|
| 714 | }
|
---|
| 715 | }
|
---|
| 716 | valid = (value_error)(valid | rhs.valid);
|
---|
| 717 | return *this;
|
---|
| 718 | }
|
---|
| 719 |
|
---|
| 720 | closure_value &
|
---|
| 721 | operator>>= (closure_value const &rhs)
|
---|
| 722 | {
|
---|
| 723 | switch (type) {
|
---|
| 724 | case is_bool:
|
---|
| 725 | case is_int:
|
---|
| 726 | switch (rhs.type) {
|
---|
| 727 | case is_bool:
|
---|
| 728 | case is_int:
|
---|
| 729 | {
|
---|
| 730 | long shift_by = long(rhs);
|
---|
| 731 |
|
---|
| 732 | if (shift_by > 64)
|
---|
| 733 | shift_by = 64;
|
---|
| 734 | else if (shift_by < -64)
|
---|
| 735 | shift_by = -64;
|
---|
| 736 | value.i >>= shift_by;
|
---|
| 737 | }
|
---|
| 738 | break;
|
---|
| 739 |
|
---|
| 740 | case is_uint:
|
---|
| 741 | {
|
---|
| 742 | unsigned long shift_by = (unsigned long)(rhs);
|
---|
| 743 |
|
---|
| 744 | if (shift_by > 64)
|
---|
| 745 | shift_by = 64;
|
---|
| 746 | value.ui >>= shift_by;
|
---|
| 747 |
|
---|
| 748 | // Note: The usual arithmetic conversions are not performed on
|
---|
| 749 | // bit shift operations.
|
---|
| 750 | }
|
---|
| 751 | break;
|
---|
| 752 | }
|
---|
| 753 | break;
|
---|
| 754 |
|
---|
| 755 | case is_uint:
|
---|
| 756 | switch (rhs.type) {
|
---|
| 757 | case is_bool:
|
---|
| 758 | case is_int:
|
---|
| 759 | {
|
---|
| 760 | long shift_by = long(rhs);
|
---|
| 761 |
|
---|
| 762 | if (shift_by > 64)
|
---|
| 763 | shift_by = 64;
|
---|
| 764 | else if (shift_by < -64)
|
---|
| 765 | shift_by = -64;
|
---|
| 766 | value.ui >>= shift_by;
|
---|
| 767 | }
|
---|
| 768 | break;
|
---|
| 769 |
|
---|
| 770 | case is_uint:
|
---|
| 771 | {
|
---|
| 772 | unsigned long shift_by = (unsigned long)(rhs);
|
---|
| 773 |
|
---|
| 774 | if (shift_by > 64)
|
---|
| 775 | shift_by = 64;
|
---|
| 776 | value.ui >>= shift_by;
|
---|
| 777 | }
|
---|
| 778 | break;
|
---|
| 779 | }
|
---|
| 780 | break;
|
---|
| 781 | }
|
---|
| 782 | valid = (value_error)(valid | rhs.valid);
|
---|
| 783 | return *this;
|
---|
| 784 | }
|
---|
| 785 |
|
---|
| 786 | friend closure_value
|
---|
| 787 | operator|| (closure_value const &lhs, closure_value const &rhs)
|
---|
| 788 | {
|
---|
| 789 | bool result = bool(lhs) || bool(rhs);
|
---|
| 790 | return closure_value(result, (value_error)(lhs.valid & rhs.valid));
|
---|
| 791 | }
|
---|
| 792 |
|
---|
| 793 | friend closure_value
|
---|
| 794 | operator&& (closure_value const &lhs, closure_value const &rhs)
|
---|
| 795 | {
|
---|
| 796 | bool result = bool(lhs) && bool(rhs);
|
---|
| 797 | return closure_value(result, (value_error)(lhs.valid & rhs.valid));
|
---|
| 798 | }
|
---|
| 799 |
|
---|
| 800 | // handle the ?: operator
|
---|
| 801 | closure_value &
|
---|
| 802 | handle_questionmark(closure_value const &cond, closure_value const &val2)
|
---|
| 803 | {
|
---|
| 804 | switch (type) {
|
---|
| 805 | case is_int:
|
---|
| 806 | switch (val2.type) {
|
---|
| 807 | case is_bool: value.b = bool(cond) ? value.b : bool(val2); break;
|
---|
| 808 | case is_int: value.i = bool(cond) ? value.i : long(val2); break;
|
---|
| 809 | case is_uint:
|
---|
| 810 | value.ui = bool(cond) ? value.ui : (unsigned long)(val2);
|
---|
| 811 | type = is_uint; // changing type!
|
---|
| 812 | break;
|
---|
| 813 | }
|
---|
| 814 | break;
|
---|
| 815 |
|
---|
| 816 | case is_uint: value.ui = bool(cond) ? value.ui : (unsigned long)(val2); break;
|
---|
| 817 | case is_bool: value.b = bool(cond) ? value.b : bool(val2); break;
|
---|
| 818 | }
|
---|
| 819 | valid = bool(cond) ? valid : val2.valid;
|
---|
| 820 | return *this;
|
---|
| 821 | }
|
---|
| 822 |
|
---|
| 823 | #if defined (BOOST_SPIRIT_DEBUG)
|
---|
| 824 | friend std::ostream&
|
---|
| 825 | operator<< (std::ostream &o, closure_value const &val)
|
---|
| 826 | {
|
---|
| 827 | switch (val.type) {
|
---|
| 828 | case is_int: o << "int(" << long(val) << ")"; break;
|
---|
| 829 | case is_uint: o << "unsigned int(" << (unsigned long)(val) << ")"; break;
|
---|
| 830 | case is_bool: o << "bool(" << bool(val) << ")"; break;
|
---|
| 831 | }
|
---|
| 832 | return o;
|
---|
| 833 | }
|
---|
| 834 | #endif // defined(BOOST_SPIRIT_DEBUG)
|
---|
| 835 |
|
---|
| 836 | private:
|
---|
| 837 | value_type type;
|
---|
| 838 | union {
|
---|
| 839 | long i;
|
---|
| 840 | unsigned long ui;
|
---|
| 841 | bool b;
|
---|
| 842 | } value;
|
---|
| 843 | value_error valid;
|
---|
| 844 | };
|
---|
| 845 |
|
---|
| 846 | ///////////////////////////////////////////////////////////////////////////////
|
---|
| 847 | } // namespace closures
|
---|
| 848 | } // namespace grammars
|
---|
| 849 | } // namespace wave
|
---|
| 850 | } // namespace boost
|
---|
| 851 |
|
---|
| 852 | #endif // !defined(CPP_EXPRESSION_VALUE_HPP_452FE66D_8754_4107_AF1E_E42255A0C18A_INCLUDED)
|
---|