| 1 | // Copyright (C) 2003, Fernando Luis Cacciola Carballal. |
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| 2 | // |
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| 3 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 4 | // accompanying file LICENSE_1_0.txt or copy at |
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| 5 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | // |
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| 7 | |
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| 8 | |
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| 9 | // |
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| 10 | // NOTE: This file is intended to be used ONLY by the test files |
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| 11 | // from the Numeric Conversions Library |
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| 12 | // |
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| 13 | // |
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| 14 | #include <cmath> |
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| 15 | |
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| 16 | #include "boost/limits.hpp" |
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| 17 | #include "boost/utility.hpp" |
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| 18 | |
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| 19 | #include <boost/core/lightweight_test.hpp> |
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| 20 | #include <stdexcept> // std::runtime_error |
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| 21 | |
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| 22 | // Convenience macros to help with compilers which don't parse |
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| 23 | // explicit template function instantiations (MSVC6) |
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| 24 | #define MATCH_FNTPL_ARG(t) t const* |
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| 25 | #define SET_FNTPL_ARG(t) (static_cast< t const* >(0)) |
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| 26 | |
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| 27 | // |
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| 28 | // *Minimal* example of a User Defined Numeric Type |
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| 29 | // |
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| 30 | // |
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| 31 | namespace MyUDT |
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| 32 | { |
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| 33 | |
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| 34 | template<class T> |
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| 35 | struct UDT |
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| 36 | { |
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| 37 | typedef T builtin_type ; |
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| 38 | |
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| 39 | UDT ( T v_ ) : v (v_) {} |
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| 40 | |
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| 41 | T to_builtin() const { return v ; } |
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| 42 | |
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| 43 | friend bool operator == ( UDT const& lhs, UDT const& rhs ) |
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| 44 | { return lhs.to_builtin() == rhs.to_builtin() ; } |
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| 45 | |
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| 46 | // NOTE: This operator is *required* by the Numeric Conversion Library |
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| 47 | // if Turnc<> is used as the Float2IntRounder policy. |
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| 48 | friend bool operator < ( UDT const& lhs, UDT const& rhs ) |
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| 49 | { return lhs.to_builtin() < rhs.to_builtin() ; } |
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| 50 | |
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| 51 | friend std::ostream& operator << ( std::ostream& os, UDT const& n ) |
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| 52 | { return os << n.to_builtin() ; } |
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| 53 | |
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| 54 | T v ; |
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| 55 | } ; |
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| 56 | |
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| 57 | typedef UDT<int> MyInt ; |
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| 58 | typedef UDT<double> MyFloat ; |
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| 59 | |
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| 60 | // |
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| 61 | // The Float2IntRounder policies *require* a visible 'ceil' or 'floor' math function |
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| 62 | // with standard semantics. |
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| 63 | // In a conformant compiler, ADL can pick these functions even if they are defined |
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| 64 | // within a user namespace, as below. |
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| 65 | // |
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| 66 | inline MyInt ceil ( MyInt const& x ) { return x ; } |
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| 67 | inline MyInt floor ( MyInt const& x ) { return x ; } |
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| 68 | |
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| 69 | inline MyFloat floor ( MyFloat const& x ) |
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| 70 | { |
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| 71 | #if !defined(BOOST_NO_STDC_NAMESPACE) |
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| 72 | return MyFloat ( std::floor(x: x.to_builtin()) ) ; |
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| 73 | #else |
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| 74 | return MyFloat ( ::floor(x.to_builtin()) ) ; |
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| 75 | #endif |
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| 76 | } |
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| 77 | |
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| 78 | inline MyFloat ceil ( MyFloat const& x ) |
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| 79 | { |
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| 80 | #if !defined(BOOST_NO_STDC_NAMESPACE) |
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| 81 | return MyFloat ( std::ceil(x: x.to_builtin()) ) ; |
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| 82 | #else |
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| 83 | return MyFloat ( ::ceil(x.to_builtin()) ) ; |
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| 84 | #endif |
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| 85 | } |
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| 86 | |
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| 87 | } // namespace MyUDT |
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| 88 | |
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| 89 | |
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| 90 | // |
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| 91 | // The Numeric Conversion Library *requires* User Defined Numeric Types |
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| 92 | // to properly specialize std::numeric_limits<> |
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| 93 | // |
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| 94 | namespace std |
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| 95 | { |
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| 96 | |
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| 97 | template<> |
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| 98 | class numeric_limits<MyUDT::MyInt> : public numeric_limits<int> |
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| 99 | { |
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| 100 | public : |
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| 101 | |
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| 102 | BOOST_STATIC_CONSTANT(bool, is_specialized = false); |
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| 103 | } ; |
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| 104 | |
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| 105 | template<> |
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| 106 | class numeric_limits<MyUDT::MyFloat> : public numeric_limits<double> |
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| 107 | { |
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| 108 | public : |
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| 109 | |
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| 110 | BOOST_STATIC_CONSTANT(bool, is_specialized = false); |
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| 111 | } ; |
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| 112 | |
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| 113 | } // namespace std |
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| 114 | |
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| 115 | |
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| 116 | |
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| 117 | // |
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| 118 | // The functions floor and ceil defined within namespace MyUDT |
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| 119 | // should be found by koenig loopkup, but some compilers don't do it right |
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| 120 | // so we inyect them into namespace std so ordinary overload resolution |
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| 121 | // can found them. |
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| 122 | #if defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP) || defined(BOOST_BORLANDC) || defined(__GNUC__) |
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| 123 | namespace std { |
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| 124 | using MyUDT::floor ; |
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| 125 | using MyUDT::ceil ; |
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| 126 | } // namespace std |
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| 127 | #endif |
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| 128 | |
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| 129 | |
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| 130 | std::string to_string( bool arg ) |
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| 131 | { |
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| 132 | return arg ? "true" : "false" ; |
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| 133 | } |
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| 134 | |
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| 135 | std::string to_string( ... ) { throw std::runtime_error("to_string() called with wrong type!" ) ; } |
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| 136 | |
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| 137 | // |
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| 138 | // This is used to print 'char' values as numbers instead of characters. |
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| 139 | // |
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| 140 | template<class T> struct printable_number_type { typedef T type ; } ; |
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| 141 | template<> struct printable_number_type<signed char> { typedef int type ; } ; |
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| 142 | template<> struct printable_number_type<unsigned char> { typedef unsigned type ; } ; |
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| 143 | template<> struct printable_number_type<char> { typedef int type ; } ; |
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| 144 | |
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| 145 | template<class T> |
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| 146 | inline |
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| 147 | typename printable_number_type<T>::type |
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| 148 | printable( T n ) { return n ; } |
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| 149 | |
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| 150 | |
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| 151 | // |
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| 152 | /////////////////////////////////////////////////////////////////////////////////////////////// |
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| 153 | |
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| 154 | |
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