0b6a182c
 Hu Chunming
添加无鉴权注册和注销
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#ifndef BOOST_SAFE_NUMERICS_NATIVE_HPP
#define BOOST_SAFE_NUMERICS_NATIVE_HPP
// Copyright (c) 2012 Robert Ramey
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <type_traits>
#include <limits>
// policy which creates results types and values equal to that of C++ promotions.
// When used in conjunction with a desired exception policy, traps errors but
// does not otherwise alter the results produced by the program using it.
namespace boost {
namespace safe_numerics {
struct native {
public:
// arithmetic operators
template<typename T, typename U>
struct addition_result {
using type = decltype(
typename base_type<T>::type()
+ typename base_type<U>::type()
);
};
template<typename T, typename U>
struct subtraction_result {
using type = decltype(
typename base_type<T>::type()
- typename base_type<U>::type()
);
};
template<typename T, typename U>
struct multiplication_result {
using type = decltype(
typename base_type<T>::type()
* typename base_type<U>::type()
);
};
template<typename T, typename U>
struct division_result {
using type = decltype(
typename base_type<T>::type()
/ typename base_type<U>::type()
);
};
template<typename T, typename U>
struct modulus_result {
using type = decltype(
typename base_type<T>::type()
% typename base_type<U>::type()
);
};
// note: comparison_result (<, >, ...) is special.
// The return value is always a bool. The type returned here is
// the intermediate type applied to make the values comparable.
template<typename T, typename U>
struct comparison_result {
using type = decltype(
typename base_type<T>::type()
+ typename base_type<U>::type()
);
};
// shift operators
template<typename T, typename U>
struct left_shift_result {
using type = decltype(
typename base_type<T>::type()
<< typename base_type<U>::type()
);
};
template<typename T, typename U>
struct right_shift_result {
using type = decltype(
typename base_type<T>::type()
>> typename base_type<U>::type()
);
};
// bitwise operators
template<typename T, typename U>
struct bitwise_or_result {
using type = decltype(
typename base_type<T>::type()
| typename base_type<U>::type()
);
};
template<typename T, typename U>
struct bitwise_and_result {
using type = decltype(
typename base_type<T>::type()
& typename base_type<U>::type()
);
};
template<typename T, typename U>
struct bitwise_xor_result {
using type = decltype(
typename base_type<T>::type()
^ typename base_type<U>::type()
);
};
};
} // safe_numerics
} // boost
#endif // BOOST_SAFE_NUMERICS_NATIVE_HPP
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