63e88f80
 Hu Chunming
提交三方库
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// Copyright John Maddock 2018.
// Use, modification and distribution are subject to 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)
//
// Tools for operator on complex as well as scalar types.
//
#ifndef BOOST_MATH_TOOLS_COMPLEX_HPP
#define BOOST_MATH_TOOLS_COMPLEX_HPP
#include <utility>
#include <boost/math/tools/is_detected.hpp>
namespace boost {
namespace math {
namespace tools {
namespace detail {
template <typename T, typename = void>
struct is_complex_type_impl
{
static constexpr bool value = false;
};
template <typename T>
struct is_complex_type_impl<T, void_t<decltype(std::declval<T>().real()),
decltype(std::declval<T>().imag())>>
{
static constexpr bool value = true;
};
} // Namespace detail
template <typename T>
struct is_complex_type : public detail::is_complex_type_impl<T> {};
//
// Use this trait to typecast integer literals to something
// that will interoperate with T:
//
template <class T, bool = is_complex_type<T>::value>
struct integer_scalar_type
{
typedef int type;
};
template <class T>
struct integer_scalar_type<T, true>
{
typedef typename T::value_type type;
};
template <class T, bool = is_complex_type<T>::value>
struct unsigned_scalar_type
{
typedef unsigned type;
};
template <class T>
struct unsigned_scalar_type<T, true>
{
typedef typename T::value_type type;
};
template <class T, bool = is_complex_type<T>::value>
struct scalar_type
{
typedef T type;
};
template <class T>
struct scalar_type<T, true>
{
typedef typename T::value_type type;
};
} } }
#endif // BOOST_MATH_TOOLS_COMPLEX_HPP
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