Boost C++ Libraries

boost/bind/detail/result_traits.hpp

#ifndef BOOST_BIND_DETAIL_RESULT_TRAITS_HPP_INCLUDED
#define BOOST_BIND_DETAIL_RESULT_TRAITS_HPP_INCLUDED

// MS compatible compilers support #pragma once

#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif

//
//  bind/detail/result_traits.hpp
//
//  boost/bind.hpp support header, return type deduction
//
//  Copyright 2006, 2020 Peter Dimov
//
//  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
//
//  See http://www.boost.org/libs/bind/bind.html for documentation.
//

#include <boost/config.hpp>
#include <boost/core/ref.hpp>

#if BOOST_CXX_VERSION >= 201700L
#include <functional>
#endif

namespace boost
{

namespace _bi
{

template<class R, class F> struct result_traits
{
    typedef R type;
};

struct unspecified {};

template<class F> struct result_traits<unspecified, F>
{
    typedef typename F::result_type type;
};

template<class F> struct result_traits< unspecified, reference_wrapper<F> >
{
    typedef typename F::result_type type;
};

#if BOOST_CXX_VERSION >= 201700L

template<class T> struct result_traits< unspecified, std::plus<T> >
{
    typedef T type;
};

template<class T> struct result_traits< unspecified, std::minus<T> >
{
    typedef T type;
};

template<class T> struct result_traits< unspecified, std::multiplies<T> >
{
    typedef T type;
};

template<class T> struct result_traits< unspecified, std::divides<T> >
{
    typedef T type;
};

template<class T> struct result_traits< unspecified, std::modulus<T> >
{
    typedef T type;
};

template<class T> struct result_traits< unspecified, std::negate<T> >
{
    typedef T type;
};

template<class T> struct result_traits< unspecified, std::equal_to<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::not_equal_to<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::greater<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::less<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::greater_equal<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::less_equal<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::logical_and<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::logical_or<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::logical_not<T> >
{
    typedef bool type;
};

template<class T> struct result_traits< unspecified, std::bit_and<T> >
{
    typedef T type;
};

template<class T> struct result_traits< unspecified, std::bit_or<T> >
{
    typedef T type;
};

template<class T> struct result_traits< unspecified, std::bit_xor<T> >
{
    typedef T type;
};

#if defined(BOOST_LIBSTDCXX_VERSION) && BOOST_LIBSTDCXX_VERSION < 40900

// libstdc++ 4.8 and below don't have std::bit_not

#else

template<class T> struct result_traits< unspecified, std::bit_not<T> >
{
    typedef T type;
};

#endif

#endif

} // namespace _bi

} // namespace boost

#endif // #ifndef BOOST_BIND_DETAIL_RESULT_TRAITS_HPP_INCLUDED