FM / traits

/usr/include/boost/process/detail/traits/

/usr/include/boost/process/detail/traits

Name	Size	Mode	Actions
async.hpp	726	0644	edit dl rm
cmd_or_exe.hpp	3615	0644	edit dl rm
decl.hpp	1994	0644	edit dl rm
env.hpp	1553	0644	edit dl rm
error.hpp	600	0644	edit dl rm
group.hpp	687	0644	edit dl rm
wchar_t.hpp	7483	0644	edit dl rm

Edit: /usr/include/boost/process/detail/traits/decl.hpp (1994B)

// Copyright (c) 2016 Klemens D. Morgenstern
//
// 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)

#ifndef BOOST_PROCESS_DETAIL_TRAITS_DECL_HPP_
#define BOOST_PROCESS_DETAIL_TRAITS_DECL_HPP_

#include <boost/process/detail/config.hpp>
#include <boost/none.hpp>
#include <type_traits>

#if defined(BOOST_POSIX_API)
#include <boost/process/detail/posix/handler.hpp>
#elif defined(BOOST_WINDOWS_API)
#include <boost/process/detail/windows/handler.hpp>
#endif

namespace boost { namespace process { namespace detail {

template<typename T>
struct is_initializer : std::is_base_of<handler_base, T> {};

template<typename T>
struct is_initializer<T&> : std::is_base_of<handler_base, T> {};

template<typename T>
struct initializer_tag;// { typedef void type; };

//remove const
template<typename T>
struct initializer_tag<const T> { typedef typename initializer_tag<T>::type type; };

//remove &
template<typename T>
struct initializer_tag<T&> { typedef typename initializer_tag<T>::type type; };

//remove const &
template<typename T>
struct initializer_tag<const T&> { typedef typename initializer_tag<T>::type type; };

template<typename T>
struct initializer_builder;

template<typename First, typename ...Args>
struct valid_argument_list;

template<typename First>
struct valid_argument_list<First>
{
    constexpr static bool value = is_initializer<First>::value || !std::is_void<typename initializer_tag<First>::type>::value;
    typedef std::integral_constant<bool, value> type;
};

template<typename First, typename ...Args>
struct valid_argument_list
{
    constexpr static bool my_value = is_initializer<First>::value || !std::is_void<typename initializer_tag<First>::type>::value;
    constexpr static bool value = valid_argument_list<Args...>::value && my_value;
    typedef std::integral_constant<bool, value> type;
};

}}}

#endif /* BOOST_PROCESS_DETAIL_HANDLER_HPP_ */

cmd: