227 lines
4.9 KiB
C++
227 lines
4.9 KiB
C++
#ifndef BOOST_MP11_FUNCTION_HPP_INCLUDED
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#define BOOST_MP11_FUNCTION_HPP_INCLUDED
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// Copyright 2015-2019 Peter Dimov.
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//
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// Distributed under the Boost Software License, Version 1.0.
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//
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/mp11/integral.hpp>
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#include <boost/mp11/utility.hpp>
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#include <boost/mp11/detail/mp_list.hpp>
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#include <boost/mp11/detail/mp_count.hpp>
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#include <boost/mp11/detail/mp_plus.hpp>
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#include <boost/mp11/detail/mp_min_element.hpp>
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#include <boost/mp11/detail/mp_void.hpp>
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#include <boost/mp11/detail/config.hpp>
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#include <type_traits>
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namespace boost
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{
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namespace mp11
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{
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// mp_void<T...>
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// in detail/mp_void.hpp
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// mp_and<T...>
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#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1910 )
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namespace detail
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{
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template<class... T> struct mp_and_impl;
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} // namespace detail
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template<class... T> using mp_and = mp_to_bool< typename detail::mp_and_impl<T...>::type >;
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namespace detail
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{
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template<> struct mp_and_impl<>
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{
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using type = mp_true;
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};
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template<class T> struct mp_and_impl<T>
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{
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using type = T;
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};
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template<class T1, class... T> struct mp_and_impl<T1, T...>
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{
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using type = mp_eval_if< mp_not<T1>, T1, mp_and, T... >;
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};
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} // namespace detail
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#else
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namespace detail
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{
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template<class L, class E = void> struct mp_and_impl
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{
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using type = mp_false;
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};
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template<class... T> struct mp_and_impl< mp_list<T...>, mp_void<mp_if<T, void>...> >
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{
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using type = mp_true;
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};
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} // namespace detail
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template<class... T> using mp_and = typename detail::mp_and_impl<mp_list<T...>>::type;
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#endif
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// mp_all<T...>
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// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86355
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#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1920 ) || BOOST_MP11_WORKAROUND( BOOST_MP11_GCC, != 0 )
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template<class... T> using mp_all = mp_bool< mp_count_if< mp_list<T...>, mp_not >::value == 0 >;
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#elif defined( BOOST_MP11_HAS_FOLD_EXPRESSIONS )
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template<class... T> using mp_all = mp_bool<(static_cast<bool>(T::value) && ...)>;
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#else
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template<class... T> using mp_all = mp_and<mp_to_bool<T>...>;
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#endif
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// mp_or<T...>
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namespace detail
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{
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template<class... T> struct mp_or_impl;
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} // namespace detail
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template<class... T> using mp_or = mp_to_bool< typename detail::mp_or_impl<T...>::type >;
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namespace detail
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{
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template<> struct mp_or_impl<>
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{
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using type = mp_false;
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};
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template<class T> struct mp_or_impl<T>
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{
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using type = T;
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};
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template<class T1, class... T> struct mp_or_impl<T1, T...>
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{
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using type = mp_eval_if< T1, T1, mp_or, T... >;
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};
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} // namespace detail
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// mp_any<T...>
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// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86356
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#if defined( BOOST_MP11_HAS_FOLD_EXPRESSIONS ) && !BOOST_MP11_WORKAROUND( BOOST_MP11_GCC, != 0 ) && !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1920 )
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template<class... T> using mp_any = mp_bool<(static_cast<bool>(T::value) || ...)>;
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#else
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template<class... T> using mp_any = mp_bool< mp_count_if< mp_list<T...>, mp_to_bool >::value != 0 >;
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#endif
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// mp_same<T...>
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namespace detail
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{
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template<class... T> struct mp_same_impl;
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template<> struct mp_same_impl<>
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{
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using type = mp_true;
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};
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template<class T1, class... T> struct mp_same_impl<T1, T...>
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{
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using type = mp_all<std::is_same<T1, T>...>;
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};
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} // namespace detail
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template<class... T> using mp_same = typename detail::mp_same_impl<T...>::type;
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// mp_similar<T...>
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namespace detail
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{
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template<class... T> struct mp_similar_impl;
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template<> struct mp_similar_impl<>
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{
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using type = mp_true;
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};
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template<class T> struct mp_similar_impl<T>
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{
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using type = mp_true;
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};
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template<class T> struct mp_similar_impl<T, T>
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{
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using type = mp_true;
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};
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template<class T1, class T2> struct mp_similar_impl<T1, T2>
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{
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using type = mp_false;
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};
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template<template<class...> class L, class... T1, class... T2> struct mp_similar_impl<L<T1...>, L<T2...>>
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{
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using type = mp_true;
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};
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template<template<class...> class L, class... T> struct mp_similar_impl<L<T...>, L<T...>>
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{
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using type = mp_true;
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};
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template<class T1, class T2, class T3, class... T> struct mp_similar_impl<T1, T2, T3, T...>
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{
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using type = mp_all< typename mp_similar_impl<T1, T2>::type, typename mp_similar_impl<T1, T3>::type, typename mp_similar_impl<T1, T>::type... >;
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};
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} // namespace detail
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template<class... T> using mp_similar = typename detail::mp_similar_impl<T...>::type;
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#if BOOST_MP11_GCC
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wsign-compare"
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#endif
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// mp_less<T1, T2>
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template<class T1, class T2> using mp_less = mp_bool<(T1::value < 0 && T2::value >= 0) || ((T1::value < T2::value) && !(T1::value >= 0 && T2::value < 0))>;
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#if BOOST_MP11_GCC
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# pragma GCC diagnostic pop
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#endif
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// mp_min<T...>
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template<class T1, class... T> using mp_min = mp_min_element<mp_list<T1, T...>, mp_less>;
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// mp_max<T...>
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template<class T1, class... T> using mp_max = mp_max_element<mp_list<T1, T...>, mp_less>;
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} // namespace mp11
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} // namespace boost
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#endif // #ifndef BOOST_MP11_FUNCTION_HPP_INCLUDED
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