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49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
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#ifndef BOOST_MP11_DETAIL_MP_REMOVE_IF_HPP_INCLUDED
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#define BOOST_MP11_DETAIL_MP_REMOVE_IF_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/utility.hpp>
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#include <boost/mp11/detail/mp_list.hpp>
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#include <boost/mp11/detail/mp_append.hpp>
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#include <boost/mp11/detail/config.hpp>
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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_remove_if<L, P>
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namespace detail
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{
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template<class L, template<class...> class P> struct mp_remove_if_impl
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{
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};
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template<template<class...> class L, class... T, template<class...> class P> struct mp_remove_if_impl<L<T...>, P>
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{
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#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1920 )
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template<class U> struct _f { using type = mp_if<P<U>, mp_list<>, mp_list<U>>; };
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using type = mp_append<L<>, typename _f<T>::type...>;
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#else
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template<class U> using _f = mp_if<P<U>, mp_list<>, mp_list<U>>;
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using type = mp_append<L<>, _f<T>...>;
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#endif
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};
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} // namespace detail
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template<class L, template<class...> class P> using mp_remove_if = typename detail::mp_remove_if_impl<L, P>::type;
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template<class L, class Q> using mp_remove_if_q = mp_remove_if<L, Q::template fn>;
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} // namespace mp11
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} // namespace boost
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#endif // #ifndef BOOST_MP11_DETAIL_MP_REMOVE_IF_HPP_INCLUDED
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