mirror of
https://github.com/yuzu-emu/ext-boost.git
synced 2024-12-22 23:15:39 +00:00
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
#ifndef BOOST_MP11_INTEGER_SEQUENCE_HPP_INCLUDED
|
|
#define BOOST_MP11_INTEGER_SEQUENCE_HPP_INCLUDED
|
|
|
|
// Copyright 2015, 2017, 2019 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
|
|
|
|
#include <boost/mp11/version.hpp>
|
|
#include <cstddef>
|
|
|
|
#if defined(__has_builtin)
|
|
# if __has_builtin(__make_integer_seq)
|
|
# define BOOST_MP11_HAS_MAKE_INTEGER_SEQ
|
|
# endif
|
|
#endif
|
|
|
|
namespace boost
|
|
{
|
|
namespace mp11
|
|
{
|
|
|
|
// integer_sequence
|
|
template<class T, T... I> struct integer_sequence
|
|
{
|
|
};
|
|
|
|
#if defined(BOOST_MP11_HAS_MAKE_INTEGER_SEQ)
|
|
|
|
template<class T, T N> using make_integer_sequence = __make_integer_seq<integer_sequence, T, N>;
|
|
|
|
#else
|
|
|
|
// detail::make_integer_sequence_impl
|
|
namespace detail
|
|
{
|
|
|
|
// iseq_if_c
|
|
template<bool C, class T, class E> struct iseq_if_c_impl;
|
|
|
|
template<class T, class E> struct iseq_if_c_impl<true, T, E>
|
|
{
|
|
using type = T;
|
|
};
|
|
|
|
template<class T, class E> struct iseq_if_c_impl<false, T, E>
|
|
{
|
|
using type = E;
|
|
};
|
|
|
|
template<bool C, class T, class E> using iseq_if_c = typename iseq_if_c_impl<C, T, E>::type;
|
|
|
|
// iseq_identity
|
|
template<class T> struct iseq_identity
|
|
{
|
|
using type = T;
|
|
};
|
|
|
|
template<class S1, class S2> struct append_integer_sequence;
|
|
|
|
template<class T, T... I, T... J> struct append_integer_sequence<integer_sequence<T, I...>, integer_sequence<T, J...>>
|
|
{
|
|
using type = integer_sequence< T, I..., ( J + sizeof...(I) )... >;
|
|
};
|
|
|
|
template<class T, T N> struct make_integer_sequence_impl;
|
|
|
|
template<class T, T N> struct make_integer_sequence_impl_
|
|
{
|
|
private:
|
|
|
|
static_assert( N >= 0, "make_integer_sequence<T, N>: N must not be negative" );
|
|
|
|
static T const M = N / 2;
|
|
static T const R = N % 2;
|
|
|
|
using S1 = typename make_integer_sequence_impl<T, M>::type;
|
|
using S2 = typename append_integer_sequence<S1, S1>::type;
|
|
using S3 = typename make_integer_sequence_impl<T, R>::type;
|
|
using S4 = typename append_integer_sequence<S2, S3>::type;
|
|
|
|
public:
|
|
|
|
using type = S4;
|
|
};
|
|
|
|
template<class T, T N> struct make_integer_sequence_impl: iseq_if_c<N == 0, iseq_identity<integer_sequence<T>>, iseq_if_c<N == 1, iseq_identity<integer_sequence<T, 0>>, make_integer_sequence_impl_<T, N> > >
|
|
{
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
// make_integer_sequence
|
|
template<class T, T N> using make_integer_sequence = typename detail::make_integer_sequence_impl<T, N>::type;
|
|
|
|
#endif // defined(BOOST_MP11_HAS_MAKE_INTEGER_SEQ)
|
|
|
|
// index_sequence
|
|
template<std::size_t... I> using index_sequence = integer_sequence<std::size_t, I...>;
|
|
|
|
// make_index_sequence
|
|
template<std::size_t N> using make_index_sequence = make_integer_sequence<std::size_t, N>;
|
|
|
|
// index_sequence_for
|
|
template<class... T> using index_sequence_for = make_integer_sequence<std::size_t, sizeof...(T)>;
|
|
|
|
} // namespace mp11
|
|
} // namespace boost
|
|
|
|
#endif // #ifndef BOOST_MP11_INTEGER_SEQUENCE_HPP_INCLUDED
|