63e88f80
 Hu Chunming
提交三方库
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
#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
|
