1#ifndef BOOST_MP11_DETAIL_MP_PLUS_HPP_INCLUDED
2#define BOOST_MP11_DETAIL_MP_PLUS_HPP_INCLUDED
3
4// Copyright 2015 Peter Dimov.
5//
6// Distributed under the Boost Software License, Version 1.0.
7//
8// See accompanying file LICENSE_1_0.txt or copy at
9// http://www.boost.org/LICENSE_1_0.txt
10
11#include <boost/mp11/detail/config.hpp>
12#include <type_traits>
13
14namespace boost
15{
16namespace mp11
17{
18
19// mp_plus
20namespace detail
21{
22
23#if defined( BOOST_MP11_HAS_FOLD_EXPRESSIONS ) && !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, != 0 ) && !BOOST_MP11_WORKAROUND( BOOST_MP11_CLANG, != 0 )
24
25// msvc fails with parser stack overflow for large sizeof...(T)
26// clang exceeds -fbracket-depth, which defaults to 256
27
28template<class... T> struct mp_plus_impl
29{
30 static const auto _v = (T::value + ... + 0);
31 using type = std::integral_constant<typename std::remove_const<decltype(_v)>::type, _v>;
32};
33
34#else
35
36template<class... T> struct mp_plus_impl;
37
38template<> struct mp_plus_impl<>
39{
40 using type = std::integral_constant<int, 0>;
41};
42
43#if BOOST_MP11_WORKAROUND( BOOST_MP11_GCC, < 40800 )
44
45template<class T1, class... T> struct mp_plus_impl<T1, T...>
46{
47 static const decltype(T1::value + mp_plus_impl<T...>::type::value) _v = T1::value + mp_plus_impl<T...>::type::value;
48 using type = std::integral_constant<typename std::remove_const<decltype(_v)>::type, _v>;
49};
50
51template<class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10, class... T> struct mp_plus_impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T...>
52{
53 static const
54 decltype(T1::value + T2::value + T3::value + T4::value + T5::value + T6::value + T7::value + T8::value + T9::value + T10::value + mp_plus_impl<T...>::type::value)
55 _v = T1::value + T2::value + T3::value + T4::value + T5::value + T6::value + T7::value + T8::value + T9::value + T10::value + mp_plus_impl<T...>::type::value;
56 using type = std::integral_constant<typename std::remove_const<decltype(_v)>::type, _v>;
57};
58
59#else
60
61template<class T1, class... T> struct mp_plus_impl<T1, T...>
62{
63 static const auto _v = T1::value + mp_plus_impl<T...>::type::value;
64 using type = std::integral_constant<typename std::remove_const<decltype(_v)>::type, _v>;
65};
66
67template<class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10, class... T> struct mp_plus_impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T...>
68{
69 static const auto _v = T1::value + T2::value + T3::value + T4::value + T5::value + T6::value + T7::value + T8::value + T9::value + T10::value + mp_plus_impl<T...>::type::value;
70 using type = std::integral_constant<typename std::remove_const<decltype(_v)>::type, _v>;
71};
72
73#endif
74
75#endif
76
77} // namespace detail
78
79template<class... T> using mp_plus = typename detail::mp_plus_impl<T...>::type;
80
81} // namespace mp11
82} // namespace boost
83
84#endif // #ifndef BOOST_MP11_DETAIL_MP_PLUS_HPP_INCLUDED
85