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
|
/*!
@file
Defines `boost::hana::Foldable`.
Copyright Louis Dionne 2013-2022
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_CONCEPT_FOLDABLE_HPP
#define BOOST_HANA_CONCEPT_FOLDABLE_HPP
#include <boost/hana/fwd/concept/foldable.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/default.hpp>
#include <boost/hana/core/tag_of.hpp>
#include <boost/hana/detail/integral_constant.hpp>
#include <boost/hana/fold_left.hpp>
#include <boost/hana/unpack.hpp>
namespace boost { namespace hana {
template <typename T>
struct Foldable
: hana::integral_constant<bool,
!is_default<fold_left_impl<typename tag_of<T>::type>>::value ||
!is_default<unpack_impl<typename tag_of<T>::type>>::value
>
{ };
}} // end namespace boost::hana
#endif // !BOOST_HANA_CONCEPT_FOLDABLE_HPP
|
