blob: ccc421c56a07b9eaefed0e87cb56f6b27ec603de (
plain)
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
|
/*!
@file
Defines operators for Monads.
@copyright Louis Dionne 2013-2017
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_DETAIL_OPERATORS_MONAD_HPP
#define BOOST_HANA_DETAIL_OPERATORS_MONAD_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/tag_of.hpp>
#include <boost/hana/fwd/chain.hpp>
#include <type_traits>
BOOST_HANA_NAMESPACE_BEGIN namespace detail {
template <typename Tag>
struct monad_operators {
static constexpr bool value = false;
};
namespace operators {
template <typename Xs, typename F, typename = typename std::enable_if<
detail::monad_operators<typename hana::tag_of<Xs>::type>::value
>::type>
constexpr auto operator|(Xs&& xs, F&& f)
{ return hana::chain(static_cast<Xs&&>(xs), static_cast<F&&>(f)); }
} // end namespace operators
} BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_DETAIL_OPERATORS_MONAD_HPP
|
