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
|
/*!
@file
Defines operators for Orderables.
@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_ORDERABLE_HPP
#define BOOST_HANA_DETAIL_OPERATORS_ORDERABLE_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/tag_of.hpp>
#include <boost/hana/fwd/greater.hpp>
#include <boost/hana/fwd/greater_equal.hpp>
#include <boost/hana/fwd/less.hpp>
#include <boost/hana/fwd/less_equal.hpp>
#include <type_traits>
BOOST_HANA_NAMESPACE_BEGIN namespace detail {
template <typename Tag>
struct orderable_operators {
static constexpr bool value = false;
};
namespace operators {
template <typename X, typename Y, typename = typename std::enable_if<
detail::orderable_operators<typename hana::tag_of<X>::type>::value ||
detail::orderable_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator<(X&& x, Y&& y)
{ return hana::less(static_cast<X&&>(x), static_cast<Y&&>(y)); }
template <typename X, typename Y, typename = typename std::enable_if<
detail::orderable_operators<typename hana::tag_of<X>::type>::value ||
detail::orderable_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator>(X&& x, Y&& y)
{ return hana::greater(static_cast<X&&>(x), static_cast<Y&&>(y)); }
template <typename X, typename Y, typename = typename std::enable_if<
detail::orderable_operators<typename hana::tag_of<X>::type>::value ||
detail::orderable_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator<=(X&& x, Y&& y)
{ return hana::less_equal(static_cast<X&&>(x), static_cast<Y&&>(y)); }
template <typename X, typename Y, typename = typename std::enable_if<
detail::orderable_operators<typename hana::tag_of<X>::type>::value ||
detail::orderable_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator>=(X&& x, Y&& y)
{ return hana::greater_equal(static_cast<X&&>(x), static_cast<Y&&>(y)); }
} // end namespace operators
} BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_DETAIL_OPERATORS_ORDERABLE_HPP
|
