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
|
/*!
@file
Defines `boost::hana::mod`.
@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_MOD_HPP
#define BOOST_HANA_MOD_HPP
#include <boost/hana/fwd/mod.hpp>
#include <boost/hana/concept/constant.hpp>
#include <boost/hana/concept/euclidean_ring.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/to.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/detail/canonical_constant.hpp>
#include <boost/hana/detail/has_common_embedding.hpp>
#include <boost/hana/value.hpp>
#include <type_traits>
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template <typename X, typename Y>
constexpr decltype(auto) mod_t::operator()(X&& x, Y&& y) const {
using T = typename hana::tag_of<X>::type;
using U = typename hana::tag_of<Y>::type;
using Mod = BOOST_HANA_DISPATCH_IF(decltype(mod_impl<T, U>{}),
hana::EuclideanRing<T>::value &&
hana::EuclideanRing<U>::value &&
!is_default<mod_impl<T, U>>::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::EuclideanRing<T>::value,
"hana::mod(x, y) requires 'x' to be an EuclideanRing");
static_assert(hana::EuclideanRing<U>::value,
"hana::mod(x, y) requires 'y' to be an EuclideanRing");
static_assert(!is_default<mod_impl<T, U>>::value,
"hana::mod(x, y) requires 'x' and 'y' to be embeddable "
"in a common EuclideanRing");
#endif
return Mod::apply(static_cast<X&&>(x), static_cast<Y&&>(y));
}
//! @endcond
template <typename T, typename U, bool condition>
struct mod_impl<T, U, when<condition>> : default_ {
template <typename ...Args>
static constexpr auto apply(Args&& ...) = delete;
};
// Cross-type overload
template <typename T, typename U>
struct mod_impl<T, U, when<
detail::has_nontrivial_common_embedding<EuclideanRing, T, U>::value
>> {
using C = typename common<T, U>::type;
template <typename X, typename Y>
static constexpr decltype(auto) apply(X&& x, Y&& y) {
return hana::mod(hana::to<C>(static_cast<X&&>(x)),
hana::to<C>(static_cast<Y&&>(y)));
}
};
//////////////////////////////////////////////////////////////////////////
// Model for integral data types
//////////////////////////////////////////////////////////////////////////
template <typename T>
struct mod_impl<T, T, when<std::is_integral<T>::value &&
!std::is_same<T, bool>::value>> {
template <typename X, typename Y>
static constexpr decltype(auto) apply(X&& x, Y&& y)
{ return static_cast<X&&>(x) % static_cast<Y&&>(y); }
};
//////////////////////////////////////////////////////////////////////////
// Model for Constants over an EuclideanRing
//////////////////////////////////////////////////////////////////////////
namespace detail {
template <typename C, typename X, typename Y>
struct constant_from_mod {
static constexpr auto value = hana::mod(hana::value<X>(), hana::value<Y>());
using hana_tag = detail::CanonicalConstant<typename C::value_type>;
};
}
template <typename C>
struct mod_impl<C, C, when<
hana::Constant<C>::value &&
EuclideanRing<typename C::value_type>::value
>> {
template <typename X, typename Y>
static constexpr decltype(auto) apply(X const&, Y const&)
{ return hana::to<C>(detail::constant_from_mod<C, X, Y>{}); }
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_MOD_HPP
|
