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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2025
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/common.h"
#include <functional>
#include <tuple>
#include <type_traits>
#include <utility>
namespace td {
namespace detail {
template <std::size_t... S>
struct IntSeq {};
template <std::size_t L, std::size_t N, std::size_t... S>
struct IntSeqGen : IntSeqGen<L, N - 1, L + N - 1, S...> {};
template <std::size_t L, std::size_t... S>
struct IntSeqGen<L, 0, S...> {
using type = IntSeq<S...>;
};
template <bool... Args>
class LogicAndImpl {};
template <bool Res, bool X, bool... Args>
class LogicAndImpl<Res, X, Args...> {
public:
static constexpr bool value = LogicAndImpl<(Res && X), Args...>::value;
};
template <bool Res>
class LogicAndImpl<Res> {
public:
static constexpr bool value = Res;
};
template <std::size_t N>
using IntRange = typename IntSeqGen<0, N>::type;
template <class T>
struct is_reference_wrapper : std::false_type {};
template <class U>
struct is_reference_wrapper<std::reference_wrapper<U>> : std::true_type {};
template <class Base, class T, class Derived, class... Args>
auto invoke_impl(T Base::*pmf, Derived &&ref,
Args &&...args) noexcept(noexcept((std::forward<Derived>(ref).*pmf)(std::forward<Args>(args)...)))
-> std::enable_if_t<std::is_function<T>::value && std::is_base_of<Base, std::decay<Derived>>::value,
decltype((std::forward<Derived>(ref).*pmf)(std::forward<Args>(args)...))> {
return (std::forward<Derived>(ref).*pmf)(std::forward<Args>(args)...);
}
template <class Base, class T, class RefWrap, class... Args>
auto invoke_impl(T Base::*pmf, RefWrap &&ref,
Args &&...args) noexcept(noexcept((ref.get().*pmf)(std::forward<Args>(args)...)))
-> std::enable_if_t<std::is_function<T>::value && is_reference_wrapper<std::decay_t<RefWrap>>::value,
decltype((ref.get().*pmf)(std::forward<Args>(args)...))>
{
return (ref.get().*pmf)(std::forward<Args>(args)...);
}
template <class Base, class T, class Pointer, class... Args>
auto invoke_impl(T Base::*pmf, Pointer &&ptr,
Args &&...args) noexcept(noexcept(((*std::forward<Pointer>(ptr)).*pmf)(std::forward<Args>(args)...)))
-> std::enable_if_t<std::is_function<T>::value && !is_reference_wrapper<std::decay_t<Pointer>>::value &&
!std::is_base_of<Base, std::decay_t<Pointer>>::value,
decltype(((*std::forward<Pointer>(ptr)).*pmf)(std::forward<Args>(args)...))> {
return ((*std::forward<Pointer>(ptr)).*pmf)(std::forward<Args>(args)...);
}
template <class Base, class T, class Derived>
auto invoke_impl(T Base::*pmd, Derived &&ref) noexcept(noexcept(std::forward<Derived>(ref).*pmd))
-> std::enable_if_t<!std::is_function<T>::value && std::is_base_of<Base, std::decay_t<Derived>>::value,
decltype(std::forward<Derived>(ref).*pmd)> {
return std::forward<Derived>(ref).*pmd;
}
template <class Base, class T, class RefWrap>
auto invoke_impl(T Base::*pmd, RefWrap &&ref) noexcept(noexcept(ref.get().*pmd))
-> std::enable_if_t<!std::is_function<T>::value && is_reference_wrapper<std::decay_t<RefWrap>>::value,
decltype(ref.get().*pmd)> {
return ref.get().*pmd;
}
template <class Base, class T, class Pointer>
auto invoke_impl(T Base::*pmd, Pointer &&ptr) noexcept(noexcept((*std::forward<Pointer>(ptr)).*pmd))
-> std::enable_if_t<!std::is_function<T>::value && !is_reference_wrapper<std::decay_t<Pointer>>::value &&
!std::is_base_of<Base, std::decay_t<Pointer>>::value,
decltype((*std::forward<Pointer>(ptr)).*pmd)> {
return (*std::forward<Pointer>(ptr)).*pmd;
}
template <class F, class... Args>
auto invoke_impl(F &&f, Args &&...args) noexcept(noexcept(std::forward<F>(f)(std::forward<Args>(args)...)))
-> std::enable_if_t<!std::is_member_pointer<std::decay_t<F>>::value,
decltype(std::forward<F>(f)(std::forward<Args>(args)...))> {
return std::forward<F>(f)(std::forward<Args>(args)...);
}
template <class F, class... ArgTypes>
auto invoke(F &&f,
ArgTypes &&...args) noexcept(noexcept(invoke_impl(std::forward<F>(f), std::forward<ArgTypes>(args)...)))
-> decltype(invoke_impl(std::forward<F>(f), std::forward<ArgTypes>(args)...)) {
return invoke_impl(std::forward<F>(f), std::forward<ArgTypes>(args)...);
}
template <class F, class... Args, std::size_t... S>
auto call_tuple_impl(F &&func, std::tuple<Args...> &&tuple, IntSeq<S...>) {
return func(std::forward<Args>(std::get<S>(tuple))...);
}
template <class... Args, std::size_t... S>
auto invoke_tuple_impl(std::tuple<Args...> &&tuple, IntSeq<S...>) {
return invoke(std::forward<Args>(std::get<S>(tuple))...);
}
template <class ActorT, class F, class... Args, std::size_t... S>
auto mem_call_tuple_impl(ActorT *actor, std::tuple<F, Args...> &&tuple, IntSeq<0, S...>) {
return (actor->*std::get<0>(tuple))(std::forward<Args>(std::get<S>(tuple))...);
}
template <class F, class... Args, std::size_t... S>
void tuple_for_each_impl(std::tuple<Args...> &tuple, const F &func, IntSeq<S...>) {
const auto &dummy = {0, (func(std::get<S>(tuple)), 0)...};
(void)dummy;
}
template <class F, class... Args, std::size_t... S>
void tuple_for_each_impl(const std::tuple<Args...> &tuple, const F &func, IntSeq<S...>) {
const auto &dummy = {0, (func(std::get<S>(tuple)), 0)...};
(void)dummy;
}
} // namespace detail
template <bool... Args>
class LogicAnd {
public:
static constexpr bool value = detail::LogicAndImpl<true, Args...>::value;
};
template <class F, class... Args>
auto call_tuple(F &&func, std::tuple<Args...> &&tuple) {
return detail::call_tuple_impl(func, std::move(tuple), detail::IntRange<sizeof...(Args)>());
}
template <class... Args>
auto invoke_tuple(std::tuple<Args...> &&tuple) {
return detail::invoke_tuple_impl(std::move(tuple), detail::IntRange<sizeof...(Args)>());
}
template <class ActorT, class... Args>
auto mem_call_tuple(ActorT *actor, std::tuple<Args...> &&tuple) {
return detail::mem_call_tuple_impl(actor, std::move(tuple), detail::IntRange<sizeof...(Args)>());
}
template <class F, class... Args>
void tuple_for_each(std::tuple<Args...> &tuple, const F &func) {
detail::tuple_for_each_impl(tuple, func, detail::IntRange<sizeof...(Args)>());
}
template <class F, class... Args>
void tuple_for_each(const std::tuple<Args...> &tuple, const F &func) {
detail::tuple_for_each_impl(tuple, func, detail::IntRange<sizeof...(Args)>());
}
template <size_t N, class Arg, class... Args, std::enable_if_t<N == 0, int> = 0>
auto &&get_nth_argument(Arg &&arg, Args &&...args) {
return std::forward<Arg>(arg);
}
template <size_t N, class Arg, class... Args, std::enable_if_t<N != 0, int> = 0>
auto &&get_nth_argument(Arg &&arg, Args &&...args) {
return get_nth_argument<N - 1>(std::forward<Args &&>(args)...);
}
template <class... Args>
auto &&get_last_argument(Args &&...args) {
return get_nth_argument<sizeof...(Args) - 1>(std::forward<Args &&>(args)...);
}
namespace detail {
template <class F, class... Args, std::size_t... S>
auto call_n_arguments_impl(IntSeq<S...>, F &&f, Args &&...args) {
return f(get_nth_argument<S>(std::forward<Args>(args)...)...);
}
} // namespace detail
template <size_t N, class F, class... Args>
auto call_n_arguments(F &&f, Args &&...args) {
return detail::call_n_arguments_impl(detail::IntRange<N>(), f, std::forward<Args>(args)...);
}
template <class F, class X, class = void>
struct is_callable final : public std::false_type {};
template <class F, class X>
struct is_callable<F, X, decltype(std::declval<F>()(std::declval<X>()))> final : public std::true_type {};
} // namespace td
|
