tg2sip/libtgvoip/webrtc_dsp/absl/utility/utility.h

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Squashed 'libtgvoip/' changes from 6053cf5..cfd62e6 cfd62e6 Why did it change the OS X project 3a58a16 2.4.3 c4a48b3 Updated OS X project 564eada Fix #63 4f64e2e fixes 0c732e2 fixes 12e76ed better logging f015b79 Merge pull request #62 from xvitaly/big-endian a1df90f Set preferred audio session parameters on iOS 59a975b Fixes 8fd89fc Fixes, mic level testing and volume adjustment 243acfa Backported WebRTC upstream patch with Big Endian support. fed3bb7 Detect when proxy does not support UDP and persist that across calls a7546d4 Merge commit '6d03dd9ae4bf48d7344341cdd2d055ebd3a6a42e' into public 6d03dd9 version 69adf70 Use server config for APM + iOS crash fix 0b42ec8 Update iOS project f1b9e63 packet logging beeea45 I apparently still suck at C++ memory management 24fceba Update project 7f54b91 crash fix f85ce99 Save more data in data saving mode f4c4f79 Collect packet stats and accept json string for server config 78e584c New protocol version: optimized packet size 8cf9177 Fixed build on iOS 9dd089d fixed build on android 5caaaaf Updated WebRTC APM cc0cf35 fixed deadlock 02f4835 Rearranged VoIPController methods and added sections 912f73d Updated OS X project 39376df Fixed audio glitches on Windows dfe1f03 Updated project 81daf3f fix 296187a Merge pull request #58 from telegramdesktop/tdesktop 44956ac Merge pull request #57 from UnigramDev/public fb0a2b0 Fix build for Linux. d6cf1b7 Updated UWP wrapper 0f06289 Merge branch 'public' of github.com:grishka/libtgvoip into public dcfad91 Fix #54 162f447 Merge pull request #56 from telegramdesktop/tdesktop a7ee511 Merge remote-tracking branch 'origin/tdesktop' into HEAD 467b148 Removed unused files b1a0b3d 2.3 9b292fd Fix warning in Xcode 10. 8d8522a Merge pull request #53 from UnigramDev/public 646f7d6 Merge branch 'public' into public 14d782b Fixes 68acf59 Added GetSignalBarsCount and GetConnectionState to CXWrapper 761c586 Added GetStats to CXWrapper f643b02 Prevent crash if UWP WASAPI devices aren't found b2ac10e Fixed UWP project 9a1ec51 Fixed build for Windows Phone, fixed some warnings 4aea54f fix git-subtree-dir: libtgvoip git-subtree-split: cfd62e66a825348ac51f49e5d20bf8827fef7a38
2019-02-06 18:22:38 +00:00
// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This header file contains C++11 versions of standard <utility> header
// abstractions available within C++14 and C++17, and are designed to be drop-in
// replacement for code compliant with C++14 and C++17.
//
// The following abstractions are defined:
//
// * integer_sequence<T, Ints...> == std::integer_sequence<T, Ints...>
// * index_sequence<Ints...> == std::index_sequence<Ints...>
// * make_integer_sequence<T, N> == std::make_integer_sequence<T, N>
// * make_index_sequence<N> == std::make_index_sequence<N>
// * index_sequence_for<Ts...> == std::index_sequence_for<Ts...>
// * apply<Functor, Tuple> == std::apply<Functor, Tuple>
// * exchange<T> == std::exchange<T>
//
// This header file also provides the tag types `in_place_t`, `in_place_type_t`,
// and `in_place_index_t`, as well as the constant `in_place`, and
// `constexpr` `std::move()` and `std::forward()` implementations in C++11.
//
// References:
//
// http://en.cppreference.com/w/cpp/utility/integer_sequence
// http://en.cppreference.com/w/cpp/utility/apply
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3658.html
//
#ifndef ABSL_UTILITY_UTILITY_H_
#define ABSL_UTILITY_UTILITY_H_
#include <cstddef>
#include <cstdlib>
#include <tuple>
#include <utility>
#include "absl/base/config.h"
#include "absl/base/internal/inline_variable.h"
#include "absl/base/internal/invoke.h"
#include "absl/meta/type_traits.h"
namespace absl {
// integer_sequence
//
// Class template representing a compile-time integer sequence. An instantiation
// of `integer_sequence<T, Ints...>` has a sequence of integers encoded in its
// type through its template arguments (which is a common need when
// working with C++11 variadic templates). `absl::integer_sequence` is designed
// to be a drop-in replacement for C++14's `std::integer_sequence`.
//
// Example:
//
// template< class T, T... Ints >
// void user_function(integer_sequence<T, Ints...>);
//
// int main()
// {
// // user_function's `T` will be deduced to `int` and `Ints...`
// // will be deduced to `0, 1, 2, 3, 4`.
// user_function(make_integer_sequence<int, 5>());
// }
template <typename T, T... Ints>
struct integer_sequence {
using value_type = T;
static constexpr size_t size() noexcept { return sizeof...(Ints); }
};
// index_sequence
//
// A helper template for an `integer_sequence` of `size_t`,
// `absl::index_sequence` is designed to be a drop-in replacement for C++14's
// `std::index_sequence`.
template <size_t... Ints>
using index_sequence = integer_sequence<size_t, Ints...>;
namespace utility_internal {
template <typename Seq, size_t SeqSize, size_t Rem>
struct Extend;
// Note that SeqSize == sizeof...(Ints). It's passed explicitly for efficiency.
template <typename T, T... Ints, size_t SeqSize>
struct Extend<integer_sequence<T, Ints...>, SeqSize, 0> {
using type = integer_sequence<T, Ints..., (Ints + SeqSize)...>;
};
template <typename T, T... Ints, size_t SeqSize>
struct Extend<integer_sequence<T, Ints...>, SeqSize, 1> {
using type = integer_sequence<T, Ints..., (Ints + SeqSize)..., 2 * SeqSize>;
};
// Recursion helper for 'make_integer_sequence<T, N>'.
// 'Gen<T, N>::type' is an alias for 'integer_sequence<T, 0, 1, ... N-1>'.
template <typename T, size_t N>
struct Gen {
using type =
typename Extend<typename Gen<T, N / 2>::type, N / 2, N % 2>::type;
};
template <typename T>
struct Gen<T, 0> {
using type = integer_sequence<T>;
};
} // namespace utility_internal
// Compile-time sequences of integers
// make_integer_sequence
//
// This template alias is equivalent to
// `integer_sequence<int, 0, 1, ..., N-1>`, and is designed to be a drop-in
// replacement for C++14's `std::make_integer_sequence`.
template <typename T, T N>
using make_integer_sequence = typename utility_internal::Gen<T, N>::type;
// make_index_sequence
//
// This template alias is equivalent to `index_sequence<0, 1, ..., N-1>`,
// and is designed to be a drop-in replacement for C++14's
// `std::make_index_sequence`.
template <size_t N>
using make_index_sequence = make_integer_sequence<size_t, N>;
// index_sequence_for
//
// Converts a typename pack into an index sequence of the same length, and
// is designed to be a drop-in replacement for C++14's
// `std::index_sequence_for()`
template <typename... Ts>
using index_sequence_for = make_index_sequence<sizeof...(Ts)>;
// Tag types
#ifdef ABSL_HAVE_STD_OPTIONAL
using std::in_place_t;
using std::in_place;
#else // ABSL_HAVE_STD_OPTIONAL
// in_place_t
//
// Tag type used to specify in-place construction, such as with
// `absl::optional`, designed to be a drop-in replacement for C++17's
// `std::in_place_t`.
struct in_place_t {};
ABSL_INTERNAL_INLINE_CONSTEXPR(in_place_t, in_place, {});
#endif // ABSL_HAVE_STD_OPTIONAL
#if defined(ABSL_HAVE_STD_ANY) || defined(ABSL_HAVE_STD_VARIANT)
using std::in_place_type_t;
#else
// in_place_type_t
//
// Tag type used for in-place construction when the type to construct needs to
// be specified, such as with `absl::any`, designed to be a drop-in replacement
// for C++17's `std::in_place_type_t`.
template <typename T>
struct in_place_type_t {};
#endif // ABSL_HAVE_STD_ANY || ABSL_HAVE_STD_VARIANT
#ifdef ABSL_HAVE_STD_VARIANT
using std::in_place_index_t;
#else
// in_place_index_t
//
// Tag type used for in-place construction when the type to construct needs to
// be specified, such as with `absl::any`, designed to be a drop-in replacement
// for C++17's `std::in_place_index_t`.
template <size_t I>
struct in_place_index_t {};
#endif // ABSL_HAVE_STD_VARIANT
// Constexpr move and forward
// move()
//
// A constexpr version of `std::move()`, designed to be a drop-in replacement
// for C++14's `std::move()`.
template <typename T>
constexpr absl::remove_reference_t<T>&& move(T&& t) noexcept {
return static_cast<absl::remove_reference_t<T>&&>(t);
}
// forward()
//
// A constexpr version of `std::forward()`, designed to be a drop-in replacement
// for C++14's `std::forward()`.
template <typename T>
constexpr T&& forward(
absl::remove_reference_t<T>& t) noexcept { // NOLINT(runtime/references)
return static_cast<T&&>(t);
}
namespace utility_internal {
// Helper method for expanding tuple into a called method.
template <typename Functor, typename Tuple, std::size_t... Indexes>
auto apply_helper(Functor&& functor, Tuple&& t, index_sequence<Indexes...>)
-> decltype(absl::base_internal::Invoke(
absl::forward<Functor>(functor),
std::get<Indexes>(absl::forward<Tuple>(t))...)) {
return absl::base_internal::Invoke(
absl::forward<Functor>(functor),
std::get<Indexes>(absl::forward<Tuple>(t))...);
}
} // namespace utility_internal
// apply
//
// Invokes a Callable using elements of a tuple as its arguments.
// Each element of the tuple corresponds to an argument of the call (in order).
// Both the Callable argument and the tuple argument are perfect-forwarded.
// For member-function Callables, the first tuple element acts as the `this`
// pointer. `absl::apply` is designed to be a drop-in replacement for C++17's
// `std::apply`. Unlike C++17's `std::apply`, this is not currently `constexpr`.
//
// Example:
//
// class Foo{void Bar(int);};
// void user_function(int, string);
// void user_function(std::unique_ptr<Foo>);
//
// int main()
// {
// std::tuple<int, string> tuple1(42, "bar");
// // Invokes the user function overload on int, string.
// absl::apply(&user_function, tuple1);
//
// auto foo = absl::make_unique<Foo>();
// std::tuple<Foo*, int> tuple2(foo.get(), 42);
// // Invokes the method Bar on foo with one argument 42.
// absl::apply(&Foo::Bar, foo.get(), 42);
//
// std::tuple<std::unique_ptr<Foo>> tuple3(absl::make_unique<Foo>());
// // Invokes the user function that takes ownership of the unique
// // pointer.
// absl::apply(&user_function, std::move(tuple));
// }
template <typename Functor, typename Tuple>
auto apply(Functor&& functor, Tuple&& t)
-> decltype(utility_internal::apply_helper(
absl::forward<Functor>(functor), absl::forward<Tuple>(t),
absl::make_index_sequence<std::tuple_size<
typename std::remove_reference<Tuple>::type>::value>{})) {
return utility_internal::apply_helper(
absl::forward<Functor>(functor), absl::forward<Tuple>(t),
absl::make_index_sequence<std::tuple_size<
typename std::remove_reference<Tuple>::type>::value>{});
}
// exchange
//
// Replaces the value of `obj` with `new_value` and returns the old value of
// `obj`. `absl::exchange` is designed to be a drop-in replacement for C++14's
// `std::exchange`.
//
// Example:
//
// Foo& operator=(Foo&& other) {
// ptr1_ = absl::exchange(other.ptr1_, nullptr);
// int1_ = absl::exchange(other.int1_, -1);
// return *this;
// }
template <typename T, typename U = T>
T exchange(T& obj, U&& new_value) {
T old_value = absl::move(obj);
obj = absl::forward<U>(new_value);
return old_value;
}
} // namespace absl
#endif // ABSL_UTILITY_UTILITY_H_