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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
144 lines
3.6 KiB
C++
144 lines
3.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <tuple>
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// template <class F, class T> constexpr decltype(auto) apply(F &&, T &&)
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// Stress testing large arities with tuple and array.
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#include <tuple>
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#include <array>
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#include <utility>
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#include <cassert>
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////////////////////////////////////////////////////////////////////////////////
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template <class T, std::size_t Dummy = 0>
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struct always_imp
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{
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typedef T type;
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};
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template <class T, std::size_t Dummy = 0>
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using always_t = typename always_imp<T, Dummy>::type;
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////////////////////////////////////////////////////////////////////////////////
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template <class Tuple, class Idx>
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struct make_function;
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template <class Tp, std::size_t ...Idx>
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struct make_function<Tp, std::integer_sequence<std::size_t, Idx...>>
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{
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using type = bool (*)(always_t<Tp, Idx>...);
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};
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template <class Tp, std::size_t Size>
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using make_function_t = typename make_function<Tp, std::make_index_sequence<Size>>::type;
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////////////////////////////////////////////////////////////////////////////////
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template <class Tp, class Idx>
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struct make_tuple_imp;
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////////////////////////////////////////////////////////////////////////////////
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template <class Tp, std::size_t ...Idx>
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struct make_tuple_imp<Tp, std::integer_sequence<std::size_t, Idx...>>
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{
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using type = std::tuple<always_t<Tp, Idx>...>;
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};
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template <class Tp, std::size_t Size>
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using make_tuple_t = typename make_tuple_imp<Tp, std::make_index_sequence<Size>>::type;
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template <class ...Types>
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bool test_apply_fn(Types...) { return true; }
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template <std::size_t Size>
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void test_all()
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{
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using A = std::array<int, Size>;
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using ConstA = std::array<int const, Size>;
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using Tuple = make_tuple_t<int, Size>;
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using CTuple = make_tuple_t<const int, Size>;
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using ValFn = make_function_t<int, Size>;
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ValFn val_fn = &test_apply_fn;
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using RefFn = make_function_t<int &, Size>;
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RefFn ref_fn = &test_apply_fn;
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using CRefFn = make_function_t<int const &, Size>;
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CRefFn cref_fn = &test_apply_fn;
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using RRefFn = make_function_t<int &&, Size>;
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RRefFn rref_fn = &test_apply_fn;
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{
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A a{};
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assert(std::apply(val_fn, a));
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assert(std::apply(ref_fn, a));
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assert(std::apply(cref_fn, a));
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assert(std::apply(rref_fn, std::move(a)));
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}
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{
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ConstA a{};
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assert(std::apply(val_fn, a));
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assert(std::apply(cref_fn, a));
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}
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{
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Tuple a{};
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assert(std::apply(val_fn, a));
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assert(std::apply(ref_fn, a));
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assert(std::apply(cref_fn, a));
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assert(std::apply(rref_fn, std::move(a)));
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}
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{
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CTuple a{};
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assert(std::apply(val_fn, a));
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assert(std::apply(cref_fn, a));
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}
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}
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template <std::size_t Size>
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void test_one()
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{
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using A = std::array<int, Size>;
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using Tuple = make_tuple_t<int, Size>;
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using ValFn = make_function_t<int, Size>;
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ValFn val_fn = &test_apply_fn;
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{
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A a{};
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assert(std::apply(val_fn, a));
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}
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{
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Tuple a{};
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assert(std::apply(val_fn, a));
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}
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}
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int main()
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{
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// Instantiate with 1-5 arguments.
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test_all<1>();
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test_all<2>();
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test_all<3>();
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test_all<4>();
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test_all<5>();
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// Stress test with 256
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test_one<256>();
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}
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