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57b08b0944
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. llvm-svn: 351648
109 lines
3.7 KiB
C++
109 lines
3.7 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
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// <tuple>
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// template <class... Types> class tuple;
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// template <class Alloc>
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// tuple(allocator_arg_t, const Alloc& a);
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// NOTE: this constructor does not currently support tags derived from
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// allocator_arg_t because libc++ has to deduce the parameter as a template
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// argument. See PR27684 (https://bugs.llvm.org/show_bug.cgi?id=27684)
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#include <tuple>
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#include <cassert>
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#include "DefaultOnly.h"
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#include "allocators.h"
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#include "../alloc_first.h"
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#include "../alloc_last.h"
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template <class T = void>
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struct NonDefaultConstructible {
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constexpr NonDefaultConstructible() {
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static_assert(!std::is_same<T, T>::value, "Default Ctor instantiated");
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}
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explicit constexpr NonDefaultConstructible(int) {}
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};
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struct DerivedFromAllocArgT : std::allocator_arg_t {};
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int main()
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{
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{
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std::tuple<> t(std::allocator_arg, A1<int>());
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}
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{
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std::tuple<int> t(std::allocator_arg, A1<int>());
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assert(std::get<0>(t) == 0);
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}
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{
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std::tuple<DefaultOnly> t(std::allocator_arg, A1<int>());
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assert(std::get<0>(t) == DefaultOnly());
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}
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{
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assert(!alloc_first::allocator_constructed);
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std::tuple<alloc_first> t(std::allocator_arg, A1<int>(5));
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assert(alloc_first::allocator_constructed);
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assert(std::get<0>(t) == alloc_first());
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}
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{
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assert(!alloc_last::allocator_constructed);
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std::tuple<alloc_last> t(std::allocator_arg, A1<int>(5));
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assert(alloc_last::allocator_constructed);
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assert(std::get<0>(t) == alloc_last());
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}
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{
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alloc_first::allocator_constructed = false;
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std::tuple<DefaultOnly, alloc_first> t(std::allocator_arg, A1<int>(5));
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assert(std::get<0>(t) == DefaultOnly());
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assert(alloc_first::allocator_constructed);
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assert(std::get<1>(t) == alloc_first());
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}
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{
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alloc_first::allocator_constructed = false;
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alloc_last::allocator_constructed = false;
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std::tuple<DefaultOnly, alloc_first, alloc_last> t(std::allocator_arg,
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A1<int>(5));
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assert(std::get<0>(t) == DefaultOnly());
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assert(alloc_first::allocator_constructed);
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assert(std::get<1>(t) == alloc_first());
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assert(alloc_last::allocator_constructed);
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assert(std::get<2>(t) == alloc_last());
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}
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{
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alloc_first::allocator_constructed = false;
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alloc_last::allocator_constructed = false;
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std::tuple<DefaultOnly, alloc_first, alloc_last> t(std::allocator_arg,
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A2<int>(5));
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assert(std::get<0>(t) == DefaultOnly());
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assert(!alloc_first::allocator_constructed);
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assert(std::get<1>(t) == alloc_first());
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assert(!alloc_last::allocator_constructed);
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assert(std::get<2>(t) == alloc_last());
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}
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{
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// Test that the uses-allocator default constructor does not evaluate
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// its SFINAE when it otherwise shouldn't be selected. Do this by
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// using 'NonDefaultConstructible' which will cause a compile error
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// if std::is_default_constructible is evaluated on it.
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using T = NonDefaultConstructible<>;
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T v(42);
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std::tuple<T, T> t(v, v);
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(void)t;
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std::tuple<T, T> t2(42, 42);
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(void)t2;
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}
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}
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