116 lines
3.8 KiB
C++
116 lines
3.8 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++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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// explicit(see-below) tuple(allocator_arg_t, const Alloc& a);
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#include <tuple>
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#include <cassert>
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#include "test_macros.h"
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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(int, char**)
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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 we can use a tag derived from allocator_arg_t
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struct DerivedFromAllocatorArgT : std::allocator_arg_t { };
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DerivedFromAllocatorArgT derived;
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std::tuple<> t1(derived, A1<int>());
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std::tuple<int> t2(derived, A1<int>());
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std::tuple<int, int> t3(derived, A1<int>());
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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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return 0;
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}
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