| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03 |
| |
| // <tuple> |
| |
| // template <class... Types> class tuple; |
| |
| // template <class Alloc> |
| // tuple(allocator_arg_t, const Alloc& a); |
| |
| // NOTE: this constructor does not currently support tags derived from |
| // allocator_arg_t because libc++ has to deduce the parameter as a template |
| // argument. See PR27684 (https://llvm.org/bugs/show_bug.cgi?id=27684) |
| |
| #include <tuple> |
| #include <cassert> |
| |
| #include "DefaultOnly.h" |
| #include "allocators.h" |
| #include "../alloc_first.h" |
| #include "../alloc_last.h" |
| |
| template <class T = void> |
| struct NonDefaultConstructible { |
| constexpr NonDefaultConstructible() { |
| static_assert(!std::is_same<T, T>::value, "Default Ctor instantiated"); |
| } |
| |
| explicit constexpr NonDefaultConstructible(int) {} |
| }; |
| |
| |
| struct DerivedFromAllocArgT : std::allocator_arg_t {}; |
| |
| int main() |
| { |
| { |
| std::tuple<> t(std::allocator_arg, A1<int>()); |
| } |
| { |
| std::tuple<int> t(std::allocator_arg, A1<int>()); |
| assert(std::get<0>(t) == 0); |
| } |
| { |
| std::tuple<DefaultOnly> t(std::allocator_arg, A1<int>()); |
| assert(std::get<0>(t) == DefaultOnly()); |
| } |
| { |
| assert(!alloc_first::allocator_constructed); |
| std::tuple<alloc_first> t(std::allocator_arg, A1<int>(5)); |
| assert(alloc_first::allocator_constructed); |
| assert(std::get<0>(t) == alloc_first()); |
| } |
| { |
| assert(!alloc_last::allocator_constructed); |
| std::tuple<alloc_last> t(std::allocator_arg, A1<int>(5)); |
| assert(alloc_last::allocator_constructed); |
| assert(std::get<0>(t) == alloc_last()); |
| } |
| { |
| alloc_first::allocator_constructed = false; |
| std::tuple<DefaultOnly, alloc_first> t(std::allocator_arg, A1<int>(5)); |
| assert(std::get<0>(t) == DefaultOnly()); |
| assert(alloc_first::allocator_constructed); |
| assert(std::get<1>(t) == alloc_first()); |
| } |
| { |
| alloc_first::allocator_constructed = false; |
| alloc_last::allocator_constructed = false; |
| std::tuple<DefaultOnly, alloc_first, alloc_last> t(std::allocator_arg, |
| A1<int>(5)); |
| assert(std::get<0>(t) == DefaultOnly()); |
| assert(alloc_first::allocator_constructed); |
| assert(std::get<1>(t) == alloc_first()); |
| assert(alloc_last::allocator_constructed); |
| assert(std::get<2>(t) == alloc_last()); |
| } |
| { |
| alloc_first::allocator_constructed = false; |
| alloc_last::allocator_constructed = false; |
| std::tuple<DefaultOnly, alloc_first, alloc_last> t(std::allocator_arg, |
| A2<int>(5)); |
| assert(std::get<0>(t) == DefaultOnly()); |
| assert(!alloc_first::allocator_constructed); |
| assert(std::get<1>(t) == alloc_first()); |
| assert(!alloc_last::allocator_constructed); |
| assert(std::get<2>(t) == alloc_last()); |
| } |
| { |
| // Test that the uses-allocator default constructor does not evaluate |
| // it's SFINAE when it otherwise shouldn't be selected. Do this by |
| // using 'NonDefaultConstructible' which will cause a compile error |
| // if std::is_default_constructible is evaluated on it. |
| using T = NonDefaultConstructible<>; |
| T v(42); |
| std::tuple<T, T> t(v, v); |
| std::tuple<T, T> t2(42, 42); |
| } |
| } |