90fb2baff7
Summary: A default uses-allocator constructor has been added since that overload was previously provided by the extended constructor. Since Clang does implicit conversion checking after substitution this constructor has to deduce the allocator_arg_t parameter so that it can prevent the evaluation of "is_default_constructible" if the first argument doesn't match. See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1391 for more information. This patch fixes PR24779 (https://llvm.org/bugs/show_bug.cgi?id=24779) Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D19006 llvm-svn: 266409
123 lines
4.1 KiB
C++
123 lines
4.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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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// UNSUPPORTED: c++98, c++03
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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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DerivedFromAllocArgT tag;
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std::tuple<> t(tag, 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 allocator construction is selected when the user provides
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// a custom tag type which derives from allocator_arg_t.
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DerivedFromAllocArgT tag;
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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(tag, 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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// Test that the uses-allocator default constructor does not evaluate
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// it's 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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std::tuple<T, T> t2(42, 42);
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}
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}
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