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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// UNSUPPORTED: libcpp-no-deduction-guides
// UNSUPPORTED: apple-clang-9
// GCC's implementation of class template deduction is still immature and runs
// into issues with libc++. However GCC accepts this code when compiling
// against libstdc++.
// XFAIL: gcc-5, gcc-6, gcc-7, gcc-8, gcc-9, gcc-10, gcc-11
// <tuple>
// Test that the constructors offered by std::tuple are formulated
// so they're compatible with implicit deduction guides, or if that's not
// possible that they provide explicit guides to make it work.
#include <tuple>
#include <cassert>
#include <functional>
#include <memory>
#include "test_macros.h"
#include "archetypes.h"
// Overloads
// using A = Allocator
// using AT = std::allocator_arg_t
// ---------------
// (1) tuple(const Types&...) -> tuple<Types...>
// (2) tuple(pair<T1, T2>) -> tuple<T1, T2>;
// (3) explicit tuple(const Types&...) -> tuple<Types...>
// (4) tuple(AT, A const&, Types const&...) -> tuple<Types...>
// (5) explicit tuple(AT, A const&, Types const&...) -> tuple<Types...>
// (6) tuple(AT, A, pair<T1, T2>) -> tuple<T1, T2>
// (7) tuple(tuple const& t) -> decltype(t)
// (8) tuple(tuple&& t) -> decltype(t)
// (9) tuple(AT, A const&, tuple const& t) -> decltype(t)
// (10) tuple(AT, A const&, tuple&& t) -> decltype(t)
void test_primary_template()
{
const std::allocator<int> A;
const auto AT = std::allocator_arg;
{ // Testing (1)
int x = 101;
std::tuple t1(42);
ASSERT_SAME_TYPE(decltype(t1), std::tuple<int>);
std::tuple t2(x, 0.0, nullptr);
ASSERT_SAME_TYPE(decltype(t2), std::tuple<int, double, decltype(nullptr)>);
}
{ // Testing (2)
std::pair<int, char> p1(1, 'c');
std::tuple t1(p1);
ASSERT_SAME_TYPE(decltype(t1), std::tuple<int, char>);
std::pair<int, std::tuple<char, long, void*>> p2(1, std::tuple<char, long, void*>('c', 3l, nullptr));
std::tuple t2(p2);
ASSERT_SAME_TYPE(decltype(t2), std::tuple<int, std::tuple<char, long, void*>>);
int i = 3;
std::pair<std::reference_wrapper<int>, char> p3(std::ref(i), 'c');
std::tuple t3(p3);
ASSERT_SAME_TYPE(decltype(t3), std::tuple<std::reference_wrapper<int>, char>);
std::pair<int&, char> p4(i, 'c');
std::tuple t4(p4);
ASSERT_SAME_TYPE(decltype(t4), std::tuple<int&, char>);
std::tuple t5(std::pair<int, char>(1, 'c'));
ASSERT_SAME_TYPE(decltype(t5), std::tuple<int, char>);
}
{ // Testing (3)
using T = ExplicitTestTypes::TestType;
static_assert(!std::is_convertible<T const&, T>::value, "");
std::tuple t1(T{});
ASSERT_SAME_TYPE(decltype(t1), std::tuple<T>);
const T v{};
std::tuple t2(T{}, 101l, v);
ASSERT_SAME_TYPE(decltype(t2), std::tuple<T, long, T>);
}
{ // Testing (4)
int x = 101;
std::tuple t1(AT, A, 42);
ASSERT_SAME_TYPE(decltype(t1), std::tuple<int>);
std::tuple t2(AT, A, 42, 0.0, x);
ASSERT_SAME_TYPE(decltype(t2), std::tuple<int, double, int>);
}
{ // Testing (5)
using T = ExplicitTestTypes::TestType;
static_assert(!std::is_convertible<T const&, T>::value, "");
std::tuple t1(AT, A, T{});
ASSERT_SAME_TYPE(decltype(t1), std::tuple<T>);
const T v{};
std::tuple t2(AT, A, T{}, 101l, v);
ASSERT_SAME_TYPE(decltype(t2), std::tuple<T, long, T>);
}
{ // Testing (6)
std::pair<int, char> p1(1, 'c');
std::tuple t1(AT, A, p1);
ASSERT_SAME_TYPE(decltype(t1), std::tuple<int, char>);
std::pair<int, std::tuple<char, long, void*>> p2(1, std::tuple<char, long, void*>('c', 3l, nullptr));
std::tuple t2(AT, A, p2);
ASSERT_SAME_TYPE(decltype(t2), std::tuple<int, std::tuple<char, long, void*>>);
int i = 3;
std::pair<std::reference_wrapper<int>, char> p3(std::ref(i), 'c');
std::tuple t3(AT, A, p3);
ASSERT_SAME_TYPE(decltype(t3), std::tuple<std::reference_wrapper<int>, char>);
std::pair<int&, char> p4(i, 'c');
std::tuple t4(AT, A, p4);
ASSERT_SAME_TYPE(decltype(t4), std::tuple<int&, char>);
std::tuple t5(AT, A, std::pair<int, char>(1, 'c'));
ASSERT_SAME_TYPE(decltype(t5), std::tuple<int, char>);
}
{ // Testing (7)
using Tup = std::tuple<int, decltype(nullptr)>;
const Tup t(42, nullptr);
std::tuple t1(t);
ASSERT_SAME_TYPE(decltype(t1), Tup);
}
{ // Testing (8)
using Tup = std::tuple<void*, unsigned, char>;
std::tuple t1(Tup(nullptr, 42, 'a'));
ASSERT_SAME_TYPE(decltype(t1), Tup);
}
{ // Testing (9)
using Tup = std::tuple<int, decltype(nullptr)>;
const Tup t(42, nullptr);
std::tuple t1(AT, A, t);
ASSERT_SAME_TYPE(decltype(t1), Tup);
}
{ // Testing (10)
using Tup = std::tuple<void*, unsigned, char>;
std::tuple t1(AT, A, Tup(nullptr, 42, 'a'));
ASSERT_SAME_TYPE(decltype(t1), Tup);
}
}
// Overloads
// using A = Allocator
// using AT = std::allocator_arg_t
// ---------------
// (1) tuple() -> tuple<>
// (2) tuple(AT, A const&) -> tuple<>
// (3) tuple(tuple const&) -> tuple<>
// (4) tuple(tuple&&) -> tuple<>
// (5) tuple(AT, A const&, tuple const&) -> tuple<>
// (6) tuple(AT, A const&, tuple&&) -> tuple<>
void test_empty_specialization()
{
std::allocator<int> A;
const auto AT = std::allocator_arg;
{ // Testing (1)
std::tuple t1{};
ASSERT_SAME_TYPE(decltype(t1), std::tuple<>);
}
{ // Testing (2)
std::tuple t1{AT, A};
ASSERT_SAME_TYPE(decltype(t1), std::tuple<>);
}
{ // Testing (3)
const std::tuple<> t{};
std::tuple t1(t);
ASSERT_SAME_TYPE(decltype(t1), std::tuple<>);
}
{ // Testing (4)
std::tuple t1(std::tuple<>{});
ASSERT_SAME_TYPE(decltype(t1), std::tuple<>);
}
{ // Testing (5)
const std::tuple<> t{};
std::tuple t1(AT, A, t);
ASSERT_SAME_TYPE(decltype(t1), std::tuple<>);
}
{ // Testing (6)
std::tuple t1(AT, A, std::tuple<>{});
ASSERT_SAME_TYPE(decltype(t1), std::tuple<>);
}
}
int main(int, char**) {
test_primary_template();
test_empty_specialization();
return 0;
}
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