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//===----------------------------------------------------------------------===//
//
// 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, c++11, c++14
// UNSUPPORTED: libcpp-no-deduction-guides
// 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
// <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 <memory>
#include <cassert>
#include "test_macros.h"
#include "archetypes.hpp"
// Overloads
// using A = Allocator
// using AT = std::allocator_arg_t
// ---------------
// (1) tuple(const Types&...) -> tuple<Types...>
// (2) explicit tuple(const Types&...) -> tuple<Types...>
// (3) tuple(AT, A const&, Types const&...) -> tuple<Types...>
// (4) explicit tuple(AT, A const&, Types const&...) -> tuple<Types...>
// (5) tuple(tuple const& t) -> decltype(t)
// (6) tuple(tuple&& t) -> decltype(t)
// (7) tuple(AT, A const&, tuple const& t) -> decltype(t)
// (8) 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)
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 (3)
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 (4)
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 (5)
using Tup = std::tuple<int, decltype(nullptr)>;
const Tup t(42, nullptr);
std::tuple t1(t);
ASSERT_SAME_TYPE(decltype(t1), Tup);
}
{ // Testing (6)
using Tup = std::tuple<void*, unsigned, char>;
std::tuple t1(Tup(nullptr, 42, 'a'));
ASSERT_SAME_TYPE(decltype(t1), Tup);
}
{ // Testing (7)
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 (8)
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() {
test_primary_template();
test_empty_specialization();
}
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