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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
// <variant>
// template <class ...Types> class variant;
// variant(variant&&) noexcept(see below);
#include <type_traits>
#include <variant>
#include "test_macros.h"
struct NTMove {
constexpr NTMove(int v) : value(v) {}
NTMove(const NTMove &) = delete;
NTMove(NTMove &&that) : value(that.value) { that.value = -1; }
int value;
};
static_assert(!std::is_trivially_move_constructible<NTMove>::value, "");
static_assert(std::is_move_constructible<NTMove>::value, "");
struct TMove {
constexpr TMove(int v) : value(v) {}
TMove(const TMove &) = delete;
TMove(TMove &&) = default;
int value;
};
static_assert(std::is_trivially_move_constructible<TMove>::value, "");
struct TMoveNTCopy {
constexpr TMoveNTCopy(int v) : value(v) {}
TMoveNTCopy(const TMoveNTCopy& that) : value(that.value) {}
TMoveNTCopy(TMoveNTCopy&&) = default;
int value;
};
static_assert(std::is_trivially_move_constructible<TMoveNTCopy>::value, "");
void test_move_ctor_sfinae() {
{
using V = std::variant<int, long>;
static_assert(std::is_trivially_move_constructible<V>::value, "");
}
{
using V = std::variant<int, NTMove>;
static_assert(!std::is_trivially_move_constructible<V>::value, "");
static_assert(std::is_move_constructible<V>::value, "");
}
{
using V = std::variant<int, TMove>;
static_assert(std::is_trivially_move_constructible<V>::value, "");
}
{
using V = std::variant<int, TMoveNTCopy>;
static_assert(std::is_trivially_move_constructible<V>::value, "");
}
}
template <typename T>
struct Result { size_t index; T value; };
void test_move_ctor_basic() {
{
struct {
constexpr Result<int> operator()() const {
std::variant<int> v(std::in_place_index<0>, 42);
std::variant<int> v2 = std::move(v);
return {v2.index(), std::get<0>(std::move(v2))};
}
} test;
constexpr auto result = test();
static_assert(result.index == 0, "");
static_assert(result.value == 42, "");
}
{
struct {
constexpr Result<long> operator()() const {
std::variant<int, long> v(std::in_place_index<1>, 42);
std::variant<int, long> v2 = std::move(v);
return {v2.index(), std::get<1>(std::move(v2))};
}
} test;
constexpr auto result = test();
static_assert(result.index == 1, "");
static_assert(result.value == 42, "");
}
{
struct {
constexpr Result<TMove> operator()() const {
std::variant<TMove> v(std::in_place_index<0>, 42);
std::variant<TMove> v2(std::move(v));
return {v2.index(), std::get<0>(std::move(v2))};
}
} test;
constexpr auto result = test();
static_assert(result.index == 0, "");
static_assert(result.value.value == 42, "");
}
{
struct {
constexpr Result<TMove> operator()() const {
std::variant<int, TMove> v(std::in_place_index<1>, 42);
std::variant<int, TMove> v2(std::move(v));
return {v2.index(), std::get<1>(std::move(v2))};
}
} test;
constexpr auto result = test();
static_assert(result.index == 1, "");
static_assert(result.value.value == 42, "");
}
{
struct {
constexpr Result<TMoveNTCopy> operator()() const {
std::variant<TMoveNTCopy> v(std::in_place_index<0>, 42);
std::variant<TMoveNTCopy> v2(std::move(v));
return {v2.index(), std::get<0>(std::move(v2))};
}
} test;
constexpr auto result = test();
static_assert(result.index == 0, "");
static_assert(result.value.value == 42, "");
}
{
struct {
constexpr Result<TMoveNTCopy> operator()() const {
std::variant<int, TMoveNTCopy> v(std::in_place_index<1>, 42);
std::variant<int, TMoveNTCopy> v2(std::move(v));
return {v2.index(), std::get<1>(std::move(v2))};
}
} test;
constexpr auto result = test();
static_assert(result.index == 1, "");
static_assert(result.value.value == 42, "");
}
}
int main() {
test_move_ctor_basic();
test_move_ctor_sfinae();
}
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