/
get_index.pass.cpp
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/
get_index.pass.cpp
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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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++98, c++03, c++11, c++14
// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
// <variant>
// template <size_t I, class... Types>
// constexpr variant_alternative_t<I, variant<Types...>>&
// get(variant<Types...>& v);
// template <size_t I, class... Types>
// constexpr variant_alternative_t<I, variant<Types...>>&&
// get(variant<Types...>&& v);
// template <size_t I, class... Types>
// constexpr variant_alternative_t<I, variant<Types...>> const& get(const
// variant<Types...>& v);
// template <size_t I, class... Types>
// constexpr variant_alternative_t<I, variant<Types...>> const&& get(const
// variant<Types...>&& v);
#include "test_macros.h"
#include "variant_test_helpers.hpp"
#include <cassert>
#include <type_traits>
#include <utility>
#include <variant>
void test_const_lvalue_get() {
{
using V = std::variant<int, const long>;
constexpr V v(42);
#ifdef TEST_WORKAROUND_CONSTEXPR_IMPLIES_NOEXCEPT
ASSERT_NOEXCEPT(std::get<0>(v));
#else
ASSERT_NOT_NOEXCEPT(std::get<0>(v));
#endif
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
static_assert(std::get<0>(v) == 42, "");
}
{
using V = std::variant<int, const long>;
const V v(42);
ASSERT_NOT_NOEXCEPT(std::get<0>(v));
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
assert(std::get<0>(v) == 42);
}
{
using V = std::variant<int, const long>;
constexpr V v(42l);
#ifdef TEST_WORKAROUND_CONSTEXPR_IMPLIES_NOEXCEPT
ASSERT_NOEXCEPT(std::get<1>(v));
#else
ASSERT_NOT_NOEXCEPT(std::get<1>(v));
#endif
ASSERT_SAME_TYPE(decltype(std::get<1>(v)), const long &);
static_assert(std::get<1>(v) == 42, "");
}
{
using V = std::variant<int, const long>;
const V v(42l);
ASSERT_NOT_NOEXCEPT(std::get<1>(v));
ASSERT_SAME_TYPE(decltype(std::get<1>(v)), const long &);
assert(std::get<1>(v) == 42);
}
// FIXME: Remove these once reference support is reinstated
#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
{
using V = std::variant<int &>;
int x = 42;
const V v(x);
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), int &);
assert(&std::get<0>(v) == &x);
}
{
using V = std::variant<int &&>;
int x = 42;
const V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), int &);
assert(&std::get<0>(v) == &x);
}
{
using V = std::variant<const int &&>;
int x = 42;
const V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
assert(&std::get<0>(v) == &x);
}
#endif
}
void test_lvalue_get() {
{
using V = std::variant<int, const long>;
V v(42);
ASSERT_NOT_NOEXCEPT(std::get<0>(v));
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), int &);
assert(std::get<0>(v) == 42);
}
{
using V = std::variant<int, const long>;
V v(42l);
ASSERT_SAME_TYPE(decltype(std::get<1>(v)), const long &);
assert(std::get<1>(v) == 42);
}
// FIXME: Remove these once reference support is reinstated
#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
{
using V = std::variant<int &>;
int x = 42;
V v(x);
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), int &);
assert(&std::get<0>(v) == &x);
}
{
using V = std::variant<const int &>;
int x = 42;
V v(x);
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
assert(&std::get<0>(v) == &x);
}
{
using V = std::variant<int &&>;
int x = 42;
V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), int &);
assert(&std::get<0>(v) == &x);
}
{
using V = std::variant<const int &&>;
int x = 42;
V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
assert(&std::get<0>(v) == &x);
}
#endif
}
void test_rvalue_get() {
{
using V = std::variant<int, const long>;
V v(42);
ASSERT_NOT_NOEXCEPT(std::get<0>(std::move(v)));
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), int &&);
assert(std::get<0>(std::move(v)) == 42);
}
{
using V = std::variant<int, const long>;
V v(42l);
ASSERT_SAME_TYPE(decltype(std::get<1>(std::move(v))), const long &&);
assert(std::get<1>(std::move(v)) == 42);
}
// FIXME: Remove these once reference support is reinstated
#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
{
using V = std::variant<int &>;
int x = 42;
V v(x);
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), int &);
assert(&std::get<0>(std::move(v)) == &x);
}
{
using V = std::variant<const int &>;
int x = 42;
V v(x);
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), const int &);
assert(&std::get<0>(std::move(v)) == &x);
}
{
using V = std::variant<int &&>;
int x = 42;
V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), int &&);
int &&xref = std::get<0>(std::move(v));
assert(&xref == &x);
}
{
using V = std::variant<const int &&>;
int x = 42;
V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), const int &&);
const int &&xref = std::get<0>(std::move(v));
assert(&xref == &x);
}
#endif
}
void test_const_rvalue_get() {
{
using V = std::variant<int, const long>;
const V v(42);
ASSERT_NOT_NOEXCEPT(std::get<0>(std::move(v)));
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), const int &&);
assert(std::get<0>(std::move(v)) == 42);
}
{
using V = std::variant<int, const long>;
const V v(42l);
ASSERT_SAME_TYPE(decltype(std::get<1>(std::move(v))), const long &&);
assert(std::get<1>(std::move(v)) == 42);
}
// FIXME: Remove these once reference support is reinstated
#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
{
using V = std::variant<int &>;
int x = 42;
const V v(x);
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), int &);
assert(&std::get<0>(std::move(v)) == &x);
}
{
using V = std::variant<const int &>;
int x = 42;
const V v(x);
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), const int &);
assert(&std::get<0>(std::move(v)) == &x);
}
{
using V = std::variant<int &&>;
int x = 42;
const V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), int &&);
int &&xref = std::get<0>(std::move(v));
assert(&xref == &x);
}
{
using V = std::variant<const int &&>;
int x = 42;
const V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get<0>(std::move(v))), const int &&);
const int &&xref = std::get<0>(std::move(v));
assert(&xref == &x);
}
#endif
}
template <std::size_t I> using Idx = std::integral_constant<size_t, I>;
void test_throws_for_all_value_categories() {
#ifndef TEST_HAS_NO_EXCEPTIONS
using V = std::variant<int, long>;
V v0(42);
const V &cv0 = v0;
assert(v0.index() == 0);
V v1(42l);
const V &cv1 = v1;
assert(v1.index() == 1);
std::integral_constant<size_t, 0> zero;
std::integral_constant<size_t, 1> one;
auto test = [](auto idx, auto &&v) {
using Idx = decltype(idx);
try {
TEST_IGNORE_NODISCARD std::get<Idx::value>(std::forward<decltype(v)>(v));
} catch (const std::bad_variant_access &) {
return true;
} catch (...) { /* ... */
}
return false;
};
{ // lvalue test cases
assert(test(one, v0));
assert(test(zero, v1));
}
{ // const lvalue test cases
assert(test(one, cv0));
assert(test(zero, cv1));
}
{ // rvalue test cases
assert(test(one, std::move(v0)));
assert(test(zero, std::move(v1)));
}
{ // const rvalue test cases
assert(test(one, std::move(cv0)));
assert(test(zero, std::move(cv1)));
}
#endif
}
int main(int, char**) {
test_const_lvalue_get();
test_lvalue_get();
test_rvalue_get();
test_const_rvalue_get();
test_throws_for_all_value_categories();
return 0;
}