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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
// <variant>
// XFAIL: availability=macosx10.13
// XFAIL: availability=macosx10.12
// XFAIL: availability=macosx10.11
// XFAIL: availability=macosx10.10
// XFAIL: availability=macosx10.9
// XFAIL: availability=macosx10.8
// XFAIL: availability=macosx10.7
// template <class ...Types> class variant;
// template <size_t I, class Up, class ...Args>
// constexpr explicit
// variant(in_place_index_t<I>, initializer_list<Up>, Args&&...);
#include <cassert>
#include <string>
#include <type_traits>
#include <variant>
#include "test_convertible.hpp"
#include "test_macros.h"
struct InitList {
std::size_t size;
constexpr InitList(std::initializer_list<int> il) : size(il.size()) {}
};
struct InitListArg {
std::size_t size;
int value;
constexpr InitListArg(std::initializer_list<int> il, int v)
: size(il.size()), value(v) {}
};
void test_ctor_sfinae() {
using IL = std::initializer_list<int>;
{ // just init list
using V = std::variant<InitList, InitListArg, int>;
static_assert(std::is_constructible<V, std::in_place_index_t<0>, IL>::value,
"");
static_assert(!test_convertible<V, std::in_place_index_t<0>, IL>(), "");
}
{ // too many arguments
using V = std::variant<InitList, InitListArg, int>;
static_assert(
!std::is_constructible<V, std::in_place_index_t<0>, IL, int>::value,
"");
static_assert(!test_convertible<V, std::in_place_index_t<0>, IL, int>(),
"");
}
{ // too few arguments
using V = std::variant<InitList, InitListArg, int>;
static_assert(
!std::is_constructible<V, std::in_place_index_t<1>, IL>::value, "");
static_assert(!test_convertible<V, std::in_place_index_t<1>, IL>(), "");
}
{ // init list and arguments
using V = std::variant<InitList, InitListArg, int>;
static_assert(
std::is_constructible<V, std::in_place_index_t<1>, IL, int>::value, "");
static_assert(!test_convertible<V, std::in_place_index_t<1>, IL, int>(),
"");
}
{ // not constructible from arguments
using V = std::variant<InitList, InitListArg, int>;
static_assert(
!std::is_constructible<V, std::in_place_index_t<2>, IL>::value, "");
static_assert(!test_convertible<V, std::in_place_index_t<2>, IL>(), "");
}
{ // index not in variant
using V = std::variant<InitList, InitListArg, int>;
static_assert(
!std::is_constructible<V, std::in_place_index_t<3>, IL>::value, "");
static_assert(!test_convertible<V, std::in_place_index_t<3>, IL>(), "");
}
}
void test_ctor_basic() {
{
constexpr std::variant<InitList, InitListArg, InitList> v(
std::in_place_index<0>, {1, 2, 3});
static_assert(v.index() == 0, "");
static_assert(std::get<0>(v).size == 3, "");
}
{
constexpr std::variant<InitList, InitListArg, InitList> v(
std::in_place_index<2>, {1, 2, 3});
static_assert(v.index() == 2, "");
static_assert(std::get<2>(v).size == 3, "");
}
{
constexpr std::variant<InitList, InitListArg, InitListArg> v(
std::in_place_index<1>, {1, 2, 3, 4}, 42);
static_assert(v.index() == 1, "");
static_assert(std::get<1>(v).size == 4, "");
static_assert(std::get<1>(v).value == 42, "");
}
}
int main() {
test_ctor_basic();
test_ctor_sfinae();
}
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