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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>
// constexpr bool
// operator==(variant<Types...> const&, variant<Types...> const&) noexcept;
//
// template <class ...Types>
// constexpr bool
// operator!=(variant<Types...> const&, variant<Types...> const&) noexcept;
//
// template <class ...Types>
// constexpr bool
// operator<(variant<Types...> const&, variant<Types...> const&) noexcept;
//
// template <class ...Types>
// constexpr bool
// operator>(variant<Types...> const&, variant<Types...> const&) noexcept;
//
// template <class ...Types>
// constexpr bool
// operator<=(variant<Types...> const&, variant<Types...> const&) noexcept;
//
// template <class ...Types>
// constexpr bool
// operator>=(variant<Types...> const&, variant<Types...> const&) noexcept;
#include <cassert>
#include <type_traits>
#include <utility>
#include <variant>
#include "test_macros.h"
#ifndef TEST_HAS_NO_EXCEPTIONS
struct MakeEmptyT {
MakeEmptyT() = default;
MakeEmptyT(MakeEmptyT &&) { throw 42; }
MakeEmptyT &operator=(MakeEmptyT &&) { throw 42; }
};
inline bool operator==(const MakeEmptyT &, const MakeEmptyT &) {
assert(false);
return false;
}
inline bool operator!=(const MakeEmptyT &, const MakeEmptyT &) {
assert(false);
return false;
}
inline bool operator<(const MakeEmptyT &, const MakeEmptyT &) {
assert(false);
return false;
}
inline bool operator<=(const MakeEmptyT &, const MakeEmptyT &) {
assert(false);
return false;
}
inline bool operator>(const MakeEmptyT &, const MakeEmptyT &) {
assert(false);
return false;
}
inline bool operator>=(const MakeEmptyT &, const MakeEmptyT &) {
assert(false);
return false;
}
template <class Variant> void makeEmpty(Variant &v) {
Variant v2(std::in_place_type<MakeEmptyT>);
try {
v = std::move(v2);
assert(false);
} catch (...) {
assert(v.valueless_by_exception());
}
}
#endif // TEST_HAS_NO_EXCEPTIONS
void test_equality() {
{
using V = std::variant<int, long>;
constexpr V v1(42);
constexpr V v2(42);
static_assert(v1 == v2, "");
static_assert(v2 == v1, "");
static_assert(!(v1 != v2), "");
static_assert(!(v2 != v1), "");
}
{
using V = std::variant<int, long>;
constexpr V v1(42);
constexpr V v2(43);
static_assert(!(v1 == v2), "");
static_assert(!(v2 == v1), "");
static_assert(v1 != v2, "");
static_assert(v2 != v1, "");
}
{
using V = std::variant<int, long>;
constexpr V v1(42);
constexpr V v2(42l);
static_assert(!(v1 == v2), "");
static_assert(!(v2 == v1), "");
static_assert(v1 != v2, "");
static_assert(v2 != v1, "");
}
{
using V = std::variant<int, long>;
constexpr V v1(42l);
constexpr V v2(42l);
static_assert(v1 == v2, "");
static_assert(v2 == v1, "");
static_assert(!(v1 != v2), "");
static_assert(!(v2 != v1), "");
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
using V = std::variant<int, MakeEmptyT>;
V v1;
V v2;
makeEmpty(v2);
assert(!(v1 == v2));
assert(!(v2 == v1));
assert(v1 != v2);
assert(v2 != v1);
}
{
using V = std::variant<int, MakeEmptyT>;
V v1;
makeEmpty(v1);
V v2;
assert(!(v1 == v2));
assert(!(v2 == v1));
assert(v1 != v2);
assert(v2 != v1);
}
{
using V = std::variant<int, MakeEmptyT>;
V v1;
makeEmpty(v1);
V v2;
makeEmpty(v2);
assert(v1 == v2);
assert(v2 == v1);
assert(!(v1 != v2));
assert(!(v2 != v1));
}
#endif
}
template <class Var>
constexpr bool test_less(const Var &l, const Var &r, bool expect_less,
bool expect_greater) {
return ((l < r) == expect_less) && (!(l >= r) == expect_less) &&
((l > r) == expect_greater) && (!(l <= r) == expect_greater);
}
void test_relational() {
{ // same index, same value
using V = std::variant<int, long>;
constexpr V v1(1);
constexpr V v2(1);
static_assert(test_less(v1, v2, false, false), "");
}
{ // same index, value < other_value
using V = std::variant<int, long>;
constexpr V v1(0);
constexpr V v2(1);
static_assert(test_less(v1, v2, true, false), "");
}
{ // same index, value > other_value
using V = std::variant<int, long>;
constexpr V v1(1);
constexpr V v2(0);
static_assert(test_less(v1, v2, false, true), "");
}
{ // LHS.index() < RHS.index()
using V = std::variant<int, long>;
constexpr V v1(0);
constexpr V v2(0l);
static_assert(test_less(v1, v2, true, false), "");
}
{ // LHS.index() > RHS.index()
using V = std::variant<int, long>;
constexpr V v1(0l);
constexpr V v2(0);
static_assert(test_less(v1, v2, false, true), "");
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{ // LHS.index() < RHS.index(), RHS is empty
using V = std::variant<int, MakeEmptyT>;
V v1;
V v2;
makeEmpty(v2);
assert(test_less(v1, v2, false, true));
}
{ // LHS.index() > RHS.index(), LHS is empty
using V = std::variant<int, MakeEmptyT>;
V v1;
makeEmpty(v1);
V v2;
assert(test_less(v1, v2, true, false));
}
{ // LHS.index() == RHS.index(), LHS and RHS are empty
using V = std::variant<int, MakeEmptyT>;
V v1;
makeEmpty(v1);
V v2;
makeEmpty(v2);
assert(test_less(v1, v2, false, false));
}
#endif
}
int main() {
test_equality();
test_relational();
}
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