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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/util/static_immortal.h"
#include <map>
#include <string>
#include <type_traits>
#include <utility>
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
using Map = std::map<std::string, int>;
int ctors;
struct Indestructible {
explicit Indestructible() {
++ctors;
}
~Indestructible() = delete; // Compile failure if StaticImmortal tries to kill me
void use() {}
void useConst() const {}
};
TEST(StaticImmortalTest, BasicConstructorAndCast) {
ctors = 0;
{
auto&& x = *StaticImmortal<Indestructible>();
x.use();
}
ASSERT_EQ(ctors, 1);
}
TEST(StaticImmortalTest, PointerSyntax) {
auto&& x = StaticImmortal<Indestructible>();
x->useConst();
(*x).useConst();
x->use();
(*x).use();
const auto& cx = x;
cx->useConst();
(*cx).useConst();
}
TEST(StaticImmortalTest, StaticDurationIdiom) {
static auto&& x = StaticImmortal<Indestructible>();
static_assert(std::is_same_v<decltype(x), StaticImmortal<Indestructible>&&>);
}
TEST(StaticImmortalTest, DeducedValueTypeCopyInit) {
static const StaticImmortal m = Map{{"hello", 123}, {"bye", 456}};
ASSERT_EQ(m->find("bye")->second, 456);
}
TEST(StaticImmortalTest, DeducedValueTypeExpression) {
static const StaticImmortal m = [] {
return Map{{"hello", 123}, {"bye", 456}};
}();
ASSERT_EQ(m->find("bye")->second, 456);
}
TEST(StaticImmortalTest, BraceInit) {
static const StaticImmortal<Map> m{{{"hello", 123}, {"bye", 456}}};
ASSERT_EQ(m->find("bye")->second, 456);
}
TEST(StaticImmortalTest, ListInit) {
static const StaticImmortal<Map> m = {{{"hello", 123}, {"bye", 456}}};
ASSERT_EQ(m->find("bye")->second, 456);
}
TEST(StaticImmortalTest, EmptyBrace) {
static const StaticImmortal<Map> empty{};
ASSERT_TRUE(empty->empty());
}
} // namespace
} // namespace mongo
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