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/**
* Copyright (C) 2022-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/overloaded_visitor.h"
#include <string>
#include <utility>
#include "mongo/stdx/variant.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
TEST(OverloadedVisitorTest, StdxVisit) {
auto doVisit = [&](const stdx::variant<int, std::string>& var) {
return stdx::visit(OverloadedVisitor{
[](int v) { return 1; },
[](const std::string& v) { return 2; },
},
var);
};
ASSERT_EQ(doVisit(123), 1);
ASSERT_EQ(doVisit(std::string("hi")), 2);
}
TEST(OverloadedVisitorTest, Fallback) {
auto doVisit = [&](const stdx::variant<int, std::string>& var) {
return stdx::visit(OverloadedVisitor{
[](int v) { return 1; },
[](auto&& v) { return 2; },
},
var);
};
ASSERT_EQ(doVisit(123), 1);
ASSERT_EQ(doVisit(std::string("hi")), 2);
}
TEST(OverloadedVisitorTest, IntegerRank) {
auto doVisit = [&](const stdx::variant<int, long, long long>& var) {
return stdx::visit(OverloadedVisitor{
[](long long v) { return 1; },
[](long v) { return 2; },
[](int v) { return 3; },
},
var);
};
ASSERT_EQ(doVisit(123LL), 1);
ASSERT_EQ(doVisit(123L), 2);
ASSERT_EQ(doVisit(123), 3);
}
TEST(OverloadedVisitorTest, MultiVisit) {
stdx::variant<int, std::string> var1;
stdx::variant<int, std::string> var2;
auto doVisit = [&](const stdx::variant<int, std::string>& a,
const stdx::variant<int, std::string, double>& b) {
return stdx::visit(OverloadedVisitor{
[](int a, int b) { return 0; },
[](int a, const std::string& b) { return 1; },
[](int a, double b) { return 2; },
[](const std::string& a, int b) { return 3; },
[](const std::string& a, const std::string& b) { return 4; },
[](const std::string& a, double b) { return 5; },
},
a,
b);
};
ASSERT_EQ(doVisit(123, 123), 0);
ASSERT_EQ(doVisit(123, "b"), 1);
ASSERT_EQ(doVisit(123, 0.5), 2);
ASSERT_EQ(doVisit("a", 123), 3);
ASSERT_EQ(doVisit("a", "b"), 4);
ASSERT_EQ(doVisit("a", 0.5), 5);
}
} // namespace
} // namespace mongo
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