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AK: Add a Tuple implementation

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Please don't use this outside of metaprogramming needs, *please*.
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Ali Mohammad Pur 2021-05-09 08:24:22 +04:30 • committed by Linus Groh
parent 4fdbac236d
commit 02de813950
3 changed files with 328 additions and 0 deletions
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109
Tests/AK/TestTuple.cpp Normal file
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/*
* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenity.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestSuite.h>
#include <AK/Tuple.h>
TEST_CASE(basic)
{
Tuple<int, String> value { 1, "foo" };
EXPECT_EQ(value.get<int>(), 1);
EXPECT_EQ(value.get<String>(), "foo");
EXPECT_EQ(value.get<0>(), 1);
EXPECT_EQ(value.get<1>(), "foo");
// Move assignment
value = { 2, "bar" };
EXPECT_EQ(value.get<int>(), 2);
EXPECT_EQ(value.get<String>(), "bar");
EXPECT_EQ(value.get<0>(), 2);
EXPECT_EQ(value.get<1>(), "bar");
// Copy ctor
auto other_value { value };
EXPECT_EQ(other_value.get<int>(), 2);
EXPECT_EQ(other_value.get<String>(), "bar");
EXPECT_EQ(other_value.get<0>(), 2);
EXPECT_EQ(other_value.get<1>(), "bar");
// Move ctor
auto moved_to_value { move(value) };
EXPECT_EQ(moved_to_value.get<int>(), 2);
EXPECT_EQ(moved_to_value.get<String>(), "bar");
EXPECT_EQ(moved_to_value.get<0>(), 2);
EXPECT_EQ(moved_to_value.get<1>(), "bar");
// Copy assignment
value = moved_to_value;
EXPECT_EQ(moved_to_value.get<int>(), 2);
EXPECT_EQ(moved_to_value.get<String>(), "bar");
EXPECT_EQ(moved_to_value.get<0>(), 2);
EXPECT_EQ(moved_to_value.get<1>(), "bar");
EXPECT_EQ(value.get<int>(), 2);
EXPECT_EQ(value.get<String>(), "bar");
EXPECT_EQ(value.get<0>(), 2);
EXPECT_EQ(value.get<1>(), "bar");
}
TEST_CASE(no_copy)
{
struct NoCopy {
AK_MAKE_NONCOPYABLE(NoCopy);
public:
NoCopy(NoCopy&&) = default;
NoCopy() = default;
};
// Deleted copy ctor should not cause an issue so long as the value isn't copied.
Tuple<NoCopy, int, int> value { {}, 1, 2 };
auto foo = move(value);
EXPECT_EQ(foo.get<1>(), 1);
EXPECT_EQ(foo.get<2>(), 2);
}
TEST_CASE(apply)
{
Tuple<int, int, String> args { 1, 2, "foo" };
// With copy
{
bool was_called = false;
args.apply_as_args([&](int a, int b, String c) {
was_called = true;
EXPECT_EQ(a, 1);
EXPECT_EQ(b, 2);
EXPECT_EQ(c, "foo");
});
EXPECT(was_called);
}
// With reference
{
bool was_called = false;
args.apply_as_args([&](int& a, int& b, String& c) {
was_called = true;
EXPECT_EQ(a, 1);
EXPECT_EQ(b, 2);
EXPECT_EQ(c, "foo");
});
EXPECT(was_called);
}
// With const reference, taken from a const tuple
{
bool was_called = false;
const auto& args_ref = args;
args_ref.apply_as_args([&](const int& a, const int& b, const String& c) {
was_called = true;
EXPECT_EQ(a, 1);
EXPECT_EQ(b, 2);
EXPECT_EQ(c, "foo");
});
EXPECT(was_called);
}
}