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AK: Introduce AK::enumerate

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Co-Authored-By: Tim Flynn <trflynn89@pm.me>
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Dan Klishch 2024-03-10 20:52:50 -04:00 • committed by Tim Flynn
commit 45a0ba2167
Notes: sideshowbarker 2024-07-17 00:25:35 +09:00
3 changed files with 117 additions and 0 deletions
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Tests/AK/TestEnumerate.cpp Normal file
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/*
* Copyright (c) 2024, Dan Klishch <danilklishch@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <AK/Enumerate.h>
#include <AK/Span.h>
#include <AK/Vector.h>
struct IndexAndValue {
size_t index;
int value;
bool operator==(IndexAndValue const&) const = default;
};
TEST_CASE(enumerate)
{
{
Vector<IndexAndValue> result;
for (auto [i, value] : enumerate(Vector { 1, 2, 3, 4 })) {
result.append({ i, value });
}
EXPECT_EQ(result, (Vector<IndexAndValue> { { 0, 1 }, { 1, 2 }, { 2, 3 }, { 3, 4 } }));
}
{
Vector<IndexAndValue> result;
Vector<int> values = { 9, 8, 7, 6 };
for (auto [i, value] : enumerate(values)) {
static_assert(SameAs<decltype(value), int&>);
result.append({ i, value });
value = static_cast<int>(i);
}
EXPECT_EQ(result, (Vector<IndexAndValue> { { 0, 9 }, { 1, 8 }, { 2, 7 }, { 3, 6 } }));
EXPECT_EQ(values, (Vector<int> { 0, 1, 2, 3 }));
}
{
Vector<IndexAndValue> result;
Vector<int> const& values = { 9, 8, 7, 6 };
for (auto [i, value] : enumerate(values)) {
static_assert(SameAs<decltype(value), int const&>);
result.append({ i, value });
}
EXPECT_EQ(result, (Vector<IndexAndValue> { { 0, 9 }, { 1, 8 }, { 2, 7 }, { 3, 6 } }));
}
}