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AK+Tests: Add Vector::find_first_index_if()

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Sam Atkins 2023-04-10 17:27:16 +01:00 committed by Andreas Kling
parent 1352f8820b
commit 89e55c5297
Notes: sideshowbarker 2024-07-17 02:59:43 +09:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/SerenityOS/serenity/commit/89e55c5297
Pull-request: https://github.com/SerenityOS/serenity/pull/18289
2 changed files with 17 additions and 0 deletions
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9
AK/Vector.h
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@ -796,6 +796,15 @@ public:
return {};
}
template<typename TUnaryPredicate>
Optional<size_t> find_first_index_if(TUnaryPredicate&& finder) const
{
auto maybe_result = AK::find_if(begin(), end(), finder);
if (maybe_result == end())
return {};
return maybe_result.index();
}
void reverse()
{
for (size_t i = 0; i < size() / 2; ++i)

8
Tests/AK/TestVector.cpp
View file

@ -423,6 +423,14 @@ TEST_CASE(should_find_index)
EXPECT(!v.find_first_index(42).has_value());
}
TEST_CASE(should_find_predicate_index)
{
Vector<int> v { 1, 2, 3, 4, 0, 6, 7, 8, 0, 0 };
EXPECT_EQ(4u, v.find_first_index_if([](auto const v) { return v == 0; }).value());
EXPECT(!v.find_first_index_if([](auto const v) { return v == 123; }).has_value());
}
TEST_CASE(should_contain_start)
{
// Tests whether value is found if at the start of the range.