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AK: Add to_array()

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This is useful if you want an array with an explicit type but still
want its size to be inferred.
This commit is contained in:
Nico Weber 2024-02-08 18:52:45 -05:00 • committed by Ali Mohammad Pur
parent 10216e1743
commit d84b69ace9
2 changed files with 24 additions and 0 deletions
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15
AK/Array.h
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@ -162,9 +162,24 @@ constexpr auto iota_array(T const offset = {})
return Detail::integer_sequence_generate_array<T>(offset, MakeIntegerSequence<T, N>());
}
namespace Detail {
template<typename T, size_t N, size_t... Is>
constexpr auto to_array_impl(T (&&a)[N], IndexSequence<Is...>) -> Array<T, sizeof...(Is)>
{
return { { a[Is]... } };
}
}
template<typename T, size_t N>
constexpr auto to_array(T (&&a)[N])
{
return Detail::to_array_impl(move(a), MakeIndexSequence<N>());
}
}
#if USING_AK_GLOBALLY
using AK::Array;
using AK::iota_array;
using AK::to_array;
#endif

9
Tests/AK/TestArray.cpp
View file

@ -46,3 +46,12 @@ TEST_CASE(first_index_of)
EXPECT(array.first_index_of(7) == 7u);
EXPECT(!array.first_index_of(42).has_value());
}
TEST_CASE(to_array)
{
constexpr auto array = to_array<u8>({ 0, 2, 1 });
static_assert(array.size() == 3);
static_assert(array[0] == 0);
static_assert(array[1] == 2);
static_assert(array[2] == 1);
}