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AK: Add a constructor from Span for FixedArray

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This is particularly useful in the Kernel, where the physical pages of
a VMObject are stored as a FixedArray but often passed around as a Span
from which a new FixedArray should be cloned.
This commit is contained in:
creator1creeper1 2022-01-12 16:39:31 +01:00 committed by Idan Horowitz
parent 0362b15895
commit 64778f9e69
Notes: sideshowbarker 2024-07-17 20:50:25 +09:00 
Author: https://github.com/creator1creeper1
Commit: https://github.com/SerenityOS/serenity/commit/64778f9e69b
Pull-request: https://github.com/SerenityOS/serenity/pull/11843
Reviewed-by: https://github.com/IdanHo ✅
Reviewed-by: https://github.com/bgianfo
1 changed files with 13 additions and 0 deletions
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13
AK/FixedArray.h
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@ -55,6 +55,19 @@ public:
return FixedArray<T>(N, elements); return FixedArray<T>(N, elements);
} }
template<typename U>
static ErrorOr<FixedArray<T>> try_create(Span<U> span)
{
if (span.size() == 0)
return FixedArray<T>();
T* elements = static_cast<T*>(kmalloc_array(span.size(), sizeof(T)));
if (!elements)
return Error::from_errno(ENOMEM);
for (size_t i = 0; i < span.size(); ++i)
new (&elements[i]) T(span[i]);
return FixedArray<T>(span.size(), elements);
}
ErrorOr<FixedArray<T>> try_clone() const ErrorOr<FixedArray<T>> try_clone() const
{ {
if (m_size == 0) if (m_size == 0)