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AK: Add factory methods for creating smart pointers
These functions abstract away the need to call the proper new operator ("throwing" or "non-throwing") and manually adopt the resulting raw pointer. Modelled after the existing `NonnullOwnPtr<T> make()` functions, these forward their parameters to the object's constructor. Note: These can't be used in the common "factory method" idiom, as private constructors can't be called from a standalone function. The naming is consistent with AK's and Shell's previous implementation of these: - `make` creates a `NonnullOwnPtr<T>` and aborts if the allocation could not be performed. - `try_make` creates an `OwnPtr<T>`, which may be null if the allocation failed. - `create` creates a `NonnullRefPtr<T>`, and aborts on allocation failure. - `try_create` creates a `RefPtr<T>`, which may be null if the allocation was not successful.
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4 changed files with 22 additions and 2 deletions
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@ -206,6 +206,12 @@ inline OwnPtr<T> adopt_own_if_nonnull(T* object)
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return {};
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}
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template<typename T, class... Args>
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inline OwnPtr<T> try_make(Args&&... args)
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{
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return adopt_own_if_nonnull(new (nothrow) T(forward<Args>(args)...));
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}
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template<typename T>
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struct Traits<OwnPtr<T>> : public GenericTraits<OwnPtr<T>> {
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using PeekType = T*;
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@ -218,3 +224,4 @@ struct Traits<OwnPtr<T>> : public GenericTraits<OwnPtr<T>> {
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using AK::adopt_own_if_nonnull;
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using AK::OwnPtr;
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using AK::try_make;
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