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AK: Convert the try_make<T> factory function to use ErrorOr
This allows more ergonomic memory allocation failure related error checking using the TRY macro.
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sideshowbarker
2024-07-17 19:49:30 +09:00
Author: https://github.com/IdanHo Commit: https://github.com/SerenityOS/serenity/commit/18b98f8c289 Pull-request: https://github.com/SerenityOS/serenity/pull/12275
@ -215,17 +215,17 @@ inline ErrorOr<NonnullOwnPtr<T>> adopt_nonnull_own_or_enomem(T* object)
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}
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template<typename T, class... Args>
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requires(IsConstructible<T, Args...>) inline OwnPtr<T> try_make(Args&&... args)
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requires(IsConstructible<T, Args...>) inline ErrorOr<NonnullOwnPtr<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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return adopt_nonnull_own_or_enomem(new (nothrow) T(forward<Args>(args)...));
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}
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// FIXME: Remove once P0960R3 is available in Clang.
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template<typename T, class... Args>
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inline OwnPtr<T> try_make(Args&&... args)
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inline ErrorOr<NonnullOwnPtr<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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return adopt_nonnull_own_or_enomem(new (nothrow) T { forward<Args>(args)... });
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}
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template<typename T>
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@ -33,13 +33,14 @@ There is a `make<T>()` helper that constructs a new object and returns it wrappe
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}
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```
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The `try_make<T>()` helper attempts to construct a new object wrapped in an `OwnPtr`. All arguments passed to it are forwarded to `T`'s constructor. In case of allocation failure, a null pointer is returned. This allows the calling code to handle allocation failure as it wishes.
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The `try_make<T>()` helper attempts to construct a new object wrapped in an `ErrorOr<NonnullOwnPtr<T>>`. All arguments passed to it are forwarded to `T`'s constructor. In case of allocation failure, an ENOMEM error is returned. This allows the calling code to handle allocation failure as it wishes.
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```cpp
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OwnPtr<Foo> my_object = try_make<Foo>();
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if (!my_object) {
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auto my_object_or_error = try_make<Foo>();
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if (my_object_or_error.is_error()) {
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// handle allocation failure...
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}
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auto my_object = my_object_or_error.release_value();
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my_object->do_stuff();
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```
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