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AK: Convert the try_make<T> factory function to use ErrorOr

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This allows more ergonomic memory allocation failure related error
checking using the TRY macro.
This commit is contained in:
Idan Horowitz 2022-02-03 17:19:53 +02:00 • committed by Andreas Kling
parent ba0a2a3e2f
commit 18b98f8c28
2 changed files with 8 additions and 7 deletions
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7
Documentation/SmartPointers.md
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@ -33,13 +33,14 @@ There is a `make<T>()` helper that constructs a new object and returns it wrappe
}
```
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.
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.
```cpp
OwnPtr<Foo> my_object = try_make<Foo>();
if (!my_object) {
auto my_object_or_error = try_make<Foo>();
if (my_object_or_error.is_error()) {
// handle allocation failure...
}
auto my_object = my_object_or_error.release_value();
my_object->do_stuff();
```