Report a fatal error if ValOrErr is a failure value, otherwise unwraps and returns the contained reference.
Synopsis
Declared in <llvm/Support/Error.h>
template<typename T>
T&
cantFail(
Expected<T&> ValOrErr,
char const* Msg = nullptr);Description
This function can be used to wrap calls to fallible functions ONLY when it is known that the Error will always be a success value. E.g.
// foo only attempts the fallible operation if DoFallibleOperation is
// true. If DoFallibleOperation is false then foo always returns a Bar&.
Expected<Bar&> foo(bool DoFallibleOperation);
Bar &X = cantFail(foo(false));Return Value
The contained reference from ValOrErr.
Parameters
Name |
Description |
ValOrErr |
Expected reference that must hold success. |
Msg |
Optional message used if |
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