OkOrFail<status_t> has specialized conversions for Result<int, StatusT>
to avoid ambiguous implicit conversion sequences. Since user conversion
operators sequences can be followed by integral promotion, specializing
for integral types is necessary.
Specialize ResultError<StatusT> so calling code() returns a status_t
instead of a StatusT and message() is implemented even when not carrying
a string.
Eventually, these classes should be combined.
Add equality operators for ResultError<StatusT>.
Bug: 219580167
Test: atest Errors_test.cpp
Ignore-AOSP-First: Internal topic dependencies
Change-Id: I14acecfd2aef33c40e79ddb091e2f4af9291d837
This change provide a specialization of android::base::OkOrFail for
status_t. As a result, a statement whose type is status_t can be used
with OR_RETURN.
The specialization also provides conversion operators to Result<T,
StatusT> where StatusT is a wrapper type for status_t. This allows
OR_RETURN macro to be used in newer functions that returns Result<T,
StatusT>.
Example usage:
\#include <utils/ErrorsMacros.h>
status_t legacy_inner();
status_t legacy_outer() {
OR_RETURN(legacy_inner());
return OK;
}
Result<T, StatusT> new_outer() {
OR_RETURN(legacy_inner()); // the same macro
return T{...};
}
Bug: 209929099
Test: atest libutils_test
Change-Id: I0def0e84ce3f0c4ff6d508c202bd51902dfc9618
Atneya Nair
Jiyong Park