It's not that it's hard, it's just that it is not inline, so it requires a context switch because the CM is defined outside, even when it's doing something specific.
The most common problem that defer is trying to solve is cleanup when the function returns early (ususally because of an error). Writing the cleanup code inline before the early return results in code duplication.
C#/Java/Javascript have try/finally for this, C has the "goto cleanup" idiom, and C++ and Rust have the guard objects. Go and Alumina have defer.
The most common problem that defer is trying to solve is cleanup when the function returns early (ususally because of an error). Writing the cleanup code inline before the early return results in code duplication.
C#/Java/Javascript have try/finally for this, C has the "goto cleanup" idiom, and C++ and Rust have the guard objects. Go and Alumina have defer.