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perl-Context-Preserve - Run code after a subroutine call, preserving context
- Description:
Sometimes you need to call a function, get the results, act on the
results, then return the result of the function. This is painful because
of contexts; the original function can behave different if it's called
in void, scalar, or list context. You can ignore the various cases and
just pick one, but that's fragile. To do things right, you need to see
which case you're being called in, and then call the function in that
context. This results in 3 code paths, which is a pain to type in (and
maintain). This module automates the process. You provide a coderef that
is the "original function", and another coderef to run after the
original runs. You can modify the return value (aliased to @_) here, and
do whatever else you need to do. 'wantarray' is correct inside both
coderefs; in "after", though, the return value is ignored and the value
'wantarray' returns is related to the context that the original function
was called in.
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