K 10
svn:author
V 7
sunpoet
K 8
svn:date
V 27
2015-04-26T12:28:06.768317Z
K 7
svn:log
V 827
- Add p5-constant-defer 6

constant::defer creates a subroutine which on the first call runs given code to
calculate its value, and on any subsequent calls just returns that value, like a
constant. The value code is discarded once run, allowing it to be garbage
collected.

Deferring a calculation is good if it might take a lot of work or produce a big
result but is only needed sometimes or only well into a program run. If it's
never needed then the value code never runs.

A deferred constant is generally not inlined or folded (see "Constant Folding"
in perlop) since it's not a single scalar value. In the current implementation a
deferred constant becomes a plain constant after the first use, so may inline
etc in code compiled after that (see "IMPLEMENTATION" below).

WWW: http://search.cpan.org/dist/constant-defer/

END