Pure
Ola Fosheim Grøstad" <ola.fosheim.grostad+dlang at gmail.com>
Ola Fosheim Grøstad" <ola.fosheim.grostad+dlang at gmail.com>
Wed Jan 8 10:40:45 PST 2014
Is pure meant to be a compiler hint so that it is up to the
programmer to enforce it? It is sometimes useful to maintain
hidden state for lazy evaluation, that does not affect purity
optimizations:
e.g.
a = foo(1) // evaluates, caches and returns value
b = foo(1) // returns cached value
c = foo (1) // returns cached value
is optimized to
a = b = c = foo(1) // evaluates, caches and returns value
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