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Message: [QUOTE="Jerry Coffin, post: 3410597"] [i][i] As long as you only want to support pointers to functions (not functors) it's pretty simple -- just templatize the input and output types: // warning: only minimally tested // // This depends on 'array; defining size_type, though size_t would also // work better than int without that requirement. // template <class A, class B> array<A> apply(const array<B> &source, A (*fun)(B)) { array<A> result(source.size()); for (array<A>::size_type i=0; i<source.size(); ++i) result[i] = fun(source[i]); return result; } You'll have to work a bit harder if you want to support functors. OTOH, std::transform already provides the same basic capability with slightly differetnt syntax and more flexibility, so I don't see much point in working much more on this...[/i][/i][/i][/i] [/QUOTE]