To allow pointers to (unary and binary) functions to work with function adaptors the library provides:
template <class Arg, class Result> class pointer_to_unary_function : public unary_function<Arg, Result> { public: explicit pointer_to_unary_function(Result (*f)(Arg)); Result operator()(Arg x) const; };
template <class Arg, class Result> pointer_to_unary_function<Arg, Result> ptr_fun(Result (*f)(Arg));
Returns: pointer_to_unary_function<Arg, Result>(f).
template <class Arg1, class Arg2, class Result> class pointer_to_binary_function : public binary_function<Arg1,Arg2,Result> { public: explicit pointer_to_binary_function(Result (*f)(Arg1, Arg2)); Result operator()(Arg1 x, Arg2 y) const; };
operator() returns f(x,y).
template <class Arg1, class Arg2, class Result> pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun(Result (*f)(Arg1, Arg2));
Returns: pointer_to_binary_function<Arg1,Arg2,Result>(f).
[ Example:
int compare(const char*, const char*); replace_if(v.begin(), v.end(), not1(bind2nd(ptr_fun(compare), "abc")), "def");
replaces each abc with def in sequence v. — end example ]
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