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Helper template functions used to convert unary and binary function pointers, respectively, into unary and binary adaptable functions.

template<class Arg, class Result> 
   pointer_to_unary_function<Arg, Result, Result (*)(Arg)> 
      ptr_fun(Result (*_pfunc)(Arg)); 
template<class Arg1, class Arg2, class Result> 
   pointer_to_binary_function<Arg1, Arg2, Result, Result (*)(Arg1, Arg2)> 
      ptr_fun(Result (*_pfunc)(Arg1, Arg2));


The unary or binary function pointer to be converted to an adaptable function.

The first template function returns the unary function pointer_to_unary_function <Arg, Result>(*_pfunc).

The second template function returns binary function pointer_to_binary_function <Arg1, Arg2, Result>(*_pfunc).

A function pointer is a function object and may be passed to any Standard Template Library algorithm that is expecting a function as a parameter, but it is not adaptable. To use it with an adaptor, such as binding a value to it or using it with a negator, it must be supplied with the nested types that make such an adaptation possible. The conversion of unary and binary function pointers by the ptr_fun helper function allows the function adaptors to work with unary and binary function pointers.

Original sequence contains: Open up the opalescent gates
Found a match: opalescent

Header: <functional>

Namespace: std