Standard C++ Library
Copyright 1998, Rogue Wave Software, Inc.
- Base class for creating binary function objects.
template <class Arg1, class Arg2, class Result>
typedef Arg1 first_argument_type;
typedef Arg2 second_argument_type;
typedef Result result_type;
Function objects are objects with an operator() defined.
They are important for the effective use of the standard
library's generic algorithms, because the interface for each
algorithmic template can accept either an object with an
operator() defined or a pointer to a function. The Standard
C++ Library includes both a standard set of function
objects, and a pair of classes that you can use as the base
for creating your own function objects.
Function objects that take two arguments are called binary
function objects. Binary function objects are required to
include the typedefs first_argument_type,
second_argument_type, and result_type. The binary_function
class makes the task of creating templatized binary function
objects easier by including the necessary typedefs for a
binary function object. You can create your own binary func-
tion objects by inheriting from binary_function.
Function_Objects, unary_function, the Function Objects sec-
tion of the User's Guide.