Function objects

Function objects have the operator() defined and used for more effective use of the library. When a pointer to a function would normally be passed to an algorithm function the library is specified to accept an object with operator() defined. The use of function objects with function templates increases the power and efficiency of the library

Struct Unary_function and Struct Binary_function classes are provided to simplify the typedef of the argument and result types.

Note: In order to manipulate function objects that take one or two arguments it is required that their function objects provide the defined types. If the function object takes one argument then argument_type and result_type are defined. If the function object takes two arguments then the first_argument_type, second_argument_type, and result_type must be defined.


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