Programming in C++, 2nd Edition

Function Objects 811

Table 20.9 describes important functions of map class.

Table 20.9 Important functions of the map class

Function Task

clear( )

Removes all elements from the map

begin( )

Provides references of the first element

erase( )

Removes the given elements

insert( )

Inserts the elements as given

empty( )

Determines whether the map is vacant or not

end( )

Provides references to the end of the map

size( )

Provides the size of the map

find( )

Provides the location of the given elements

swap( )

Swaps the elements of the given map with those of the calling map

20.11 FUNCTION OBJECTS

A function object is a function. It is embedded in a class and hence