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Tip of the Day
Language: C++
Expertise: Intermediate
Nov 18, 1998

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Const Iterators

You can think of an iterator as a pointer to elements of a container. All STL (Standard Template Library) containers provide the basic iterator type along with its const counterpart. The const iterator of a container should be used when the elements accessed through it are not supposed to be modified, like in the following example:
 
void main() {
	string s ("hello world"); // s contains 11 characters 
	string::const_iterator p = s.begin(); //p is a const iterator pointing to the first element of s 
	size_t n = 0; 

	while ( p < s.end() ) {   // a loop that count the number of chars in s
	 n++;   
 p++;   // move to the next element of s
	}
	cout<<n;  
}    
Danny Kalev
 
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