operator== (<iterator>)
Tests if the iterator object on the left side of the operator is equal to the iterator object on the right side.
Syntax
template<class RandomIterator1, class RandomIterator2>
bool operator==(
const move_iterator<RandomIterator1>& _Left,
const move_iterator<RandomIterator2>& _Right
);
template<class RandomIterator1, class RandomIterator2>
bool operator==(
const reverse_iterator<RandomIterator1>& _Left,
const reverse_iterator<RandomIterator2>& _Right
);
template<class Type, class CharType, class Traits, class Distance>
bool operator==(
const istream_iterator<Type, CharType, Traits, Distance>& _Left,
const istream_iterator<Type, CharType, Traits, Distance>& _Right
);
template<class CharType, class Tr>
bool operator==(
const istreambuf_iterator<CharType, Traits>& _Left,
const istreambuf_iterator<CharType, Traits>& _Right
);
Parameters
_Left
An object of type iterator._Right
An object of type iterator.
Return Value
true if the iterator objects are equal; false if the iterator objects are not equal.
Remarks
One iterator object is equal to another if they address the same elements in a container. If two iterators point to different elements in a container, then they are not equal.
The first two template operators return true only if both _Left and _Right store the same iterator. The third template operator returns true only if both _Left and _Right store the same stream pointer. The fourth template operator returns _Left.equal (_Right).
Example
// iterator_op_eq.cpp
// compile with: /EHsc
#include <iterator>
#include <vector>
#include <iostream>
int main( )
{
using namespace std;
int i;
vector<int> vec;
for ( i = 1 ; i < 6 ; ++i )
{
vec.push_back ( 2 * i );
}
vector <int>::iterator vIter;
cout << "The vector vec is: ( ";
for ( vIter = vec.begin( ) ; vIter != vec.end( ); vIter++)
cout << *vIter << " ";
cout << ")." << endl;
// Initializing reverse_iterators to the last element
vector <int>::reverse_iterator rVPOS1 = vec.rbegin ( ),
rVPOS2 = vec.rbegin ( );
cout << "The iterator rVPOS1 initially points to the first "
<< "element\n in the reversed sequence: "
<< *rVPOS1 << "." << endl;
if ( rVPOS1 == rVPOS2 )
cout << "The iterators are equal." << endl;
else
cout << "The iterators are not equal." << endl;
rVPOS1++;
cout << "The iterator rVPOS1 now points to the second "
<< "element\n in the reversed sequence: "
<< *rVPOS1 << "." << endl;
if ( rVPOS1 == rVPOS2 )
cout << "The iterators are equal." << endl;
else
cout << "The iterators are not equal." << endl;
}
The vector vec is: ( 2 4 6 8 10 ). The iterator rVPOS1 initially points to the first element in the reversed sequence: 10. The iterators are equal. The iterator rVPOS1 now points to the second element in the reversed sequence: 8. The iterators are not equal.
Requirements
Header: <iterator>
Namespace: std