operator== (<utility>)
Tests if the pair object on the left side of the operator is equal to the pair object on the right side.
template<class Type1, class Type2>
bool operator==(
const pair<Type1, Type2>& _Left,
const pair<Type1, Type2>& _Right
);
Parameters
_Left
An object of type pair._Right
An object of type pair.
Return Value
true if the pairs are equal; false if the pairs are not equal.
Remarks
One pair is equal to another pair if each of their respective elements is equal. The function returns _Left.first == _Right.first && _Left.second == _Right.second. Two pairs are unequal if either the first or the second element of one is not equal to the corresponding element of the other pair.
Example
// utility_op_eq.cpp
// compile with: /EHsc
#include <utility>
#include <iomanip>
#include <iostream>
int main( )
{
using namespace std;
pair <int, double> p1, p2, p3;
p1 = make_pair ( 10, 1.11e-1 );
p2 = make_pair ( 1000, 1.11e-3 );
p3 = make_pair ( 10, 1.11e-1 );
cout.precision ( 3 );
cout << "The pair p1 is: ( " << p1.first << ", "
<< p1.second << " )." << endl;
cout << "The pair p2 is: ( " << p2.first << ", "
<< p2.second << " )." << endl;
cout << "The pair p3 is: ( " << p3.first << ", "
<< p3.second << " )." << endl << endl;
if ( p1 == p2 )
cout << "The pairs p1 and p2 are equal." << endl;
else
cout << "The pairs p1 and p2 are not equal." << endl;
if ( p1 == p3 )
cout << "The pairs p1 and p3 are equal." << endl;
else
cout << "The pairs p1 and p3 are not equal." << endl;
}
Output
The pair p1 is: ( 10, 0.111 ). The pair p2 is: ( 1000, 0.00111 ). The pair p3 is: ( 10, 0.111 ). The pairs p1 and p2 are not equal. The pairs p1 and p3 are equal.
Requirements
Header: <utility>
Namespace: std