Tests if the stack object on the left side of the operator is equal to stack object on the right side.
bool operator==(
const stack <Type, Container>& _Left,
const stack <Type, Container>& _Right
);
Parameters
_Left
An object of type stack._Right
An object of type stack.
Return Value
true if the stacks or stacks are equal; false if stacks or stacks are not equal.
Remarks
The comparison between stack objects is based on a pairwise comparison of their elements. Two stacks are equal if they have the same number of elements and their respective elements have the same values. Otherwise, they are unequal.
Example
// stack_op_eq.cpp
// compile with: /EHsc
#include <stack>
#include <vector>
#include <iostream>
int main( )
{
using namespace std;
// Declares stacks with vector base containers
stack <int, vector<int> > s1, s2, s3;
// The following would have cause an error because stacks with
// different base containers are not equality comparable
// stack <int, list<int> > s3;
s1.push( 1 );
s2.push( 2 );
s3.push( 1 );
if ( s1 == s2 )
cout << "The stacks s1 and s2 are equal." << endl;
else
cout << "The stacks s1 and s2 are not equal." << endl;
if ( s1 == s3 )
cout << "The stacks s1 and s3 are equal." << endl;
else
cout << "The stacks s1 and s3 are not equal." << endl;
}
The stacks s1 and s2 are not equal. The stacks s1 and s3 are equal.
Requirements
Header: <stack>
Namespace: std