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C++ Stack Library - operator== Function
Description
The C++ function std::stack::operator== tests whether two stacks are equal or not.
Declaration
Following is the declaration for std::stack::operator== function form std::stack header.
C++98
template <class T, class Container> bool operator== (const stack<T,Container>& stack1, const stack<T,Container>& stack2);
Parameters
stack1 − First stack.
stack2 − Second stack.
Return value
Returns true if both stacks are equal otherwise false.
Exceptions
This function never throws exception.
Time complexity
Linear i.e. O(n)
Example
The following example shows the usage of std::stack::operator== function.
#include <iostream> #include <stack> using namespace std; int main(void) { stack<int> s1; stack<int> s2; for (int i = 0; i < 5; ++i) { s1.push(i + 1); s2.push(i + 1); } if (s1 == s2) cout << "Both stacks are equal." << endl; s1.push(6); if (!(s1 == s2)) cout << "Both stacks are not equal." << endl; return 0; }
Let us compile and run the above program, this will produce the following result −
Both stacks are equal. Both stacks are not equal.
stack.htm
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