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C++ Queue Library - operator< Function
Description
The C++ function std::queue::operator< tests whether first queue is less than other or not. Comparison is done by applying corresponding operator to the underlying container.
Declaration
Following is the declaration for std::queue::operator< function form std::queue header.
C++98
template <class T, class Container> bool operator< (const queue<T,Container>& q1, const queue<T,Container>& q2);
Parameters
q1 − First queue object.
q2 − Second queue object.
Return value
Returns true if first queue is less than second otherwise false.
Exceptions
This member function never throws exception.
Time complexity
Linear i.e. O(n)
Example
The following example shows the usage of std::queue::operator< function.
#include <iostream> #include <queue> using namespace std; int main(void) { queue<int> q1, q2; for (int i = 0; i < 5; ++i) q1.push(i); for (int i = 0; i < 15; ++i) q2.push(i); if (q1 < q2) cout << "q1 is less than q2." << endl; q2.swap(q1); if (!(q1 < q2)) cout << "q1 is not less than q2." << endl; return 0; }
Let us compile and run the above program, this will produce the following result −
q1 is less than q2. q1 is not less than q2.
queue.htm
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