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C++ Queue size() Function

C++ Queue size() Function with Examples on tutorial for beginners and professionals, constructor, emplace(), empty(), pop(), push(), back(), size(), top(), object and class, exception, static, structs, inheritance, aggregation etc.

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C++ Queue size() Function

C++ Queue size() function returns the number of queue elements. The number of elements in the queue is an actual representation of the size, and the size value is given by this function.

Syntax

size_type size() const;

Parameters

The function does not take any parameter, and it just returns the queue size.

Return value

The number of elements in the queue is returned. In other words, the size of the queue is given.

Example 1

#include <iostream>
#include <queue>
int main()
{
	std::queue<int> newqueue;
	std::cout<< "0. size: "<< newqueue.size();
	for(int j=0; j<5; j++)
	newqueue.push(j);
	std::cout<<"\n";
	std::cout << "1. size: " << newqueue.size();
	newqueue.pop();
	std::cout<<"\n";
	std::cout << "2. size: "<< newqueue.size();
	return 0;
}

Output:

0.size: 0
1.size: 5
2.size: 4

Example 2

#include <iostream>
#include <queue>
using namespace std;
int main()
{
	int result = 0;
	queue<int> newqueue;
	newqueue.push(12);
	newqueue.push(24);
	newqueue.push(36);
	newqueue.push(48);
	cout<<"Size of the queue is ";
	cout<<newqueue.size();
	return 0;
}

Output:

Size of queue is 4

Complexity

The complexity is constant.

Data races

The function accesses the container. By accessing the container the size of the queue is evaluates.

Exception Safety

Guarantee as equivalent to the operations that are performed on the underlying container object is provided.

Next TopicC++ Queue




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