.clear()

In C++, the .clear() method removes all elements from a given deque container, leaving the container with a size of 0.

Syntax

dequeName.clear();

• dequeName: The name of the deque container from which all elements will be removed.

Example

The example below showcases the use of the .clear() method:

#include <iostream>
#include <deque>

int main() {
  // Create a deque of integers
  std::deque<int> numbers;

  // Add elements to the deque
  numbers.push_back(50);
  numbers.push_back(100);
  numbers.push_back(150);
  numbers.push_back(200);

  // Display the elements of the deque before clearing
  std::cout << "My deque contains: ";
  for (int num : numbers) {
    std::cout << num << " ";
  }

  // Clear all elements from the deque
  numbers.clear();
  std::cout << std::endl;

  numbers.push_back(200);

  // Display the elements of the deque after clearing and adding a new element
  std::cout << "My deque contains: ";
  for (int num : numbers) {
    std::cout << num << " ";
  }

  std::cout << std::endl;

  return 0;
}

The above code generates the following output:

My deque contains: 50 100 150 200
My deque contains: 200

Codebyte Example

The following codebyte demonstrates the use of the .clear() method, which removes all elements from the deque before adding a new element:

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