List header file in C++

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The list header file in C++ is a powerful tool for managing collections of data in an ordered manner. It facilitates the creation and manipulation of doubly-linked lists, a fundamental data structure. With <list>, you can effortlessly insert, remove, and iterate through elements, making it particularly useful when dynamic resizing and efficient insertions and deletions are essential. Transitioning from arrays or vectors to <list> enables more flexibility and efficient memory management.

This header file provides a wealth of functionalities, from sorting and merging lists to performing custom operations on data structures. Whether you’re handling complex data structures or simplifying everyday tasks, <list> is a versatile and indispensable component of the C++ Standard Library, streamlining your coding experience and enhancing the efficiency of your programs.

How to include the list header file in your code?

To use the list header file in your C++ code, Add the <list> header file at the top of your C++ source code file using the #include preprocessor directive.

#include <list>

Functions in list header file

The <list> header file in C++ provides a variety of functions and methods for working with linked lists. Here’s a list of some common functions along with code examples and expected outputs:

push_back()

Adds an element to the end of the list.

#include <iostream>
#include <list>

int main() {
    std::list<int> myList;

    myList.push_back(42);
    myList.push_back(10);

    for (const int& item : myList) {
        std::cout << item << " ";
    }

    return 0;
}

push_front()

Adds an element to the beginning of the list.

std::list<int> myList;

myList.push_front(42);
myList.push_front(10);

for (const int& item : myList) {
    std::cout << item << " ";
}

pop_back() & pop_front()

  • Removes the last element from the list.
  • Removes the first element from the list.
std::list<int> myList;

myList.push_back(42);
myList.push_back(10);

myList.pop_back();
myList.pop_front();

for (const int& item : myList) {
    std::cout << item << " ";
}

size()

Returns the number of elements in the list.

std::list<int> myList;

myList.push_back(42);
myList.push_back(10);

std::cout << "Size of the list: " << myList.size() << std::endl;

sort()

Sorts the elements in the list.

std::list<int> myList;

myList.push_back(42);
myList.push_back(10);
myList.push_back(35);

myList.sort();

for (const int& item : myList) {
    std::cout << item << " ";
}

These are just a few of the functions and methods available in the <list> header file. You can explore more functions and their usage in the C++ Standard Library documentation for <list> and adapt them to your specific needs.

In short, the <list> header file in C++ is super handy for working with lists of stuff. You can add things to the front or end with push_back and push_front. And, if you change your mind, you can remove items with pop_back and pop_front. It’s easy to find out how many things are in your list with size, and you can even sort your list with sort. So, if you need to keep track of things in a certain order, <list> is a great tool to help you do it!

Learn about the <algorithm> header file in C++ Read More.

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