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What Is List (std::list) In Modern C++?

What Is List stdlist In Modern C++

Containers are powerful data storage arrays in modern C++ and they are very useful to iterate and search data with their amazing methods and properties. A container is a holder object that stores data elements (a collection of data objects). std::vector, std::array, std::set are these kinds of containers. There is another useful container, in this post, we explain what std::list is. Before that let’s remind ourselves what containers are in C++ programming and what are their types.

What is a container in modern C++?

Containers are modern data storage arrays in modern C++ and they are very useful to iterate and search data with their amazing methods and properties.

A container is a holder object that stores data elements (a collection of data objects). They are implemented as a class template to define objects that can be used with modern rules of C++ (The rule of 6), they allow great flexibility in the different data types supported as elements, they can be used with int, float, double, etc. or with struct types, they can be used with other modern types of C++, lambdas and templates. Thus, the developer can create different data sets in memory, these can be static or dynamic, they are safe and optimized well.

What are the basic container types modern C++?

The C++ Standards library defines 4 container types. 

  • Sequence Containers ( vector, array, deque, list, forward_list )
  • Associative Containers ( map, multimap, set, multiset )
  • Unordered Associative Containers ( unordered_map, unordered_multimap, unordered_set, unordered_multiset )
  • Container Adapters  ( stack, queue, priority_queue )

If you want to learn more about these each type, here are some basic details,

What is std::list in modern C++?

The list (std::list) is a sequence container class template defined in <list> header that supports non-contiguous memory allocation. They are slower than the std::vector but their insert and delete operations are faster. They do not support fast random access. They support bidirectional iteration, and they use much more memory space. They are easy to insert or delete elements from anywhere in the container.

In general, std::list is defined as below,

Since C++17, std::list is improved and defined as below.

Is there a simple std::list example in modern C++?

Here is a simple std::list declaration example in C++.

we can define its member in definition as below.

Or we can use push_back push_front methods to add new members on runtime.

What is std::list in modern C++?

Here is a full example about std::list

For more new details, you can check here, https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0646r1.pdf

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About author

Dr. Yilmaz Yoru has 35+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux, and some other operating systems. He graduated and received his MSc and PhD degrees from the Department of Mechanical Engineering of Eskisehir Osmangazi University. He is the founder and CEO of ESENJA LLC Company. His interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
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