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Learn To Sort std::array With std::sort Parallel STL Sorting Algorithm In C++

C++ has really great features that comes with its modern libraries. In C++, STL Standard Template Library has many algorithms for some operations like searching, counting, and manipulation of ranges and their elements. C++17 has a new feature that you can sort vectors with std::sort Parallel STL Algorithm. Vectors and arrays can be used and sorted by std::sort Parallel STL Algorithm with an appropriate C++ Development Tool.

What is std::sort algorithm in C++?

std::sort Parallel STL Algorithm sorts the elements in the range from the first member to the alst memeber in non-descending order. During the order of equal elements, it is not guaranteed to be preserved.

Syntax for the std::sort algorithm can be described as below,

As an ExecutionPolicy std::execution::seq is used for the sequential execution, std::execution::par is used for the parallel execution . In general, there are 3 ExecutionPolicy you can use here,

  • std::execution::seq
  • std::execution::par
  • std::execution::par_unseq

Now let’s see how we can use std::sort() with std::array in examples,

How to sort std::array with parallel STL sorting algorithm in C++?

In C++, after the C++11 standards, an array (std::array) is a container that encapsulates fixed size arrays. This is a C++11 array that can be used in other C++ versions like C++14, C++17, C++20, etc. You just need to include <array> header as below.

std::array is one of the sequence containers of Containers Library which also has vector, deque, list, set, map, etc. std::array is an aggregate type with the same semantics as a struct holding a C style arrays as its only non-static data member. Unlike a C-style array, std::array doesn’t decay a pointer automatically. As an aggregate type, it can be initialized with aggregate-initialization given at most N initializers that are convertible to Type. For example, a std::array can be used as below,

we can create an ar array with 100 members as bleow,

simply we can sort this array as below,

Is there a full example of how to sort std::array with parallel STL sorting algorithm?

Now let’s see how we can sort a lot of vector elements with std::sort algorithm.

We can add execution policy with std::execution::par execution policy as below,

Note that, in C++ std::array is on the stack, in other words it has less limits than vectors.

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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 was born in 1974, Eskisehir-Turkey, started coding in college and graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. He worked as a research assistant at the same university for more than 10 years. He received his MSc and PhD degrees from the same department at the same university. Since 2012, he is the founder and CEO of Esenja LLC Company. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
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