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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