Performance

The reason for using the parallel STL is performance. Here are the first numbers.

Performance of the various execution policies

 1 // parallelSTLPerformance.cpp
 2 
 3 #include <algorithm>
 4 #include <cmath>
 5 #include <chrono>
 6 #include <execution>
 7 #include <iostream>
 8 #include <random>
 9 #include <string>
10 #include <vector>
11 
12 constexpr long long size = 500'000'000;  
13   
14 const double pi = std::acos(-1);
15 
16 template <typename Func>
17 void getExecutionTime(const std::string& title, Func func){
18     
19      const auto sta = std::chrono::steady_clock::now();
20      func();
21      const std::chrono::duration<double> dur = std::chrono::steady_clock::now() - st\
22 a;
23      std::cout << title << ": " << dur.count() << " sec. " << std::endl;
24      
25 }
26     
27 int main(){
28 
29     std::cout << std::endl;...