// This program demonstrates loop-based parallelism using:

// + STL-styled iterators

// + plain integral indices

#include <taskflow/taskflow.hpp>

#include <taskflow/algorithm/for_each.hpp>

// Procedure: for_each

void for_each(int N) {

tf::Executor executor;

tf::Taskflow taskflow;

std::vector<int> range(N);

std::iota(range.begin(), range.end(), 0);

taskflow.for_each(range.begin(), range.end(), [&] (int i) {

printf("for_each on container item: %d\n", i);

});

executor.run(taskflow).get();

taskflow.dump(std::cout);

}

// Procedure: for_each_index

void for_each_index(int N) {

tf::Executor executor;

tf::Taskflow taskflow;

// [0, N) with step size 2

taskflow.for_each_index(0, N, 2, [] (int i) {

printf("for_each_index on index: %d\n", i);

});

executor.run(taskflow).get();

taskflow.dump(std::cout);

}

// ----------------------------------------------------------------------------

// Function: main

int main(int argc, char* argv[]) {

if(argc != 2) {

std::cerr << "Usage: ./parallel_for num_iterations" << std::endl;

std::exit(EXIT_FAILURE);

}

for_each(std::atoi(argv[1]));

for_each_index(std::atoi(argv[1]));

return 0;

}