cpp-taskflow/examples/dependent_async_algorithm.cpp at master · feiyunwill/cpp-taskflow · GitHub

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/**

This program demonstrates how to use dependent async tasks to create

algorithm tasks.

#include <taskflow/taskflow.hpp>

#include <taskflow/algorithm/for_each.hpp>

#include <taskflow/algorithm/transform.hpp>

#include <taskflow/algorithm/reduce.hpp>

int main(){

const size_t N = 65536;

tf::Executor executor;

int sum{1};

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

// for-each

tf::AsyncTask A = executor.silent_dependent_async(tf::make_for_each_task(

data.begin(), data.end(), [](int& i){ i = 1; }

));

// transform

tf::AsyncTask B = executor.silent_dependent_async(tf::make_transform_task(

data.begin(), data.end(), data.begin(), [](int& i) { return i*2; }

), A);

// reduce

tf::AsyncTask C = executor.silent_dependent_async(tf::make_reduce_task(

data.begin(), data.end(), sum, std::plus<int>{}

), B);

// wait for all async task to complete

executor.wait_for_all();

// verify the result

if(sum != N*2 + 1) {

throw std::runtime_error("INCORRECT RESULT");

}

else {

std::cout << "CORRECT RESULT\n";

}

return 0;

}

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