117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
// This example shows how to compose a taskflow
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#include <taskflow/taskflow.hpp>
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void composition_example_1() {
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std::cout << "Composition example 1\n";
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tf::Executor executor;
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// f1 has three independent tasks
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tf::Taskflow f1("F1");
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auto f1A = f1.emplace([](){ std::cout << "F1 TaskA\n"; });
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auto f1B = f1.emplace([](){ std::cout << "F1 TaskB\n"; });
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auto f1C = f1.emplace([](){ std::cout << "F1 TaskC\n"; });
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f1A.name("f1A");
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f1B.name("f1B");
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f1C.name("f1C");
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f1A.precede(f1C);
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f1B.precede(f1C);
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// f2A ---
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// |----> f2C ----> f1_module_task ----> f2D
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// f2B ---
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tf::Taskflow f2("F2");
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auto f2A = f2.emplace([](){ std::cout << " F2 TaskA\n"; });
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auto f2B = f2.emplace([](){ std::cout << " F2 TaskB\n"; });
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auto f2C = f2.emplace([](){ std::cout << " F2 TaskC\n"; });
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auto f2D = f2.emplace([](){ std::cout << " F2 TaskD\n"; });
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f2A.name("f2A");
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f2B.name("f2B");
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f2C.name("f2C");
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f2D.name("f2D");
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f2A.precede(f2C);
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f2B.precede(f2C);
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tf::Task f1_module_task = f2.composed_of(f1);
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f1_module_task.name("module");
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f2C.precede(f1_module_task);
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f1_module_task.precede(f2D);
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f2.dump(std::cout);
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executor.run_n(f2, 3).get();
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}
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void composition_example_2() {
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std::cout << "Composition example 2\n";
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tf::Executor executor;
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// f1 has two independent tasks
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tf::Taskflow f1("F1");
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auto f1A = f1.emplace([&](){ std::cout << "F1 TaskA\n"; });
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auto f1B = f1.emplace([&](){ std::cout << "F1 TaskB\n"; });
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f1A.name("f1A");
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f1B.name("f1B");
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// f2A ---
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// |----> f2C
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// f2B ---
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//
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// f1_module_task
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tf::Taskflow f2("F2");
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auto f2A = f2.emplace([&](){ std::cout << " F2 TaskA\n"; });
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auto f2B = f2.emplace([&](){ std::cout << " F2 TaskB\n"; });
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auto f2C = f2.emplace([&](){ std::cout << " F2 TaskC\n"; });
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f2A.name("f2A");
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f2B.name("f2B");
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f2C.name("f2C");
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f2A.precede(f2C);
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f2B.precede(f2C);
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f2.composed_of(f1).name("module_of_f1");
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// f3 has a module task (f2) and a regular task
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tf::Taskflow f3("F3");
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f3.composed_of(f2).name("module_of_f2");
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f3.emplace([](){ std::cout << " F3 TaskA\n"; }).name("f3A");
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// f4: f3_module_task -> f2_module_task
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tf::Taskflow f4;
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f4.name("F4");
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auto f3_module_task = f4.composed_of(f3).name("module_of_f3");
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auto f2_module_task = f4.composed_of(f2).name("module_of_f2");
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f3_module_task.precede(f2_module_task);
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f4.dump(std::cout);
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executor.run_until(
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f4,
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[iter = 1] () mutable { std::cout << '\n'; return iter-- == 0; },
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[](){ std::cout << "First run_until finished\n"; }
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).get();
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executor.run_until(
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f4,
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[iter = 2] () mutable { std::cout << '\n'; return iter-- == 0; },
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[](){ std::cout << "Second run_until finished\n"; }
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);
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executor.run_until(
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f4,
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[iter = 3] () mutable { std::cout << '\n'; return iter-- == 0; },
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[](){ std::cout << "Third run_until finished\n"; }
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).get();
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}
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int main(){
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composition_example_1();
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composition_example_2();
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return 0;
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}
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