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cpp-taskflow/example/composition.cpp at master · 19317362/cpp-taskflow · GitHub
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//
2019/03/12 - created by Chun-Xun Lin
//
- added an example showing how to use framework decomposition
#
include
<
taskflow/taskflow.hpp
>
//
the only include you need
void
composition_example_1
(tf::Taskflow& tf) {
std::cout <<
'
\n
'
;
std::cout <<
"
Composition example 1
\n
"
;
//
f1 has three independent tasks
tf::Framework f1;
auto
[f1A, f1B, f1C] = f1.
name
(
"
F1
"
).
emplace
(
[&](){ std::cout <<
"
F1 TaskA
\n
"
; },
[&](){ std::cout <<
"
F1 TaskB
\n
"
; },
[&](){ std::cout <<
"
F1 TaskC
\n
"
; }
);
f1A.
name
(
"
f1A
"
);
f1B.
name
(
"
f1B
"
);
f1C.
name
(
"
f1C
"
);
f1A.
precede
(f1C);
f1B.
precede
(f1C);
//
f2A ---
//
|----> f2C ----> f1_module_task ----> f2D
//
f2B ---
tf::Framework f2;
auto
[f2A, f2B, f2C, f2D] = f2.
name
(
"
F2
"
).
emplace
(
[&](){ std::cout <<
"
F2 TaskA
\n
"
; },
[&](){ std::cout <<
"
F2 TaskB
\n
"
; },
[&](){ std::cout <<
"
F2 TaskC
\n
"
; },
[&](){ std::cout <<
"
F2 TaskD
\n
"
; }
);
f2A.
name
(
"
f2A
"
);
f2B.
name
(
"
f2B
"
);
f2C.
name
(
"
f2C
"
);
f2D.
name
(
"
f2D
"
);
f2A.
precede
(f2C);
f2B.
precede
(f2C);
auto
f1_module_task = f2.
composed_of
(f1).
name
(
"
module
"
);
f2C.
precede
(f1_module_task);
f1_module_task.
precede
(f2D);
f2.
dump
(std::cout);
tf.
run_n
(f2,
3
).
get
();
}
void
composition_example_2
(tf::Taskflow& tf) {
std::cout <<
'
\n
'
;
std::cout <<
"
Composition example 2
\n
"
;
//
f1 has two independent tasks
tf::Framework f1;
auto
[f1A, f1B] = f1.
name
(
"
F1
"
).
emplace
(
[&](){ std::cout <<
"
F1 TaskA
\n
"
; },
[&](){ std::cout <<
"
F1 TaskB
\n
"
; }
);
f1A.
name
(
"
f1A
"
);
f1B.
name
(
"
f1B
"
);
//
f2A ---
//
|----> f2C
//
f2B ---
//
//
f1_module_task
tf::Framework f2;
auto
[f2A, f2B, f2C] = f2.
name
(
"
F2
"
).
emplace
(
[&](){ std::cout <<
"
F2 TaskA
\n
"
; },
[&](){ std::cout <<
"
F2 TaskB
\n
"
; },
[&](){ std::cout <<
"
F2 TaskC
\n
"
; }
);
f2A.
name
(
"
f2A
"
);
f2B.
name
(
"
f2B
"
);
f2C.
name
(
"
f2C
"
);
f2A.
precede
(f2C);
f2B.
precede
(f2C);
f2.
composed_of
(f1);
//
f3 has a module task (f2) and a regular task
tf::Framework f3;
f3.
name
(
"
F3
"
);
f3.
composed_of
(f2);
f3.
emplace
([](){ std::cout <<
"
F3 TaskA
\n
"
; }).
name
(
"
f3A
"
);
//
f4: f3_module_task -> f2_module_task
tf::Framework f4;
f4.
name
(
"
F4
"
);
auto
f3_module_task = f4.
composed_of
(f3);
auto
f2_module_task = f4.
composed_of
(f2);
f3_module_task.
precede
(f2_module_task);
f4.
dump
(std::cout);
tf.
run_until
(f4, [iter =
1
] ()
mutable
{ std::cout <<
'
\n
'
;
return
iter-- ==
0
; }, [](){
std::cout <<
"
First run_until finished
\n
"
;
}).
get
();
tf.
run_until
(f4, [iter =
2
] ()
mutable
{ std::cout <<
'
\n
'
;
return
iter-- ==
0
; }, [](){
std::cout <<
"
Second run_until finished
\n
"
;
});
tf.
run_until
(f4, [iter =
3
] ()
mutable
{ std::cout <<
'
\n
'
;
return
iter-- ==
0
; }, [](){
std::cout <<
"
Third run_until finished
\n
"
;
}).
get
();
}
int
main
(){
tf::Taskflow taskflow;
composition_example_1
(taskflow);
composition_example_2
(taskflow);
return
0
;
}
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