301 lines
8.3 KiB
C++
301 lines
8.3 KiB
C++
/** @example coroutine1.cc
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*
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* An example of using plain coroutines as resumable functions.
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*/
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#include <ostd/io.hh>
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#include <ostd/coroutine.hh>
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using namespace ostd;
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struct foo {
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foo() {
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writeln("<constructing foo>");
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}
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~foo() {
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writeln("<destroying foo>");
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}
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};
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int main() {
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writeln("starting main...");
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for (int steps: range(1, 10)) {
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if (steps != 1) {
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/* separate the results */
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writeln();
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}
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writefln(" main loop: step %s", steps);
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writeln(" coroutine creation");
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coroutine<int(int)> f = [](auto yield, int x) {
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writefln(" coroutine call, first arg: %s", x);
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foo test;
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for (int i: range(x)) {
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writefln(" loop inside coroutine %s", i + 1);
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writefln(" yielding %s...", i * 10);
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auto yr = yield(i * 10);
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writefln(" yielded: %s", yr);
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}
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writeln(" return from coroutine (returning 1234)...");
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return 1234;
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};
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writeln(" coroutine call loop");
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int val = 5;
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for (int i: range(steps)) {
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writeln(" calling into coroutine...");
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int v;
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try {
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v = f(val);
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} catch (coroutine_error const &e) {
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writefln(" coroutine failed: %s", e.what());
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return 0;
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}
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writefln(" called into coroutine which yielded: %s", v);
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writefln(" call loop iteration %s done", i + 1);
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writefln(" coroutine dead: %s", !f);
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val += 5;
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}
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writefln(" main loop iteration %s done", steps);
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}
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writeln("... main has ended");
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}
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/*
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starting main...
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main loop: step 1
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coroutine creation
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coroutine call loop
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calling into coroutine...
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coroutine call, first arg: 5
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<constructing foo>
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loop inside coroutine 1
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yielding 0...
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called into coroutine which yielded: 0
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call loop iteration 1 done
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coroutine dead: false
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main loop iteration 1 done
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<destroying foo>
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main loop: step 2
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coroutine creation
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coroutine call loop
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calling into coroutine...
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coroutine call, first arg: 5
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<constructing foo>
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loop inside coroutine 1
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yielding 0...
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called into coroutine which yielded: 0
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call loop iteration 1 done
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coroutine dead: false
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calling into coroutine...
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yielded: 10
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loop inside coroutine 2
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yielding 10...
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called into coroutine which yielded: 10
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call loop iteration 2 done
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coroutine dead: false
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main loop iteration 2 done
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<destroying foo>
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main loop: step 3
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coroutine creation
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coroutine call loop
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calling into coroutine...
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coroutine call, first arg: 5
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<constructing foo>
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loop inside coroutine 1
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yielding 0...
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called into coroutine which yielded: 0
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call loop iteration 1 done
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coroutine dead: false
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calling into coroutine...
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yielded: 10
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loop inside coroutine 2
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yielding 10...
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called into coroutine which yielded: 10
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call loop iteration 2 done
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coroutine dead: false
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calling into coroutine...
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yielded: 15
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loop inside coroutine 3
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yielding 20...
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called into coroutine which yielded: 20
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call loop iteration 3 done
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coroutine dead: false
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main loop iteration 3 done
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<destroying foo>
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main loop: step 4
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coroutine creation
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coroutine call loop
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calling into coroutine...
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coroutine call, first arg: 5
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<constructing foo>
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loop inside coroutine 1
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yielding 0...
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called into coroutine which yielded: 0
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call loop iteration 1 done
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coroutine dead: false
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calling into coroutine...
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yielded: 10
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loop inside coroutine 2
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yielding 10...
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called into coroutine which yielded: 10
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call loop iteration 2 done
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coroutine dead: false
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calling into coroutine...
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yielded: 15
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loop inside coroutine 3
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yielding 20...
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called into coroutine which yielded: 20
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call loop iteration 3 done
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coroutine dead: false
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calling into coroutine...
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yielded: 20
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loop inside coroutine 4
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yielding 30...
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called into coroutine which yielded: 30
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call loop iteration 4 done
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coroutine dead: false
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main loop iteration 4 done
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<destroying foo>
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main loop: step 5
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coroutine creation
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coroutine call loop
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calling into coroutine...
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coroutine call, first arg: 5
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<constructing foo>
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loop inside coroutine 1
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yielding 0...
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called into coroutine which yielded: 0
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call loop iteration 1 done
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coroutine dead: false
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calling into coroutine...
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yielded: 10
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loop inside coroutine 2
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yielding 10...
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called into coroutine which yielded: 10
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call loop iteration 2 done
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coroutine dead: false
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calling into coroutine...
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yielded: 15
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loop inside coroutine 3
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yielding 20...
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called into coroutine which yielded: 20
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call loop iteration 3 done
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coroutine dead: false
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calling into coroutine...
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yielded: 20
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loop inside coroutine 4
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yielding 30...
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called into coroutine which yielded: 30
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call loop iteration 4 done
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coroutine dead: false
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calling into coroutine...
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yielded: 25
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loop inside coroutine 5
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yielding 40...
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called into coroutine which yielded: 40
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call loop iteration 5 done
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coroutine dead: false
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main loop iteration 5 done
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<destroying foo>
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main loop: step 6
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coroutine creation
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coroutine call loop
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calling into coroutine...
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coroutine call, first arg: 5
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<constructing foo>
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loop inside coroutine 1
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yielding 0...
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called into coroutine which yielded: 0
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call loop iteration 1 done
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coroutine dead: false
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calling into coroutine...
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yielded: 10
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loop inside coroutine 2
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yielding 10...
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called into coroutine which yielded: 10
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call loop iteration 2 done
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coroutine dead: false
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calling into coroutine...
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yielded: 15
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loop inside coroutine 3
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yielding 20...
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called into coroutine which yielded: 20
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call loop iteration 3 done
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coroutine dead: false
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calling into coroutine...
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yielded: 20
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loop inside coroutine 4
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yielding 30...
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called into coroutine which yielded: 30
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call loop iteration 4 done
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coroutine dead: false
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calling into coroutine...
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yielded: 25
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loop inside coroutine 5
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yielding 40...
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called into coroutine which yielded: 40
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call loop iteration 5 done
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coroutine dead: false
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calling into coroutine...
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yielded: 30
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return from coroutine (returning 1234)...
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<destroying foo>
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called into coroutine which yielded: 1234
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call loop iteration 6 done
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coroutine dead: true
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main loop iteration 6 done
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main loop: step 7
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coroutine creation
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coroutine call loop
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calling into coroutine...
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coroutine call, first arg: 5
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<constructing foo>
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loop inside coroutine 1
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yielding 0...
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called into coroutine which yielded: 0
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call loop iteration 1 done
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coroutine dead: false
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calling into coroutine...
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yielded: 10
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loop inside coroutine 2
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yielding 10...
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called into coroutine which yielded: 10
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call loop iteration 2 done
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coroutine dead: false
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calling into coroutine...
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yielded: 15
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loop inside coroutine 3
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yielding 20...
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called into coroutine which yielded: 20
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call loop iteration 3 done
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coroutine dead: false
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calling into coroutine...
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yielded: 20
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loop inside coroutine 4
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yielding 30...
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called into coroutine which yielded: 30
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call loop iteration 4 done
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coroutine dead: false
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calling into coroutine...
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yielded: 25
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loop inside coroutine 5
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yielding 40...
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called into coroutine which yielded: 40
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call loop iteration 5 done
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coroutine dead: false
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calling into coroutine...
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yielded: 30
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return from coroutine (returning 1234)...
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<destroying foo>
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called into coroutine which yielded: 1234
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call loop iteration 6 done
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coroutine dead: true
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calling into coroutine...
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coroutine failed: dead coroutine
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*/
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