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core: make keep_doing() propagate failure

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This commit is contained in:
Tomasz Grabiec
2014-10-14 13:49:21 +02:00
parent ca077f33ef
commit 454ee88bb6
1 changed files with 8 additions and 5 deletions
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13
core/async-action.hh
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@@ -45,17 +45,20 @@ future<> do_until(StopCondition&& stop_cond, AsyncAction&& action) {
return f;
}
// Invoke given action undefinitely. Next invocation starts when previous completes or fails.
// Invoke given action until it fails.
template<typename AsyncAction>
static inline
void keep_doing(AsyncAction&& action) {
future<> keep_doing(AsyncAction&& action) {
while (true) {
auto f = action();
if (!f.available()) {
f.then([action = std::forward<AsyncAction>(action)] () mutable {
keep_doing(std::forward<AsyncAction>(action));
return f.then([action = std::forward<AsyncAction>(action)] () mutable {
return keep_doing(std::forward<AsyncAction>(action));
});
return;
}
if (f.failed()) {
return std::move(f);
}
}
}