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Rework iothread_perform for void return types

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Need to use a template specialization so we don't try to create
a variable of type void
This commit is contained in:
ridiculousfish 2017-01-23 13:56:43 -08:00
parent 699d294ac1
commit ac9a0f0dbf
1 changed files with 24 additions and 6 deletions
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30
src/iothread.h
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@ -29,13 +29,31 @@ void iothread_drain_all(void);
int iothread_perform(std::function<void(void)> &&func,
std::function<void(void)> &&completion = std::function<void(void)>());
// Variant that allows computing a value in func, and then passing it to the completion handler
// Template helpers
template<typename T>
int iothread_perform(std::function<T(void)> &&handler, std::function<void(T)> &&completion) {
T *result = new T();
return iothread_perform([=](){ *result = handler(); },
[=](){ completion(std::move(*result)); delete result; }
);
struct _iothread_trampoline {
template<typename HANDLER, typename COMPLETION>
static int perform(const HANDLER &handler, const COMPLETION &completion) {
T *result = new T();
return iothread_perform([=](){ *result = handler(); },
[=](){ completion(std::move(*result)); delete result; });
}
};
// Void specialization
template<>
struct _iothread_trampoline<void> {
template<typename HANDLER, typename COMPLETION>
static int perform(const HANDLER &handler, const COMPLETION &completion) {
return iothread_perform(handler, completion);
}
};
// Variant that allows computing a value in func, and then passing it to the completion handler
template<typename HANDLER, typename COMPLETION>
int iothread_perform(const HANDLER &handler, const COMPLETION &completion) {
return _iothread_trampoline<decltype(handler())>::perform(handler, completion);
}
/// Legacy templates