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-rw-r--r--include/libcamera/signal.h67
1 files changed, 59 insertions, 8 deletions
diff --git a/include/libcamera/signal.h b/include/libcamera/signal.h
index c8f3243e..11ffb857 100644
--- a/include/libcamera/signal.h
+++ b/include/libcamera/signal.h
@@ -8,6 +8,8 @@
#define __LIBCAMERA_SIGNAL_H__
#include <list>
+#include <tuple>
+#include <type_traits>
#include <vector>
#include <libcamera/object.h>
@@ -27,6 +29,9 @@ public:
void *obj() { return obj_; }
bool isObject() const { return isObject_; }
+ void activatePack(void *pack);
+ virtual void invokePack(void *pack) = 0;
+
protected:
void *obj_;
bool isObject_;
@@ -35,24 +40,70 @@ protected:
template<typename... Args>
class SlotArgs : public SlotBase
{
+private:
+#ifndef __DOXYGEN__
+ /*
+ * This is a cheap partial implementation of std::integer_sequence<>
+ * from C++14.
+ */
+ template<int...>
+ struct sequence {
+ };
+
+ template<int N, int... S>
+ struct generator : generator<N-1, N-1, S...> {
+ };
+
+ template<int... S>
+ struct generator<0, S...> {
+ typedef sequence<S...> type;
+ };
+#endif
+
+ using PackType = std::tuple<typename std::remove_reference<Args>::type...>;
+
+ template<int... S>
+ void invokePack(void *pack, sequence<S...>)
+ {
+ PackType *args = static_cast<PackType *>(pack);
+ invoke(std::get<S>(*args)...);
+ delete args;
+ }
+
public:
SlotArgs(void *obj, bool isObject)
: SlotBase(obj, isObject) {}
- virtual void invoke(Args... args) = 0;
+ void invokePack(void *pack) override
+ {
+ invokePack(pack, typename generator<sizeof...(Args)>::type());
+ }
-protected:
- friend class Signal<Args...>;
+ virtual void activate(Args... args) = 0;
+ virtual void invoke(Args... args) = 0;
};
template<typename T, typename... Args>
class SlotMember : public SlotArgs<Args...>
{
public:
+ using PackType = std::tuple<typename std::remove_reference<Args>::type...>;
+
SlotMember(T *obj, bool isObject, void (T::*func)(Args...))
: SlotArgs<Args...>(obj, isObject), func_(func) {}
- void invoke(Args... args) { (static_cast<T *>(this->obj_)->*func_)(args...); }
+ void activate(Args... args)
+ {
+ if (this->isObject_)
+ SlotBase::activatePack(new PackType{ args... });
+ else
+ (static_cast<T *>(this->obj_)->*func_)(args...);
+ }
+
+ void invoke(Args... args)
+ {
+ (static_cast<T *>(this->obj_)->*func_)(args...);
+ }
private:
friend class Signal<Args...>;
@@ -66,7 +117,8 @@ public:
SlotStatic(void (*func)(Args...))
: SlotArgs<Args...>(nullptr, false), func_(func) {}
- void invoke(Args... args) { (*func_)(args...); }
+ void activate(Args... args) { (*func_)(args...); }
+ void invoke(Args... args) {}
private:
friend class Signal<Args...>;
@@ -186,9 +238,8 @@ public:
* disconnect operation, invalidating the iterator.
*/
std::vector<SlotBase *> slots{ slots_.begin(), slots_.end() };
- for (SlotBase *slot : slots) {
- static_cast<SlotArgs<Args...> *>(slot)->invoke(args...);
- }
+ for (SlotBase *slot : slots)
+ static_cast<SlotArgs<Args...> *>(slot)->activate(args...);
}
};