CallbackSet.h

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#pragma once
 
 
#include "objects/containers/Array.h"
#include "objects/wrappers/Function.h"
#include "objects/wrappers/SharedToken.h"
 
NAMESPACE_SPH_BEGIN
 
template <typename TSignature>
class CallbackSet;
 
template <typename... TArgs>
class CallbackSet<void(TArgs...)> {
public:
    struct Callback {
        Function<void(TArgs...)> functor;
        WeakToken owner;
    };
 
 
private:
    Array<Callback> callbacks;
 
public:
    CallbackSet() = default;
 
    CallbackSet(const CallbackSet& other)
        : callbacks(other.callbacks.clone()) {}
 
    void insert(const SharedToken& owner, const Function<void(TArgs...)>& functor) {
        if (owner) {
            callbacks.push(Callback{ functor, owner });
        }
    }
 
    void operator()(TArgs... args) const {
        for (const Callback& callback : callbacks) {
            if (auto owner = callback.owner.lock()) {
                callback.functor(args...);
            }
        }
    }
 
    Iterator<const Callback> begin() const {
        return callbacks.begin();
    }
 
    Iterator<const Callback> end() const {
        return callbacks.end();
    }
 
    Size size() const {
        return callbacks.size();
    }
 
    bool empty() const {
        return callbacks.empty();
    }
};
 
template <typename... TArgs>
class CallbackSet<Function<void(TArgs...)>> : public CallbackSet<void(TArgs...)> {};
 
NAMESPACE_SPH_END