// ------------------------------------------------------------------------------------------------
void Signal::DisconnectFunc(Function & func)
{
// Don't attempt to search anything if there's no head
if (m_Head == nullptr)
{
return;
}
const SQHash hash = Slot{NullObject(), func}.mFuncHash;
// Walk down the chain and remove the matching nodes
for (Slot * node = m_Head, * next = nullptr; node != nullptr; node = next)
{
// Grab the next node upfront
next = node->mNext;
// Is this our node?
if (node->mFuncHash == hash)
{
// Is this the head?
if (node == m_Head)
{
m_Head = next; // Move the head to the next one
}
// Detach it from the chain
node->Detach();
// Delete the node instance
delete node;
}
}
}
// ------------------------------------------------------------------------------------------------
void Signal::Tail(Object & env, Function & func)
{
// Don't attempt to search anything if there's no head
if (m_Head == nullptr)
{
m_Head = new Slot(env, func, nullptr);
// We're done here
return;
}
const Slot slot{env, func};
// Don't attempt to search anything if there's only one element
if (m_Head->mNext == nullptr)
{
// Is it already inserted?
if (*m_Head != slot)
{
m_Head->mNext = new Slot(env, func, nullptr);
// Link with the head
m_Head->mNext->mPrev = m_Head;
}
// We're done here
return;
}
// Grab the head node
Slot * node = m_Head, * prev = nullptr;
// Walk down the chain and find a matching node
for (; node != nullptr; prev = node, node = node->mNext)
{
if (*node == slot)
{
break; // Found it
}
}
// Have we found anything?
if (node == nullptr)
{
// Create the slot now
node = new Slot(env, func, nullptr);
}
else
{
// Walk down the chain until the end
while (prev->mNext != nullptr)
{
prev = prev->mNext;
}
// Finally, detach the node from it's current position
node->Detach();
}
// Knowing 'prev' points to last element
node->AttachPrev(prev);
}
int main(int argc, char* argv[])
{
Classe myClass;
Slot<int, float> slot; //declaring a slot that holds functions and functors which receive 2 parameters, an int and a float
Signal<int, float> signal; //declares a signal compatible with the previous slot
slot.Attach(&myClass, &Classe::miMethod); //adds to the slot a member method of myClass
slot.Attach(&myFloat); //adds to the
slot.Attach(&Classe::StaticMethod); //adds a static method to the slot
signal.Connect(&slot); //connects the signal and the slot, so that firing the signal will also fire all the elements connected to the slot
signal(2, 3); //fires the signal, which will fire the three elements connected to the slot
slot.Detach(&myFloat); //detaches the function from the slot
signal(2, 4); //now, firing the signal will only fire two elements of the slot
slot.Detach(&myClass, &Classe::miMethod); //detaches the member of myClass
signal(2, 5); //fires the only one element of the slot
slot.Detach(&myClass, &Classe::miMethod2); //tryies to detach an element that is not present in the slot. Nothing happens
signal(2, 6);
slot.Detach(&Classe::StaticMethod); //detaches the last element of the signal
signal(2, 7); //slot empty, nothing is fired
//signal and slot for members with empty parameter list
Signal<> empParamSignal;
Slot<> empParamSlot;
empParamSlot.Attach(&empty);
empParamSignal.Connect(&empParamSlot);
empParamSignal();
return 0;
}