Using singals and slots in an efficient way
In my qt c++ application I have 4 interfaces! The first interface takes a value through a line edit and I want to send it to the last interface(4th interface) file(CPP file). Currently I send it using signals and slots through interface 2 and 3 to the 4th interface! Is there any way to send the variable value taken from line edit directly from 1st interface file to the 4th interface file?
I assume you're using a signal forwarding (signal to signal connection).
It not that costly as you think, especially with implicitly shared container (QString in your case).
it's much less overhead than any new or delete operation, for example. As soon as you perform a string, vector or list operation that behind the scene requires new or delete, the signals and slots overhead is only responsible for a very small proportion of the complete function call costs
Also, if you can get a pointer to 4th interface from your 1st, you can make a connection without signal forwarding.
@dream_captain You mean if we have 10 interfaces inorder to send a value from 1st interface to the 10th interface we have to create signal slot pairs in each interface? :O
No, in this case use