Inside the Qt Object Model
summary
A small calculator app demonstrates that Qt implements signals as generated functions so emit is a normal function call which packs parameter addresses into a void array and consults a generated static meta object to find the slot ID and dispatch it. Within one thread no copies occur and execution stays synchronous. When receiver lives on another thread Qt creates a QMetaCallEvent*, copies parameters appropriately, posts the event and the slot runs on the target thread.
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chapters (5)
- 0:00Introduction to Qt Object Model
- 1:04Signals and slots basics
- 6:08Signal emission call stack
- 17:04Signals slots across threads
- 26:19Q&A session
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