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Initialization in C++ is bonkers (2017)
Personal blog and CV for Sy Brand
Since the constructor for foo is defaulted on its first declaration, it is not technically user-provided – I’ll explain what this term means shortly, just accept this standardese for now. This rule makes sense when you think about it: without having access to the definition of a constructor, a translation unit can’t know if it is going to be a simple compiler-generated one, or if it’s going to send a telegram to the Moon to retrieve some data and block until it gets a response. This is a very subtle distinction which has inadvertently changed our program from executing safely to summoning nasal demons/eating your cat/ordering pizza/your favourite undefined behaviour metaphor.
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