std::vector works with classes that are not default constructible?

Question

I\'ve read in several places that std::vector requires it\'s template argument to be default constructible. Today I just tried it with one of my classes that has a delete<

Answer 1

Well, templates are in some meaning weakly typed. That is, the missing default constructor won't be detected until your code calls the method where it's used, perhaps internally -- this will give a compile-time error.

However, unless you are not touching the methods which use the default constructor internally, you are "safe". However, I don't know which is the "safe" subset, and I suspect that it's not defined by the standard. Example: vector copying might use resize, which in turn might use default constructor.