Can I default a function argument to the value of

问题:

In C++, can I have a defaulted argument to a function which defaults to __PRETTY_FUNCTION___, ___FILE___, and ___LINE__ as defined at the point of the caller and not the point the defaults are supplied in a header file without using macros?

回答1:

You can't, but you can acheive this behavior with an additional macro. For instance:

#DEFINE THROW(e) throwException(e, __FILE__, __LINE__);

On a side note, __PRETTY_FUNCTION__ is not standard.

回答2:

No. Macros are expanded at the source line where they occur.

回答3:

You probably can... but definitely not with the restriction you mentioned (no macros).