3 tips for extern "C"

1. extern "C" is a keyword in C ++, which is not in C. That is to say, for a pure C compiler, it does not know extern "C" at all, which will lead to compilation errors.

 

2. extern "C" is used to make C ++ compiled functions and variable names consistent with those after C language compilation, that is, the C and C ++ compatible functions and variables are modified by C within the scope of their inclusion.

 

3. extern "C" only affects general functions and variables. It does not affect the names of C ++-specific classes and class-related member functions. The object name is affected because no matter what type of object is a common variable.