C/CPP files should include their own header files first and you should enable those warnings you said. But that is not enough: the compiler doesn’t check the names of the parameters, ...

What reasons are there for using separate implementation and header files in C++, as opposed to a single header file as in Java?Lately I've been including the implementation in the header file ...

I always have one .cpp file (for function definitions) and one .h file ... (especially a template) in a lot of places, it might be wise to put it in a separate header file and include that.