What should go into an .h file? | 合法醫療器材資訊網

2009年12月22日—Headerfiles(.h)aredesignedtoprovidetheinformationthatwillbeneededinmultiplefiles.Thingslikeclassdeclarations,functionprototypes ...

Fact is, in C++, this is somewhat more complicated that the C header/source organization.

The compiler sees one big source (.cpp) file with its headers properly included. The source file is the compilation unit that will be compiled into an object file.

Because one compilation unit could need information about an implementation in another compilation unit. So one can write for example the implementation of a function in one source, and write the declaration of this function in another source needing to use it.

In this case, there are two copies of the same information. Which is evil...

The solution is to share some details. While the implementation should remain in the Source, the declaration of shared symbols, like functions, or definition of structures, classes, enums, etc., could need...