rkb rkb - 5 months ago 25
C++ Question

What is external linkage and internal linkage in C++

I want to understand the external linkage and internal linkage and their difference.

I also want to know the meaning of

variables internally link by default unless otherwise declared as


When you write an implementation file (.cpp, .cxx, etc) your compiler generates a translation unit. This is the object file from your implementation file plus all the headers you #included in it.

Internal linkage refers to everything only in scope of a translation unit.

External linkage refers to things that exist beyond a particular translation unit. In other words, accessible through the whole program, which is the combination of all translation units (or object files).