duplicate symbol error C++

Question

I have added some const character in my file as under. The error i get is duplicate symbol _xyz(say). What is the problem with it and how could i get out of this.

Answer 1

The problem is every source file that includes your header file gets it's own copy of xyz with external linkage.

The easiest way to fix that is to give xyz internal linkage. You can do that by making the pointer itself const in addition to having the underlying char's const:

const char* const xyz = "xyz";