Including header file in multiple sources in same project
Author
I should know this but am drawing a complete blank. I have several files within my project that need to have access to variables in a header file.
Including the header file in each of these files leads to linker errors regarding the symbols already being defined, what is the solution?
Thanks in advance
Define the variable in a single translation unit, and place an extern declaration of that variable in the header file.
At the top of your headers, you can write #pragma once, to block against multiple inclusion. This will stop redefintions from including it all over the place. To access the variables
in the h file
extern var_type varname;
Then you just have to define it properly in one of your source files. It can be used anywhere that includes the header.
in the h file
extern var_type varname;
Then you just have to define it properly in one of your source files. It can be used anywhere that includes the header.
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