Shared Vector Variables Among Multiple C++ files

Question

I want to share(globalize) some vector variables(V1 and V2) between two cpp files(A.cpp and B.cpp). I have already defined both V1 and V2 in A.h by the following commands. ``` extern vector V1; extern vector V2; ``` I also have added #include "A.h" to both A.cpp and B.CPP files. Can anyone let me know what else should I do to be able to access the elements of V1 and V2 in both of these CPP files? Thanks in Advance

Accepted Answer

First, you need to pick up place where your vectors should be defined. Let's say that you choose `A.cpp`. In `A.cpp` (only in one file - defining same object in multiple files will yield multiple defined symbols error) define vectors as global variables: ``` vector V1; vector V2; ``` In `B.cpp` (and in all other files from which you want to access `V1` and `V2`) declare vectors as `extern`. This will tell linker to search elsewhere for the actual objects: ``` extern vector V1; extern vector V2; ``` Now, in the linking step `V1` and `V2` from `B.cpp` will be connected to the `V1` and `V2` from `A.cpp` (or whereever these objects are defined).

Shared Vector Variables Among Multiple C++ files

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