Shared Vector Variables Among Multiple C++ files -


i want share(globalize) vector variables(v1 , v2) between 2 cpp files(a.cpp , b.cpp). have defined both v1 , v2 in a.h following commands.

extern vector<uint64_t> v1; extern vector<uint64_t> v2;

i have added #include "a.h" both a.cpp , b.cpp files. can let me know else should able access elements of v1 , v2 in both of these cpp files?

thanks in advance

first, need pick place vectors should defined. let's choose a.cpp.

in a.cpp (only in 1 file - defining same object in multiple files yield multiple defined symbols error) define vectors global variables:

 vector<uint64_t> v1;  vector<uint64_t> v2;

in b.cpp (and in other files want access v1 , v2) declare vectors extern. tell linker search elsewhere actual objects:

 extern vector<uint64_t> v1;  extern vector<uint64_t> v2;

now, in linking step v1 , v2 b.cpp connected v1 , v2 a.cpp (or whereever these objects defined).


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