Reference a vector array in multiple cpp files

Asked Jul 26 '18 at 15:23

Active Jul 26 '18 at 15:34

Viewed 34 times

How do I reference a vector array in multiple cpp files and headers

The folowing gives the error: undefined reference to `function(std::vector >&)'|

main.cpp

functionD(arr);
cout << arr[3] << endl;

header.h

extern vector<string> arr;
int functionD(vector<string> arr);

functions.cpp

vector<string> arr;

int functionD(vector<string>& arr){

arr.push_back("0");
arr.push_back("1");
arr.push_back("2");
arr.push_back("3");
arr.push_back("4");
arr.push_back("5");
arr.push_back("6");
arr.push_back("7");

return 1;

}

edited Jul 26 '18 at 15:34

asked Jul 26 '18 at 15:23

1

Pass it as an argument to the relevant functions. – Cheers and hth. - Alf Jul 26 '18 at 15:25
1

Your example isn't clear. In functions.cpp, you are only using the argument `arr`, not the global `arr`? – Dutow Jul 26 '18 at 15:28
int function(vector *&* arr); in header.h – wtom Jul 26 '18 at 15:30
1

Why do you want to do this? Having a global variable can get confusing. Could you pass the `arr` from main into your functions? – doctorlove Jul 26 '18 at 15:30
Which line gives the error? – doctorlove Jul 26 '18 at 15:32
in main.cpp line: functionD(arr); – Jul 26 '18 at 15:35
You are confusing the readers and compiler when you use the same name for function parameters as global variables. I recommend renaming the parameter. – Thomas Matthews Jul 26 '18 at 16:15
You don't need to pass global variables. Access them directly. – Thomas Matthews Jul 26 '18 at 16:16

Reference a vector array in multiple cpp files

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