Defining the Vectors for strings as global

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Hi,
I am defining a container in a x.cpp file as

vector<string> somevariable;

I am trying to use it in another y.cpp file. I declare the vector as extern in y.cpp file like

extern vector<string> somevariable;

But when I compile the program I get the errors like:
1) somevariable : identifier not found; even with argument dependent lookup
2) error C2143: syntax error : missing ';' before '<'

I have included <string>, <vector> in my files and also using namespace std;

what am I missing?

Posted 20-Dec-09 23:50pm

RoopeshBhole

Updated 21-Dec-09 0:51am

CPallini

v3

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2 solutions

Solution 2

I think you need to declare it extern and initialise it in x.cpp. See the MSDN reference[^] for further information.

I stand corrected; Signor Pallini has the answer.

Posted 21-Dec-09 0:50am

Richard MacCutchan

Updated 21-Dec-09 0:54am

v2

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CPallini · Accepted Answer · 2009-12-21T00:49:00

Did you include x.cpp file in your project?
Did you include the required headers in both y.cpp and x.cpp source files?
The following test:
file b.cpp

#include <vector>
#include <string>

using namespace std;

vector <string> v;

file main.cpp

#include <vector>
#include <string>
#include <iostream>

using namespace std;

extern vector<string> v;
int main()
{
  v.push_back(string("hi"));
  cout << v[0] << endl;
}

compiles (and runs) fine.
:)