Problem with generic function

[jlbfunes]

Hello,

I am new to c++. I tried to create a function for doing the following:

1. Read a matrix from a .txt file
2. Store the retrieved data as a vector of vectors
3. Put the result in screen.

I could somehow complete parts 1 and 2. However, I am having lots of problems with the third part. I tried to use a generic function, and I am getting this complaint from my compiler:

d:\dogma\data\research\codes\zcppzone\test01\sscr. h|9|error C2065: 'T' : undeclared identifier

T there, is the type of the generic function. It is supposed to be ambiguous.
That is the problem. Any idea is appreciated. I am learnign this by myself so any kind of modification is welcome.

My codes:

Main function:

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include "sscr.h"

using namespace std;

int main(){

// Variable declaration and initialization

string x;
typedef string::size_type string_size;
string_size i = 0, j, sz;

vector <vector<int> > adjm;
vector<int> data;

ifstream adj("adj.txt");
istringstream sxp;

int hi;


// Actions

getline(adj, x);
sxp.str(x);
sz = x.size() - 1;

while (i != sz){

for (j = 0; j != sz; ++j){
sxp >> hi;
data.push_back(hi);
}
adjm.push_back(data);
sxp.clear();
data.clear();

getline(adj, x);
sxp.str(x);

++i;

}

// Closing commands
cout << "the number of items in a row of the file is: " << sz << endl;

int p = sscr(adjm);

return p;

}


Generic function:

#include <iostream>
#include <vector>
#include "sscr.h"

using std::vector; using std::iostream;

template <class T>
int sscr(vector<T> v){

for (vector<T>::const_iterator iter = v.begin(); iter != v.end(); ++iter){

for (vector<T>::const_iterator jter = (*iter).begin(); jter != (*iter).end(); ++jter){
if (jter != (*iter).end() - 1)
cout << *jter << " ";
else
cout << *jter << endl;
}
}
return 0;
}

Generic function header:

#ifndef SSCR_H_INCLUDED
#define SSCR_H_INCLUDED

#include <iostream>
#include <vector>

using std::vector; using std::iostream;

int sscr(std::vector<T>);

#endif // SSCR_H_INCLUDED

Thanks in advance.

[Banfa]

I am guessing that the code for your generic function sscr is in a CPP source file and that you are trying to compile it.

That is not how you use template functions (or classes). You should put the code into the header and just include the header into the source file you are calling the function from.

This is because a template function is not a definition of a function (that would normally go in a source file) but rather the declaration of the pattern for the function. The complier needs to see that pattern where it being called from and then from the pattern and the call it can work out the definition of the function that it automatically adds to the program for you.