Syntax errors in template method that I don't understand

Question

I wrote a short template method for a school project, and am getting weird syntax errors that I don't understand. They have something to do with the template I declared (when commenting out the header containing the template, all errors in main() go away) but I can't figure out what is going on. I'm including and "intersectHeader.h" and using the std namespace. In my main() function, all I'm doing is declaring a vector:

vector v1; -- errors: C2065 'string' undeclared identifier, C2065 'v1' undeclared identifier, C2065 'vector' undeclared identifier

This is the template:

template<typename T> vector<T> intersect(const vector<T> & v1, const vector<T> & v2) { vector<T> resultVector; bool duplicate = false; for (int i = 0; i < v1.size(); i++) { duplicate = false; for (int j = 0; j < v2.size(); j++) { if (v1[i] == v2[j]) { for (int a = 0; a < resultVector.size(); a++) { if (v1[i] == resultVector[a]) { duplicate = true; break; } } if (!duplicate) { resultVector.push_back(v1[i]); } } } } return resultVector; }

The above gives me these errors:

C2988 unrecognizable template declaration/definition, C2143 syntax error missing ';' before '<', C2059 syntax error '<'.

All of which occur in the second line "vector intersect(const vector & v1, const vector & v2)"

I don't know why the <> aren't showing up in the code, but the declaration is: template<typename T> vector<T> intersect(const vector<T> & v1, const vector<T> & v2) and the variable vector<T> resultVector; — Rick
– Rick, Commented Apr 28, 2016 at 6:19
Please copy-paste the complete error output into the body of the question, use code-formatting so all characters will be shown. Also please point out (with e.g. comments) where in the code the errors are. And if possible please try to create a Minimal, Complete, and Verifiable Example that you can show us. — Some programmer dude
– Some programmer dude, Commented Apr 28, 2016 at 6:22
At least show all the includes and "using namespace" things you have. Or better, remove all the using directives and prefix the relevant names with the appropriate qualifier. — Mat
– Mat, Commented Apr 28, 2016 at 6:25
Not much to go on here, but have you done #include <vector> before your template method? — Max Value
– Max Value, Commented Apr 28, 2016 at 6:37

John Zwinck · Accepted Answer · 2016-04-28 06:32:37Z

You should not do using namespace std in any header files. You should add the explicitly std:: namespace to your template implementation, and the problem should go away (assuming you have included the appropriate standard library headers).

@Rick: You're welcome. Please consider "accepting" this answer by clicking the checkmark on the left. Welcome to SO.

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