I have tried using a template in a class but it works in the main function.

Here is my main function:

#include <iostream>
#include <string>

using namespace std;

int main() {
    templEx();
}

And here is the class where the template is located:

#include <iostream>

#include <string>

using namespace std;

template<typename T>
void Print(T value)
{
    std::cout << value << std::endl;
}

void templEx() {
    Print("Venezuela");
}

And here are the errors which I get:

Severity Code Description Project File Line Source Suppression State
Error LNK2005 "void __cdecl templEx(void)" (?templEx@@YAXXZ) already defined in AddSubtract.obj ConsoleApplication1 C:\Users\bahge\source\repos\ConsoleApplication1\ConsoleApplication1\Source1.obj 1 Build

Severity Code Description Project File Line Source Suppression State
Error LNK1169 one or more multiply defined symbols found ConsoleApplication1 C:\Users\bahge\source\repos\ConsoleApplication1\x64\Debug\ConsoleApplication1.exe 1 Build

>Solution :

You’re compiling that code that defines tmplEx once in the main.cpp and additionally in the secondary source file, which leads to the conflict.

Define the template in a separate header file that both can #include as necessary.