Template class - unresolved external symbol(s) [duplicate]

Answer 1

This errors are happening because, your template definitions are not visible to the user code. Template definition should be declared in,

1. Header file, along with the template declarations
2. In the .cpp file, where the user code uses it. However in this approach the definition will be visible only to the .cpp which uses it. See below example

test.h

template
void foo (T*);

test.cpp

int main ()
{
  foo(1);
}

template
void foo (T *p)
{
 ...
}

test2.cpp

// This file can not see the definition of foo