Question

I have the following class structure:

class A {
  template<typename T> static void f(const T& input) {
     //do something with X and input
  }
  static ostringstream x;
}

Then in main I do:

...
int n = 5;
A::f(n);
...

This compiles fine, but I get a linkage error that A::x is a symbol that cannot be found. Has anyone encountered this error?

Thanks!

Answer 1

yes, you’ve yet to define x:

// A.cpp
std::ostringstream A::x;