Question

I have a solution consisting of two projects:

Project1
containing a single file program.cpp

namespace Program1 {
  void foo() { ... }
}

Project2
containing another single file program.cpp in which I’d like to call foo()

namespace Program2 {
  void bar() { Program1::foo() }
}

I have set:

• project dependencies (Program2 depends on Program1)
• references in Program2 to Program1

But still I recieve an error

error C2653: 'Program1' : is not a class or namespace name

What else do I need to do to call Program1::foo() in Project2?

Answer 1

You need to include the header file which contains the declaration:

Project1 – Program.h

namespace Program1 {
  void foo();
}

Project2 – Program.cpp

#include "Program.h"
namespace Program2 {
  void bar() { Program1::foo() }
}