Namespace error

Question

Namespace error

Prayas Bharadwaj 1

I am beginner to C++

I have been writing a simple library defined in my own namespace core but when I using namespace core; , Visual Studio throws errors

These are my files

This is the code

These are the errors

Jeanine Zhang-MSFT 11,356 Reputation points Microsoft External Staff

2020-10-21T06:33:46.79+00:00

@Prayas Bharadwaj ,

The Compiler Error C2039 may occur when namespace members are declared across multiple header files, and you have not included those headers in the correct order.

I'm appreciate that if you could provide us a sample to reproduce the issue, we will provide you with better help.

Best Regards,

Jeanine

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Jeanine Zhang-MSFT 11,356 Reputation points Microsoft External Staff

2020-10-21T06:33:46.79+00:00

@Prayas Bharadwaj ,

The Compiler Error C2039 may occur when namespace members are declared across multiple header files, and you have not included those headers in the correct order.

I'm appreciate that if you could provide us a sample to reproduce the issue, we will provide you with better help.

Best Regards,

Jeanine

Answer 1

Guido Franzke 2,191

Hello,
you must include the header file of your namespace core. using core is not enough. In addition you use the scope operator :: , so you don't need the using core line.
If your namespace is declared in your file "Namespace.h", then you must include this file:

#include "Namespace.h"
//using namespace core;
int main() { ...

Read this:
c_header_files.htm
how-to-use-include-directive-correctly

Regards, Guido

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