error using mex with external library with extra qualifiers

Hello,

I am trying to compile a mex function with an external .cpp library which has extra qualifiers. How can I call the functions from external library that has extra qualifiers?

If I don't add the qualifier the error is:

C:\Users\rdeshpande\DS10ep_workspace\MatlabProspectra\mfiles\cprogram\CallMathLib.cpp:29:47: error: 'Add' was not declared in this scope

     plhs[0] =mxCreateDoubleScalar (Add(no1,no2));

If I add the extra qualifier in this call

 plhs[0] =mxCreateDoubleScalar (MathLibrary::Functions::Add(no1,no2));

The error is: Building with 'MinGW64 Compiler (C++)'. Error using mex C:\Users\RDESHP~1\AppData\Local\Temp\mex_245413811332369_15808\CallMathLib.obj:CallMathLib.cpp:(.text+0xab): undefined reference to `__imp__ZN11MathLibrary9Functions3AddEdd' collect2.exe: error: ld returned 1 exit status

[James Tursa]

What is the mex command you are using? How are you linking in the MathLibrary?

[Rucha Deshpande]

The mex command I am using is :

mex CallMathLib.cpp MathLibrary.lib

In MathLibrary.h:

namespace MathLibrary  
{  
    // This class is exported from the MathLibrary.dll  
    class Functions  
    {  
    public:  
        // Returns a + b  
        static MATHLIBRARY_API double Add(double a, double b);  

      };

}