Call function outside of current namespace in C++

debugcn Published at Dev

span

I'm trying to call a function defined in a C file from my CPP code and I think I am having issues getting the correct namespace. When compiling I get the error: "Undefined reference to 'Get'".

My C header:

// c.h
#ifndef C_H
#define C_H

#ifdef __cplusplus
    extern "C" {
#endif

typedef enum
{
    VAL_A1,
    VAL_A2
} TYPE_A;

typedef enum
{
    VAL_B1,
    VAL_B2
} TYPE_B;

typedef enum
{
    VAL_C1,
    VAL_C2
} TYPE_C;

typedef struct
{
    TYPE_B b;
    TYPE_C c;
} TYPE_D;

TYPE_A Get(TYPE_B b, TYPE_D *d);

#ifdef __cplusplus
    }
#endif

#endif

And my CPP file:

// main.cpp
...

extern "C" {
    #include "c.h"
}

...

namespace MyNamespace
{
    ...

    MyClass::MyFunc()
    {
        TYPE_D d;
        // None of these calls will compile
        // Get(VAL_B1, &d);
        // ::Get(VAL_B1, &d);
    }

    ...
}

I have tried calling without namespace reference and also with the "root" namespace using "::" with no luck. Any help is appreciated. I've read through this which seems to clarify it but I don't really understand it:

using C++ with namespace in C

Mike Seymour

"Undefined reference" means that the function has been declared (in the header), but not defined. You'll need to define the function in a source file somewhere (presumably the C file you refer to), and make sure that is linked when you build the program.

Collected from the Internet

Please contact [email protected] to delete if infringement.

edited at2021-06-28

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