Question

I’m having the next kind of error when linking the application:

undefined reference to 'MyStructure::K_VARIABLE_A
undefined reference to 'MyStructure::K_VARIABLE_B
...

The structure is defined inside “MyStructure.h” as:

struct MyStructure
{
const static int K_VARIABLE_A=1;
const static int K_VARIABLE_B=2;
...
}

How can i get rid of this error?

My source code compiles successfully for Windows platform but I get the error mentioned above when compiling for the android platform.

The header of this structure is properly included in the .cpp file.

Thanks in advance.

Answer 1

The preferred way to define constant values in the scope of a class/struct is this:

struct MyStructure
{
    enum
    {
        K_VARIABLE_A=1,
        K_VARIABLE_B=2,   // Note that you CAN keep the trailing comma
        ...
    };
};