I have a template class with a read() method. It needs to call a C functions: read1(), read2(), read3() etc based upon the template parameter value. Is there is a cleaner way to do this than a switch on the template value? I have tried using a MACRO:

#define READ(N) read##N##()

But this doesn’t work as X is simply replaced by the C Preprocessor as ‘N’ resulting in “readN()”

int read1()
{
}

int read2()
{
}

int read3()
{
}

...

template <int N>
struct Reader
{
    int read()
    {
        switch (N)
        {
        case 1:
            return read1();
        case 2:
            return read2();
        case 3:
            return read3();
        }
    }

    /* Doesn't work as X is simply replaced by the C Preprocessor as 'N' resulting in "readN()"
    #define READ(X) read##X##()
    int read()
    {
        return READ(N);
    }
    */
};