Re: help on how to wrap a C macros when binding linux/spi/spidev.h

[Nicholas Wilson via Digitalmars-d-learn]

On Thursday, 29 March 2018 at 08:47:50 UTC, dangbinghoo wrote:

 * #define SPI_MSGSIZE(N) \

((((N)*(sizeof (struct spi_ioc_transfer))) < (1 << _IOC_SIZEBITS)) \

                ? ((N)*(sizeof (struct spi_ioc_transfer))) : 0)
 */
extern (D) size_t SPI_MSGSIZE(size_t N)
{

return ((N * (spi_ioc_transfer.sizeof)) < (1 << _IOC_SIZEBITS)) ? (N * (spi_ioc_transfer.sizeof)) : 0;

}

/* #define SPI_IOC_MESSAGE(N) _IOW(SPI_IOC_MAGIC, 0, char[SPI_MSGSIZE(N)]) */

extern (D) auto SPI_IOC_MESSAGE(size_t N)
{
    size_t n = SPI_MSGSIZE(N);
    return _IOW!(char[static n])(SPI_IOC_MAGIC, 0);
    //mixin("return _IOW!(char[n])(SPI_IOC_MAGIC, 0);");
}
```

try

extern (D) auto SPI_IOC_MESSAGE(size_t N)()
{
    enum n = SPI_MSGSIZE(N);
    return _IOW!(char[n])(SPI_IOC_MAGIC, 0);
    //mixin("return _IOW!(char[n])(SPI_IOC_MAGIC, 0);");
}