#inside a function
Device::BCM2835::gpio_fsel ( Device::BCM2835::RPI_V2_GPIO_P1_12, Device::BCM2835::BCM2835_GPIO_FSEL_ALT5 );

##</code><code>##

package Device::BCM2835;
#some place later in a function
gpio_fsel(RPI_V2_GPIO_P1_12, BCM2835_GPIO_FSEL_ALT5);