A shift method allows a read, write, and shift operation to be performed.
// Include the Class
#include "ap_shift_reg.h"
// Define a variable of type ap_shift_reg<type, depth>
// - Sreg must use the static qualifier
// - Sreg will hold integer data types
// - Sreg will hold 4 data values
static ap_shift_reg<int, 4> Sreg;
int var1;
// Read location 3 of Sreg into var1
// THEN shift all values up one and load In1 into location 0
var1 = Sreg.shift(In1,3);