patch_seq_roll

seq_runtime::stack

Function patch_seq_roll 

Source 
#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_roll(
    stack: *mut StackValue,
) -> *mut StackValue
Expand description

Roll: Rotate n+1 items, bringing the item at depth n to the top ( x_n x_(n-1) … x_1 x_0 n – x_(n-1) … x_1 x_0 x_n )

§Safety

Stack must have at least n+1 values (plus the index value).

§Errors

Sets runtime error if:

  • The top value is not an Int
  • n is negative
  • n exceeds the current stack depth