Function rvs::rvs_prev

#[no_mangle]pub extern "C" fn rvs_prev(model: *mut Model, handle: u32) -> u32

Returns the previous value of a variable

Errors

• Returns 0 if handle is invalid
• Returns 0 if rvs_next has not been called

Panics

• If any pointer arguments are null
• If handle doesn't exist