Struct FFIOperatorVTable 

#[repr(C)]
pub struct FFIOperatorVTable {
    pub apply: extern "C" fn(*mut c_void, *mut FFIContext, *const FlowChangeFFI, *mut FlowChangeFFI) -> i32,
    pub get_rows: extern "C" fn(*mut c_void, *mut FFIContext, *const u64, usize, *mut RowsFFI) -> i32,
    pub destroy: extern "C" fn(*mut c_void),
}

Virtual function table for FFI operators

This unified interface provides all methods an operator might need. Operators that don’t use certain features (e.g., state) simply won’t call those methods. All function pointers must be valid (non-null).

Fields

apply: extern "C" fn(*mut c_void, *mut FFIContext, *const FlowChangeFFI, *mut FlowChangeFFI) -> i32

Apply the operator to a flow change

Parameters

• instance: The operator instance pointer
• ctx: FFI context for this operation
• input: Input flow change
• output: Output flow change (to be filled by operator)

Returns

• 0 on success, negative error code on failure

get_rows: extern "C" fn(*mut c_void, *mut FFIContext, *const u64, usize, *mut RowsFFI) -> i32

Get specific rows by their row numbers

Parameters

• instance: The operator instance pointer
• ctx: FFI context for this operation
• row_numbers: Array of row numbers to fetch
• count: Number of row numbers
• output: Output rows structure (to be filled)

Returns

• 0 on success, negative error code on failure

destroy: extern "C" fn(*mut c_void)

Destroy an operator instance and free its resources

Parameters

• instance: The operator instance pointer to destroy

Safety

• The instance pointer must have been created by this operator’s create function
• The instance must not be used after calling destroy
• This function must be called exactly once per instance

Trait Implementations

impl Clone for FFIOperatorVTable

fn clone(&self) -> FFIOperatorVTable

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for FFIOperatorVTable