Struct C4ExtraInfo 

#[repr(C)]
pub struct C4ExtraInfo {
    pub pointer: *mut c_void,
    pub destructor: Option<unsafe extern "C" fn(ptr: *mut c_void)>,
}

Client-defined metadata that can be associated with some objects like C4Database. (See \ref c4db_setExtraInfo, \ref c4db_getExtraInfo.) For example, if you have your own “Database” class, you could store a pointer to it in the ExtraInfo of the corresponding C4Database so you can map from it back to your object.

The destructor callback is optional, but gives you a chance to clean up (e.g. release) your own object when the containing C4 object is freed.

Fields

pointer: *mut c_void

destructor: Option<unsafe extern "C" fn(ptr: *mut c_void)>

Client-specific pointer; can be anything

Trait Implementations

impl Clone for C4ExtraInfo

fn clone(&self) -> C4ExtraInfo

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for C4ExtraInfo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for C4ExtraInfo