Type Alias SDL_CompareCallback_r 

pub type SDL_CompareCallback_r = Option<unsafe extern "C" fn(userdata: *mut c_void, a: *const c_void, b: *const c_void) -> c_int>;

A callback used with SDL sorting and binary search functions.

Parameters

• userdata: the userdata pointer passed to the sort function.
• a: a pointer to the first element being compared.
• b: a pointer to the second element being compared.

Return value

Returns -1 if a should be sorted before b, 1 if b should be sorted before a, 0 if they are equal. If two elements are equal, their order in the sorted array is undefined.

Availability

This callback is available since SDL 3.2.0.

See also

• SDL_qsort_r
• SDL_bsearch_r

Aliased Type

pub enum SDL_CompareCallback_r {
    None,
    Some(unsafe extern "C" fn(*mut c_void, *const c_void, *const c_void) -> i32),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*mut c_void, *const c_void, *const c_void) -> i32)

Some value of type T.