Function ecs_cpp_component_register_explicit 

pub unsafe extern "C" fn ecs_cpp_component_register_explicit(
    world: *mut ecs_world_t,
    s_id: ecs_entity_t,
    id: ecs_entity_t,
    name: *const c_char,
    type_name: *const c_char,
    symbol: *const c_char,
    size: usize,
    alignment: usize,
    is_component: bool,
    existing_out: *mut bool,
) -> ecs_entity_t