Struct MethodDesc 

#[repr(C)]
pub struct MethodDesc {
    pub name: FfiStr,
    pub arities: *const u8,
    pub arities_len: usize,
    pub fun: Option<extern "C" fn(host: *const HostApi, receiver: GenericValue, args: *const GenericValue, nargs: usize) -> FfiReturn>,
}

Description of one method of a plugin-defined class.

Fields

name: FfiStr

Method name as seen from generic code (e.g. "__init__", "value").

arities: *const u8

Accepted argument counts, excluding the receiver (the host checks arity before calling). A method called as obj.foo(a, b) declares &[2]; a receiver-only method declares &[0].

arities_len: usize

Number of entries in arities.

fun: Option<extern "C" fn(host: *const HostApi, receiver: GenericValue, args: *const GenericValue, nargs: usize) -> FfiReturn>

The method implementation; a null pointer is rejected at load. This is PluginMethodFn spelled out inline - cbindgen only renders a nullable C function pointer for an inline Option<fn>, not through the alias.