Macro glib::glib_shared_wrapper

macro_rules! glib_shared_wrapper {
    ([$($attr:meta)*] $name:ident, $ffi_name:path, @ref $ref_arg:ident $ref_expr:expr,
     @unref $unref_arg:ident $unref_expr:expr,
     @get_type $get_type_expr:expr) => { ... };
    ([$($attr:meta)*] $name:ident, $ffi_name:path, @ref $ref_arg:ident $ref_expr:expr,
     @unref $unref_arg:ident $unref_expr:expr) => { ... };
}

Wrapper implementations for shared types. See glib_wrapper!.