Macro glib_boxed_wrapper

macro_rules! glib_boxed_wrapper {
    ([$($attr:meta)*] $visibility:vis $name:ident $(<$($generic:ident $(: $bound:tt $(+ $bound2:tt)*)?),+>)?, $ffi_name:ty,
     @copy $copy_arg:ident $copy_expr:expr, @free $free_arg:ident $free_expr:expr
     $(, @type_ $get_type_expr:expr)?) => { ... };
    (@generic_impl [$($attr:meta)*] $visibility:vis $name:ident $(<$($generic:ident $(: $bound:tt $(+ $bound2:tt)*)?),+>)?, $ffi_name:ty) => { ... };
    (@value_impl $name:ident $(<$($generic:ident $(: $bound:tt $(+ $bound2:tt)*)?),+>)?, $ffi_name:ty) => { ... };
    (@value_impl $name:ident $(<$($generic:ident $(: $bound:tt $(+ $bound2:tt)*)?),+>)?, $ffi_name:ty, @type_ $get_type_expr:expr) => { ... };
    (@memory_manager_impl $name:ident $(<$($generic:ident $(: $bound:tt $(+ $bound2:tt)*)?),+>)?, $ffi_name:ty, @copy $copy_arg:ident $copy_expr:expr, @free $free_arg:ident $free_expr:expr) => { ... };
}

Wrapper implementations for Boxed types. See wrapper!.