Why does mapping require a function?

[FallingSnow]

Why does mapping require a function to be passed instead of mapping then unmapping on drop?

gbm.rs/src/buffer_object.rs

Lines 299 to 310 in 8fd2021

	pub fn map<'a, D, F, S>(
	&'a self,
	device: &Device<D>,
	x: u32,
	y: u32,
	width: u32,
	height: u32,
	f: F,
	) -> Result<IoResult<S>, WrongDeviceError>
	where
	D: AsFd + 'static,
	F: FnOnce(&MappedBufferObject<'a, T>) -> S,

[Drakulix]

This could alternatively be handled by a guard-type, feel free to submit a PR. Key is just, that we block freeing the buffer before the mapping and avoid calling other methods such as write.