Attribute Macro frame_support_procedural::transactional

#[transactional]

Execute the annotated function in a new storage transaction.

The return type of the annotated function must be Result. All changes to storage performed by the annotated function are discarded if it returns Err, or committed if Ok.

Example

#[transactional]
fn value_commits(v: u32) -> result::Result<u32, &'static str> {
	Value::set(v);
	Ok(v)
}

#[transactional]
fn value_rollbacks(v: u32) -> result::Result<u32, &'static str> {
	Value::set(v);
	Err("nah")
}