Function ontio_std::contract::ong::transfer_from

pub fn transfer_from(
    sender: &Address, 
    from: &Address, 
    to: &Address, 
    amount: U128
) -> bool

Spender transfers a certain amount of ong from from-address to to-address

Example

    let input = input();
    let mut source = Source::new(&input);
    let (spender, from, to, amount) = source.read().unwrap();
    ong::transfer_from(spender, from, to, amount);