steel 4.0.9

Solana smart contract framework
Documentation 
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use solana_program::{account_info::AccountInfo, program_error::ProgramError};

pub trait LamportTransfer<'a, 'info> {
    fn send(&'a self, lamports: u64, to: &'a AccountInfo<'info>);
    fn collect(&'a self, lamports: u64, from: &'a AccountInfo<'info>) -> Result<(), ProgramError>;
}

impl<'a, 'info> LamportTransfer<'a, 'info> for AccountInfo<'info> {
    #[inline(always)]
    fn send(&'a self, lamports: u64, to: &'a AccountInfo<'info>) {
        **self.lamports.borrow_mut() -= lamports;
        **to.lamports.borrow_mut() += lamports;
    }

    #[inline(always)]
    fn collect(&'a self, lamports: u64, from: &'a AccountInfo<'info>) -> Result<(), ProgramError> {
        solana_program::program::invoke(
            &solana_program::system_instruction::transfer(from.key, self.key, lamports),
            &[from.clone(), self.clone()],
        )
    }
}