anchor-lang 1.0.1

Solana Sealevel eDSL
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

use crate::{
    prelude::{Id, System},
    solana_program::{account_info::AccountInfo, system_program},
    Result,
};

pub(crate) fn close<'info>(
    info: &AccountInfo<'info>,
    sol_destination: &AccountInfo<'info>,
) -> Result<()> {
    // Transfer tokens from the account to the sol_destination.
    let dest_starting_lamports = sol_destination.lamports();
    **sol_destination.lamports.borrow_mut() =
        dest_starting_lamports.checked_add(info.lamports()).unwrap();
    **info.lamports.borrow_mut() = 0;

    info.assign(&system_program::ID);
    info.resize(0).map_err(Into::into)
}

pub fn is_closed(info: &AccountInfo) -> bool {
    info.owner == &System::id() && info.data_is_empty()
}