Function reserve_gas 

pub fn reserve_gas(amount: u64, duration: u32) -> Result<ReservationId, Error>

Available on non-crate feature ethexe only.

Reserve the amount of gas for further usage.

duration is the block count within which the reserve must be used.

This function returns ReservationId, which one can use for gas unreserving.

Examples

Reserve 50 million of gas for seven blocks:

use gcore::{ReservationId, exec};

static mut RESERVED: ReservationId = ReservationId::zero();

#[unsafe(no_mangle)]
extern "C" fn init() {
    unsafe { RESERVED = exec::reserve_gas(50_000_000, 7).unwrap() };
}

#[unsafe(no_mangle)]
extern "C" fn handle() {
    exec::unreserve_gas(unsafe { RESERVED }).expect("Unable to unreserve");
}

See also

• unreserve_gas function unreserves gas identified by ReservationId.
• system_reserve_gas function reserves gas for system usage.