Struct HelperScope 

pub struct HelperScope<'a, 'b> {
    pub program: &'a Program,
    pub invoke: RefCell<&'a mut InvokeScope>,
    /* private fields */
}

Context passed to helpers while a program is executing.

Fields

program: &'a Program

The program being executed.

invoke: RefCell<&'a mut InvokeScope>

Mutable per-invocation data for helpers.

Implementations

impl<'a, 'b> HelperScope<'a, 'b>

pub fn post_task( &self, task: impl Future<Output = impl FnOnce(&HelperScope<'_, '_>) -> Result<u64, ()> + 'static> + 'static, )

Posts an async task to be run between timeslices.

pub fn with_resource_mut<'c, T: 'static, R>( &'c self, callback: impl FnOnce(Result<&mut T, ()>) -> R, ) -> R

Calls callback with a mutable resource of type T, if present.

pub fn user_memory(&self, ptr: u64, size: u64) -> Result<&[u8], ()>

Validates and returns an immutable view into user memory.

pub fn user_memory_mut<'c>( &'c self, ptr: u64, size: u64, ) -> Result<MutableUserMemory<'a, 'b, 'c>, ()>

Validates and returns a mutable view into user memory.