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#![cfg_attr(feature = "js", allow(unused))]
use wasmer::Memory;

use crate::WasiInstanceHandles;

pub(crate) type WasiInstanceGuard<'a> = &'a WasiInstanceHandles;
pub(crate) type WasiInstanceGuardMut<'a> = &'a mut WasiInstanceHandles;
pub(crate) type WasiInstanceGuardMemory<'a> = &'a Memory;

/// This pointer provides global access to some instance handles
#[derive(Debug, Clone, Default)]
pub(crate) struct WasiInstanceHandlesPointer {
    inner: Option<WasiInstanceHandles>,
}
impl WasiInstanceHandlesPointer {
    pub fn get(&self) -> Option<&WasiInstanceHandles> {
        self.inner.as_ref()
    }
    pub fn get_mut(&mut self) -> Option<&mut WasiInstanceHandles> {
        self.inner.as_mut()
    }
    pub fn set(&mut self, val: WasiInstanceHandles) {
        self.inner.replace(val);
    }
    #[allow(dead_code)]
    pub fn clear(&mut self) {
        self.inner.take();
    }
}