Struct Context 

pub struct Context {
    pub globals: BTreeMap<String, Box<dyn Any>>,
}

Virtual machine context

Fields

globals: BTreeMap<String, Box<dyn Any>>

The global variables queryable by name

Implementations

impl Context

pub fn new() -> Self

Create an empty context

pub fn set_global<K: ToString, V: Any>(&mut self, key: K, value: V)

Set a global variable

pub fn replace_global<K: ToString, V: Any, R: Any>( &mut self, key: K, value: V, ) -> Result<Option<Box<R>>, Trap>

This does the same thing as set_global but attempts to return the variable which was replaced

pub fn get_global<K: AsRef<str>, V: Any>( &self, key: K, ) -> Result<Option<&V>, Trap>

Get a global variable

pub fn get_global_mut<K: AsRef<str>, V: Any>( &mut self, key: K, ) -> Result<Option<&mut V>, Trap>

Get a mutable reference to a global variable

pub fn delete_global<K: AsRef<str>>(&mut self, key: K)

Delete a global variable

pub fn remove_global<K: AsRef<str>, R: Any>( &mut self, key: K, ) -> Result<Option<Box<R>>, Trap>

Does the same thing as delete_global but attempts to return the removed variable

Trait Implementations

impl Default for Context

fn default() -> Context

Returns the “default value” for a type.