Struct wca::Context

pub struct Context { /* private fields */ }

Container for contexts values

Examples:

use wca::Context;

let ctx = Context::default();

ctx.insert( 42 );
assert_eq!( 42, *ctx.get_ref().unwrap() );

let routine = Routine::new_with_ctx
(
  | ( args, props ), ctx |
  {
    let first_arg : i32 = args.get_owned( 0 ).unwrap_or_default();
    let ctx_value : &mut i32 = ctx.get_or_default();

    *ctx_value += first_arg;

    Ok( () )
  }
);
let ctx = Context::default();
if let Routine::WithContext( callback ) = routine
{
  callback( ( Args( vec![ Value::Number( 1.0 ) ] ), Props( Default::default() ) ), ctx.clone() ).unwrap();
}
assert_eq!( 1, *ctx.get_ref().unwrap() );

Implementations

impl Context

pub fn former() -> ContextFormer<Context, ReturnContainer>

Make former, variation of builder pattern to form structure defining values of fields step by step.

impl Context

pub fn insert<T: CloneAny>(&self, value: T)

Insert the T value to the context. If it is already exists - replace it

pub fn remove<T: CloneAny>(&mut self) -> Option<T>

Removes the T value from the context

pub fn get_ref<T: CloneAny>(&self) -> Option<&T>

Return immutable reference on interior object. ! Unsafe !

pub fn get_mut<T: CloneAny>(&self) -> Option<&mut T>

Return mutable reference on interior object. ! Unsafe !

pub fn get_or_insert<T: CloneAny>(&self, value: T) -> &mut T

Insert the value if it doesn’t exists, or take an existing value and return mutable reference to it

pub fn get_or_default<T: CloneAny + Default>(&self) -> &mut T

Insert default value if it doesn’t exists, or take an existing value and return mutable reference to it

Trait Implementations

impl Clone for Context

fn clone(&self) -> Context

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Context

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Context

fn default() -> Self

Returns the “default value” for a type.