Trait evalexpr::ContextMut

pub trait ContextMut: Context {
    fn set_value<S: Into<String>, V: Into<Value>>(
        &mut self, 
        identifier: S, 
        value: V
    ) -> EvalexprResult<()>;
    fn set_function<S: Into<String>>(
        &mut self, 
        identifier: S, 
        function: Function
    ) -> EvalexprResult<()>;
}

A mutable context for an expression tree.

In addition to all functionality of a Context, a mutable context also allows the manipulation of values and functions. This crate implements two basic variants, the EmptyContext, that returns an error for each manipulation, and the HashMapContext, that stores its mappings in hash maps. The HashMapContext is type-safe and returns an error if the user tries to assign a value of a different type than before to an identifier.

Required methods

fn set_value<S: Into<String>, V: Into<Value>>(
    &mut self,
    identifier: S,
    value: V
) -> EvalexprResult<()>

Links the given value to the given identifier.

fn set_function<S: Into<String>>(
    &mut self,
    identifier: S,
    function: Function
) -> EvalexprResult<()>

Links the given function to the given identifier.

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Implementors

impl ContextMut for EmptyContext

fn set_value<S: Into<String>, V: Into<Value>>(
    &mut self,
    _identifier: S,
    _value: V
) -> EvalexprResult<()>

fn set_function<S: Into<String>>(
    &mut self,
    _identifier: S,
    _function: Function
) -> EvalexprResult<()>

impl ContextMut for HashMapContext

fn set_value<S: Into<String>, V: Into<Value>>(
    &mut self,
    identifier: S,
    value: V
) -> EvalexprResult<()>

fn set_function<S: Into<String>>(
    &mut self,
    identifier: S,
    function: Function
) -> EvalexprResult<()>

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