Trait artichoke_core::constant::DefineConstant

pub trait DefineConstant {
    type Value: Value;
    type Error;
    fn define_global_constant(
        &mut self, 
        constant: &str, 
        value: Self::Value
    ) -> Result<(), Self::Error>;
    fn define_class_constant<T>(
        &mut self, 
        constant: &str, 
        value: Self::Value
    ) -> Result<(), Self::Error>
    where
        T: 'static;
    fn define_module_constant<T>(
        &mut self, 
        constant: &str, 
        value: Self::Value
    ) -> Result<(), Self::Error>
    where
        T: 'static;
}

Deifne constants on an interprter.

Constants can be an arbitrary Ruby value. Constants can be defined globally, on a class, or on a module.

Associated Types

type Value: Value

Concrete type for Ruby values.

type Error

Concrete error type for fallible operations.

Required methods

fn define_global_constant(
    &mut self,
    constant: &str,
    value: Self::Value
) -> Result<(), Self::Error>

Define a global constant.

Errors

If the given constant name is not valid, an error is returned.

If the interpreter cannot define the constant, an error is returned.

fn define_class_constant<T>(
    &mut self,
    constant: &str,
    value: Self::Value
) -> Result<(), Self::Error> where
    T: 'static, 

Define a class constant.

The class is specified by the type parameter T.

Errors

If the class named by type T is not defined, an error is returned.

If the given constant name is not valid, an error is returned.

If the interpreter cannot define the constant, an error is returned.

fn define_module_constant<T>(
    &mut self,
    constant: &str,
    value: Self::Value
) -> Result<(), Self::Error> where
    T: 'static, 

Define a module constant.

The class is specified by the type parameter T.

Errors

If the module named by type T is not defined, an error is returned.

If the given constant name is not valid, an error is returned.

If the interpreter cannot define the constant, an error is returned.

Implementors