Struct Signature

pub struct Signature {
    pub parameters: Vec<Box<dyn DataType>>,
    pub return_type: Box<dyn DataType>,
}

Signature struct is a representation of function type

Function type in GitQL used to track parameters and return type for now but later can track parameter names to allow pass parameter by name and improve error messages

GitQL Function Signature has some rules to follow

Rules:

• Parameters must contains 0 or 1 [VarargsType] parameter type only.
• [VarargsType] must be the last parameter.
• You can add 0 or more [DataType::Optional] parameters.
• [OptionalType] parameters must be at the end but also before [VarargsType] if exists.

The return type can be a static DataType such as Int, Float or Dynamic so you can return a dynamic type depending on parameters.

Fields

parameters: Vec<Box<dyn DataType>>

return_type: Box<dyn DataType>

Implementations

impl Signature

pub fn new( parameters: Vec<Box<dyn DataType>>, return_type: Box<dyn DataType>, ) -> Self

Create Instance of Signature with parameters and return type

pub fn with_return(return_type: Box<dyn DataType>) -> Self

Create Instance of Signature with return type and zero parameters

pub fn add_parameters(self, parameters: Vec<Box<dyn DataType>>) -> Self

Add list of parameters to the Signature

pub fn add_parameter(self, parameter: Box<dyn DataType>) -> Self

Add parameter to the Signature

Trait Implementations

impl Clone for Signature

fn clone(&self) -> Signature

Returns a duplicate of the value.

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

Performs copy-assignment from source.