Struct Context 

pub struct Context { /* private fields */ }

A Context object we will be handing to evaluators so they are aware of external registered Functions.

Implementations

impl Context

pub fn new() -> Self

Create a new instance w/ no registered functions and the globally configured implicit CRS.

pub fn try_with_crs(crs_code: &str) -> Result<Self, MyError>

Create a new instance w/ an implicit CRS specified by a given code. Use this method to override the global default CRS code configured by setting the environment variable DEFAULT_CRS.

pub fn register<F>( &mut self, name: &str, arg_types: Vec<ExtDataType>, result_type: ExtDataType, closure: F, )

where F: Fn(Vec<Box<dyn Any>>) -> Option<Box<dyn Any>> + Send + Sync + 'static,

Register a Function (Rust Closure) by name with expected argument(s) and result types.

pub fn freeze(self) -> SharedContext

Return a safe share-able read-only version of this frozen at the time of the call.

pub fn crs(&self) -> &CRS

Return a reference to the currently set CRS w/in this.

pub fn fn_info(&self, name: &str) -> Option<&FnInfo>

Return meta-information about a Function already registered in this.

pub fn register_builtins(&mut self)

Register all builtin functions we support.

Trait Implementations

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.