Struct Function 

pub struct Function {
    pub name: &'static str,
    pub arg_types: &'static [ValueType],
    pub variadic: Variadic,
    pub return_type: ValueType,
    pub experimental: bool,
}

Function signature definition.

Describes the name, argument types, return type, and variadic behavior of a built-in PromQL function.

Fields

name: &'static str

Function name.

arg_types: &'static [ValueType]

Argument types (in order).

variadic: Variadic

Variadic specification.

return_type: ValueType

Return type.

experimental: bool

Whether this is an experimental function.

Implementations

impl Function

pub fn min_args(&self) -> usize

Get the minimum number of arguments.

• For Variadic::Repeat: arg_types.len() - 1
• For Variadic::Optional(n): arg_types.len() - n
• For Variadic::None: arg_types.len()

pub fn max_args(&self) -> Option<usize>

Get the maximum number of arguments.

Returns None for variadic functions that accept unlimited arguments.

Trait Implementations

impl Clone for Function

fn clone(&self) -> Function

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Function

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

Formats the value using the given formatter.