Enum Arg 

#[non_exhaustive]
pub enum Arg<'a> {
    Str(&'a str),
    Int(i64),
    Float(f64),
    Decimal(&'a str),
    Custom(&'a dyn CustomValue),
    Unset,
    DateTime(&'a DateTime<'a>),
}

A positional argument: slot i of the call site is args[i] (the manifest’s slot order). Small on purpose: every variant is a code path in the wasm. Non-exhaustive, so variants can be added.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Str(&'a str)

A string.

Int(i64)

An integer.

Float(f64)

A float (finite values format; others are a Bad Operand).

Decimal(&'a str)

An exact decimal as number-literal text (-12.50, 1e3).

Custom(&'a dyn CustomValue)

An application value.

Unset

No value: Unresolved Variable.

DateTime(&'a DateTime<'a>)

A date/time (by reference, so Arg stays small).

Trait Implementations

impl<'a> Clone for Arg<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for Arg<'a>

impl Debug for Arg<'_>

As a derived Debug would show it, but an application value, which has no Debug of its own, is Custom(..).

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

Formats the value using the given formatter.

impl<'a> From<&'a DateTime<'a>> for Arg<'a>

fn from(d: &'a DateTime<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<&'a String> for Arg<'a>

fn from(s: &'a String) -> Self

Converts to this type from the input type.

impl<'a> From<&'a str> for Arg<'a>

fn from(s: &'a str) -> Self

Converts to this type from the input type.

impl From<f32> for Arg<'_>

fn from(x: f32) -> Self

Converts to this type from the input type.

impl From<f64> for Arg<'_>

fn from(x: f64) -> Self

Converts to this type from the input type.

impl From<i8> for Arg<'_>

fn from(n: i8) -> Self

Converts to this type from the input type.

impl From<i16> for Arg<'_>

fn from(n: i16) -> Self

Converts to this type from the input type.

impl From<i32> for Arg<'_>

fn from(n: i32) -> Self

Converts to this type from the input type.

impl From<i64> for Arg<'_>

fn from(n: i64) -> Self

Converts to this type from the input type.

impl From<u8> for Arg<'_>

fn from(n: u8) -> Self

Converts to this type from the input type.

impl From<u16> for Arg<'_>

fn from(n: u16) -> Self

Converts to this type from the input type.

impl From<u32> for Arg<'_>

fn from(n: u32) -> Self

Converts to this type from the input type.