Struct RomanFn 

pub struct RomanFn;

Trait Implementations

impl Debug for RomanFn

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

Formats the value using the given formatter.

impl Function for RomanFn

Converts an Arabic number to a Roman numeral string.

Remarks

• Accepts integer values in the range 0..=3999.
• 0 returns an empty string.
• Optional form controls output compactness (0 classic through 4 simplified).
• Out-of-range values return #VALUE!.

Examples

title: "Classic Roman numeral"
formula: "=ROMAN(1999)"
expected: "MCMXCIX"

title: "Another conversion"
formula: "=ROMAN(44)"
expected: "XLIV"

related:
  - ARABIC
  - TEXT
faq:
  - q: "What input range does ROMAN support?"
    a: "ROMAN accepts truncated integers from 0 through 3999; outside that range it returns #VALUE!."

[formualizer-docgen:schema:start] Name: ROMAN Type: RomanFn Min args: 1 Max args: variadic Variadic: true Signature: ROMAN(arg1: number@scalar, arg2…: number@scalar) Arg schema: arg1{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false}; arg2{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false} Caps: PURE [formualizer-docgen:schema:end]

fn caps(&self) -> FnCaps

Capability flags for this function

fn name(&self) -> &'static str

fn min_args(&self) -> usize

fn variadic(&self) -> bool

fn arg_schema(&self) -> &'static [ArgSchema]

fn eval<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], _ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

The unified evaluation path.

fn namespace(&self) -> &'static str

fn volatile(&self) -> bool

fn aliases(&self) -> &'static [&'static str]

Optional list of additional alias names (case-insensitive) that should resolve to this function. Default: empty slice. Implementors can override to expose legacy names. Returned slice must have ’static lifetime (typically a static array reference).

fn function_salt(&self) -> u64

fn eval_reference<'a, 'b, 'c>( &self, _args: &'c [ArgumentHandle<'a, 'b>], _ctx: &dyn FunctionContext<'b>, ) -> Option<Result<ReferenceType, ExcelError>>

Optional reference result path. Only called by the interpreter/engine when the callsite expects a reference (e.g., range combinators, by-ref argument positions, or spill sources).

fn dispatch<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

Dispatch to the unified evaluation path with automatic argument validation.