Struct ColumnsFn 

pub struct ColumnsFn;

Trait Implementations

impl Debug for ColumnsFn

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

Formats the value using the given formatter.

impl Function for ColumnsFn

Returns the number of columns in a reference or array.

COLUMNS reports width, not data density.

Remarks

• For a single cell reference, returns 1.
• For full-row references (for example 1:1), returns 16384.
• For array literals, returns the first row width.
• Invalid references return an error.

Examples

title: "Count columns in a rectangular range"
formula: '=COLUMNS(B2:D10)'
expected: 3

title: "Count columns in a full row reference"
formula: '=COLUMNS(1:1)'
expected: 16384

related:
  - COLUMN
  - ROWS
  - CHOOSECOLS
faq:
  - q: "Does COLUMNS count non-empty cells?"
    a: "No. COLUMNS returns the width of the referenced array/range, including blank cells."
  - q: "What does COLUMNS return for a full-row reference like 1:1?"
    a: "It returns the sheet column limit, 16384."

[formualizer-docgen:schema:start] Name: COLUMNS Type: ColumnsFn Min args: 1 Max args: 1 Variadic: false Signature: COLUMNS(arg1: any@range) Arg schema: arg1{kinds=any,required=true,shape=range,by_ref=false,coercion=None,max=None,repeating=None,default=false} Caps: PURE [formualizer-docgen:schema:end]

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

fn min_args(&self) -> usize

fn caps(&self) -> FnCaps

Capability flags for this function

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 variadic(&self) -> bool

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.