Struct FnSpec 

pub struct FnSpec {
    pub name: &'static str,
    pub min_args: usize,
    pub max_args: usize,
    pub category: Category,
    pub volatile: bool,
    pub scalar_args: &'static [bool],
    pub value_args: &'static [bool],
    pub signature: &'static str,
    pub description: &'static str,
    pub imp: FnImpl,
}

Fields

name: &'static str

Upper-case, without any _xlfn. prefix.

min_args: usize

max_args: usize

usize::MAX for variadic functions (Excel allows 255 arguments).

category: Category

volatile: bool

scalar_args: &'static [bool]

For automatic array lifting: true for each parameter position that expects a scalar. When an argument at a scalar position is an array, the function is applied element-wise (broadcast like Excel’s dynamic arrays). The last entry repeats for variadic tails; an empty slice means no lifting.

value_args: &'static [bool]

Parameter positions that take a single value and reject a reference to more than one cell with #VALUE! (the Analysis ToolPak functions: EOMONTH, WORKDAY, COUPDAYS, BIN2DEC…), where other scalar parameters lift the range. Arrays that aren’t references still lift. Same layout as scalar_args; filled at registration from [lift::value_args].

signature: &'static str

description: &'static str

imp: FnImpl

Implementations

impl FnSpec

pub fn is_scalar_arg(&self, i: usize) -> bool

Whether parameter i expects a scalar (and is therefore lifted over arrays).

pub fn is_value_arg(&self, i: usize) -> bool

Whether parameter i takes a single value, so a multi-cell reference there is #VALUE!.

pub fn accepts(&self, n: usize) -> bool

Whether a call with n arguments is valid (Excel allows at most 255).

Trait Implementations

impl Debug for FnSpec

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

Formats the value using the given formatter.