Struct WriteOptions 

pub struct WriteOptions {
    pub format: NlFormat,
    pub precision: Option<u32>,
    pub comments: bool,
    pub nonfinite_strings: bool,
    pub aux_files: bool,
    pub functions: Vec<ImportedFunction>,
    pub suffixes: Vec<SuffixData>,
    pub defined_vars: Vec<DefinedVar>,
    pub dual_init: Vec<(u32, f64)>,
    pub complementarity: Vec<(usize, Complementarity)>,
}

Options for the writer.

Default::default() matches the writer’s original behaviour: ASCII output with trailing \t# ... comments, shortest-round-trip numeric formatting, and an error on NaN/Inf constants.

Fields

format: NlFormat

precision: Option<u32>

None -> shortest round-trip (default Rust {} for f64). Some(n) -> n significant digits in scientific notation ({:.*e}, e.g. 3.142e0).

comments: bool

Emit trailing \t# ... comments in the header and segment introducers (ASCII format only). Ignored in binary mode.

nonfinite_strings: bool

When true, NaN/Inf numeric constants are emitted as Infinity / -Infinity / NaN strings (matching AMPL NL_LIB_GFMT). When false (default) the writer fails with IoError::InvalidNumber.

aux_files: bool

When true, a write_nl_files call also emits the sibling <stub>.row (constraint names) and <stub>.col (variable names) files next to the .nl, and populates the header’s max_name_len fields.

functions: Vec<ImportedFunction>

Imported function declarations (F segments). Empty by default.

suffixes: Vec<SuffixData>

Suffix entries (S segments). Empty by default.

defined_vars: Vec<DefinedVar>

Defined variables (V segments). Empty by default.

dual_init: Vec<(u32, f64)>

Dual seeds (d segment), sparse (constraint_nl_index, value) pairs.

complementarity: Vec<(usize, Complementarity)>

Complementarity entries for the r segment. Maps a constraint index to its complementarity info. Empty by default.

Implementations

impl WriteOptions

pub fn ascii() -> Self

ASCII with comments. Identity with Default::default().

pub fn ascii_lean() -> Self

ASCII, no trailing comments. Slimmer files for production use.

pub fn binary() -> Self

Binary b header. Comments are unused in binary mode.

Trait Implementations

impl Clone for WriteOptions

fn clone(&self) -> WriteOptions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WriteOptions

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

Formats the value using the given formatter.

impl Default for WriteOptions

fn default() -> Self

Returns the “default value” for a type.