Struct SymbolMeta 

#[repr(C)]
pub struct SymbolMeta {
    pub tick_size_1e9: u64,
    pub lot_size_1e8: u64,
    pub min_qty_1e8: u64,
    pub min_notional_1e9: u64,
    pub price_precision: u8,
    pub qty_precision: u8,
    pub _pad: [u8; 6],
}

Symbol trading specifications from the exchange. Injected by runtime — prevents rejects from wrong lot size / tick size. Fields set to 0 mean “unknown” — helpers return input unchanged.

Fields

tick_size_1e9: u64

Minimum price increment (1e9 scaled, e.g. 10_000_000 = $0.01). 0 = unknown.

lot_size_1e8: u64

Minimum qty increment (1e8 scaled, e.g. 1_000_000 = 0.01 units). 0 = unknown.

min_qty_1e8: u64

Minimum order quantity (1e8 scaled). 0 = unknown.

min_notional_1e9: u64

Minimum order notional value (1e9 scaled, e.g. 10_000_000_000 = $10). 0 = no minimum.

price_precision: u8

Price decimal precision (e.g. 2 = $100.00).

qty_precision: u8

Quantity decimal precision (e.g. 8 = 0.00000001).

_pad: [u8; 6]

Implementations

impl SymbolMeta

pub const EMPTY: Self

pub fn round_px(&self, px_1e9: u64) -> u64

Round price DOWN to nearest tick. Returns raw if tick_size == 0 (unknown).

pub fn round_qty(&self, qty_1e8: i64) -> i64

Round qty DOWN to nearest lot. Returns raw if lot_size == 0 (unknown).

pub fn check_notional(&self, qty_1e8: i64, px_1e9: u64) -> bool

Check min notional. Returns true if unknown (0) — skip check, don’t false-reject.

pub fn check_min_qty(&self, qty_1e8: i64) -> bool

Check min quantity. Returns true if unknown (0).

Trait Implementations

impl Clone for SymbolMeta

fn clone(&self) -> SymbolMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SymbolMeta

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

Formats the value using the given formatter.

impl Default for SymbolMeta

fn default() -> Self

Returns the “default value” for a type.

impl Copy for SymbolMeta