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precise_down

brokapi_bcs_protocol::utils::precision

Function precise_down 

Source 
pub fn precise_down(
    value: Decimal,
    step: Decimal,
) -> Result<Decimal, PrecisionError>
Expand description

Rounds a value down to the step grid.

Typical for a buy price: never pay more than the computed value.

§Errors

The same as value_to_steps_nearest.

§Examples

use brokapi_bcs_protocol::utils::precision::precise_down;
use rust_decimal::Decimal;

assert_eq!(precise_down(Decimal::new(10103, 2), Decimal::new(5, 2))?, Decimal::new(10100, 2));
// a whole-number step works too
assert_eq!(precise_down(Decimal::new(143, 1), Decimal::from(5))?, Decimal::from(10));