#decimal #financial #fixed #precision

macro rust_decimal_macro_impls

Shorthand macros to assist creating Decimal types. Do not depend on this directly; use rust_decimal_macros

9 stable releases

✓ Uses Rust 2018 edition

new 1.4.0 Mar 23, 2020
1.3.0 Feb 28, 2020
1.2.0 Jan 24, 2020
1.1.0 Dec 27, 2019
0.11.1 Feb 11, 2019

#270 in Data structures

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2,112 downloads per month
Used in 7 crates (via rust_decimal_macros)

MIT license

140KB
3K SLoC

Decimal   Build Status Latest Version

A Decimal implementation written in pure Rust suitable for financial calculations that require significant integral and fractional digits with no round-off errors.

The binary representation consists of a 96 bit integer number, a scaling factor used to specify the decimal fraction and a 1 bit sign. Because of this representation, trailing zeros are preserved and may be exposed when in string form. These can be truncated using the normalize or round_dp functions.

Documentation

Usage

Decimal numbers can be created in a few distinct ways. The easiest and most optimal method of creating a Decimal is to use the procedural macro within the rust_decimal_macros crate:

// Procedural macros need importing directly
use rust_decimal_macros::*;

let number = dec!(-1.23);

Alternatively you can also use one of the Decimal number convenience functions:

use rust_decimal::Decimal;

// Using an integer followed by the decimal points
let scaled = Decimal::new(202, 2); // 2.02

// From a string representation
let from_string = Decimal::from_str("2.02").unwrap(); // 2.02

// Using the `Into` trait
let my_int : Decimal = 3i32.into();

// Using the raw decimal representation
// 3.1415926535897932384626433832
let pi = Decimal::from_parts(1102470952, 185874565, 1703060790, false, 28);

Features

postgres

This feature enables a PostgreSQL communication module. It allows for reading and writing the Decimal type by transparently serializing/deserializing into the NUMERIC data type within PostgreSQL.

tokio-pg

Enables the tokio postgres module allowing for async communication with PostgreSQL.

serde-float

Enable this so that JSON serialization of Decimal types are sent as a float instead of a string (default).

e.g. with this turned on, JSON serialization would output:

{
  "value": 1.234
}

Dependencies

~0.6–0.8MB
~15K SLoC