https://github.com/joinframework/dconv

Double conversion
https://github.com/joinframework/dconv

conversion floating-point grisu2

Last synced: 3 months ago
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Double conversion

• Host: GitHub
• URL: https://github.com/joinframework/dconv
• Owner: joinframework
• License: mit
• Created: 2021-05-17T07:37:54.000Z (about 5 years ago)
• Default Branch: main
• Last Pushed: 2025-12-04T23:43:00.000Z (6 months ago)
• Last Synced: 2025-12-07T22:10:12.617Z (6 months ago)
• Topics: conversion, floating-point, grisu2
• Language: C++
• Homepage: https://joinframework.net
• Size: 455 KB
• Stars: 0
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# dconv

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**dconv** is a C++14 library for printing and parsing floating point numbers.

Double to string conversion is done using the **Grisu2** algorithm, described by **Florian Loitsch** in its publication [Printing Floating-Point Numbers Quickly and Accurately with Integers](https://florian.loitsch.com/publications).

String to double conversion uses a fast-path implementation based on the **Eisel-Lemire** algorithm, with automatic fallback to strtod when inputs exceed the range or precision safely handled by the fast algorithm.

The code is far from being perfect so any help to improve speed, accuratie, code quality etc... is welcome.

## Dependencies

To install **dconv** dependencies do this:

```bash

sudo apt update && sudo apt install libgtest-dev libgmock-dev

```

## Download

To download the latest source do this:

```bash

git clone https://github.com/mrabine/dconv.git

```

## Configuration

To configure **dconv** do this:

```bash

cmake -B build -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Debug -DDCONV_ENABLE_TESTS=ON -DDCONV_ENABLE_COVERAGE=ON

```

## Build

To build **dconv** do this:

```bash

cmake --build build --config Debug

```

## Usage

The printing API can be used this way:

```cpp

#include 

char value [25];

char* end = dconv::dtoa (value, -2.22507e-308);

```

The parsing API can be used this way:

```cpp

#include 

double value;

char* end = dconv::atod ("-2.22507e-308", value);

```

## License

[MIT](https://choosealicense.com/licenses/mit/)