# Flint2
**Flint2** provides a thin Haskell wrapper for [Flint](https://flintlib.org) C-library. 

## Installation

Clone it with

```bash
git clone https://github.com/monien/Flint2.git
```

then goto to the Flint2 directory and use

```bash
stack install
stack haddock
```

Have a look at the **Main.hs** in the **app** directory first and then use
As long as Flint2 is not available from Stackage (Hackage) this requires specification of
the location of Flint2 in the global stack.yaml file which might be either a local directory
or github commit. See the [stack](https://docs.haskellstack.org/en/stable/GUIDE/) documentation for details.

```bash
stack install Flint2
stack haddock Flint2
```

This will install a binary **flint_test** in **~/.local/bin** which is just shows the basic functionality of the current Flint2 wrapper.

```bash
stack ghci
```
for Flint2 in a haskell shell. 

## Quick Start

A simple program using the thin wrapper would be

```haskell
import Data.Number.Flint

main = do 
  x <- newFmpz
  y <- newFmpz
  withFmpz x $ \x -> do
    withFmpz y $ \y -> do
      fmpz_set_ui x 7
      fmpz_set_ui y 6
      fmpz_mul x x y
      fmpz_print x  
```

which will print the numerical value 42.

In the app directory more practical information on how to use the thin wrapper can be found. 
The above example simplifies to 

```haskell
include Fmpz

main = do
  let x = 7 :: Fmpz 
      y = 6 :: Fmpz
  print $ x*y
  print $ factor (42 :: Fmpz)
  
```

which prints 

```
42 
[(2,1),(3,1),(7,1)]
```