PCG random number generator for Swift 4.2+

Swift implementation of a fast, space-efficient, and statistically excellent 64-bit random number generator using a PCG algorithm. Works as a drop in replacement to the default random number generator in Swift 4.2+.

Installation

Compatibility

Requires Swift 4.2+

Install Using Swift Package Manager

The Swift Package Manager is a decentralized dependency manager for Swift.

1. Add the project to your Package.swift.

   import PackageDescription
   
   let package = Package(
       name: "MyProject",
       dependencies: [
           .Package(url: "https://github.com/amarcu5/pcg-swift.git",
                    majorVersion: 1)
       ]
   )

2. Import the PermutedCongruentialGenerator module.

   import PermutedCongruentialGenerator

Usage

var pcg = PermutedCongruentialGenerator.shared

["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"].randomElement(using: &pcg)!
// "Wed"

["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"].shuffled(using: &pcg)
// ["Tue", "Mon", "Fri", "Thu", "Sun", "Sat", "Wed"]

Int.random(in: 1...6, using: &pcg)
// 5

Double.random(in: -1...1, using: &pcg)
// -0.5793378414800663