RangePermute 1.0.1

.NET Core 2.1 .NET Framework 4.0 
dotnet add package RangePermute --version 1.0.1
NuGet\Install-Package RangePermute -Version 1.0.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="RangePermute" Version="1.0.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add RangePermute --version 1.0.1
#r "nuget: RangePermute, 1.0.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
// Install RangePermute as a Cake Addin
#addin nuget:?package=RangePermute&version=1.0.1

// Install RangePermute as a Cake Tool
#tool nuget:?package=RangePermute&version=1.0.1

RangePermute

Memory efficient psuedo-randomly permuted enumerator for C#/.NET to enumerate gigantic ranges.

Say you want to generate a random permutation of numbers in range [0-2^50), without duplicates. Naive approach to get decent pseudo-random permutations would need prohibitively large amount of memory. This library can generate such enumerations using constant memory, and is suitable for Linq-style consumption.

With UInt64, currently we can support 2^64. Can easily be modified to support range up-to 2^128. Internals are 128-bit already.

using RangePermute;
...
foreach(var idx in RangeEnumerable.Range(100000000))
{
    // do something with idx
    // idx will be between 0 (inclusive) and 100000000 (exlusive)
    ...
}

Relevant reading:

  • Luby, Michael, and Charles Rackoff. "How to Construct Pseudorandom Permutations from Pseudorandom Functions." SIAM Journal on Computing, vol. 17, no. 2, 1988, pp. 373–386.
  • Black, John, and Phillip Rogaway. "Ciphers with Arbitrary Finite Domains." The Cryptographers Track at the Rsa Conference, 2002. [http://web.cs.ucdavis.edu/~rogaway/papers/subset.pdf]

Credits

Pretty much a C# port of https://pypi.python.org/pypi/shuffled/ .

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Framework net40 net403 net45 net451 net452 net46 net461 net462 net463 net47 net471 net472 net48 net481
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

  • .NETCoreApp 2.1

    • No dependencies.

  • .NETFramework 4.0

    • No dependencies.

  • .NETFramework 4.5

    • No dependencies.

  • .NETFramework 4.6

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last updated
1.0.1 532 3/19/2019
1.0.0 893 2/23/2018

First release.