Bitmap

Simple bitmaps in Go.

Provides the following methods on bitmap objects:

• Get(bit int)
• Set(bit int, value bool)
• Toggle(bit)
• GetAtomic(bit int)
• SetAtomic(bit int, value bool)
• ToggleAtomic(bit int)

Example

    m := bitmap.New(127)
    m.Set(42, true)
    if m.Get(42) {
        // OK
    }

Why?

There are already a few bitmap implementations in Go available out there, however they have some shortfalls and/or are too complex for what a bitmap should do.

• boljen’s go-bitmap has separate implementations for Bitmap/Concurrent/Threadsafe, and complexifies a lot what should be very simple.
• ShawnMilo’s bitmap has a nice feel but lacks atomic methods and adds string methods using json/gzip/base64 (?)
• Roaring Bitmaps are simply too complex for what I need bitmaps for. You should however definitely use that if you store more than 200k bits or so in total.