Update

Author: dim13

.github/workflows/go.yml

@@ -15,15 +15,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v5
+
     - name: Set up Go 1.x
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v6
       with:
         go-version: 1.x
       id: go
 
-    - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
-
     - name: Build
       run: go build -v ./...
 

README.md

@@ -1,4 +1,4 @@
 # variable-lenght bitfield
 
-[![GoDoc](https://godoc.org/github.com/dim13/bit?status.svg)](https://godoc.org/github.com/dim13/bit)
-[![Build](https://github.com/dim13/bit/workflows/build/badge.svg)](https://github.com/dim13/bit/actions)
+[![Go Reference](https://pkg.go.dev/badge/github.com/dim13/bit.svg)](https://pkg.go.dev/github.com/dim13/bit)
+[![Go](https://github.com/dim13/bit/actions/workflows/go.yml/badge.svg)](https://github.com/dim13/bit/actions/workflows/go.yml)

bit.go

@@ -32,3 +32,12 @@ func (f *Field) IsClear(k int) bool {
 	n, m := k>>3, byte(1<<uint(k&7))
 	return len(*f) <= n || (*f)[n]&m == 0
 }
+
+func (f *Field) Shrink() {
+	for i := len(*f); i > 0; i-- {
+		if (*f)[i-1] != 0 {
+			break
+		}
+		*f = (*f)[:i-1]
+	}
+}

bit_test.go

@@ -18,3 +18,15 @@ func TestBit(t *testing.T) {
 		}
 	}
 }
+
+func TestShrink(t *testing.T) {
+	bf := new(Field)
+	bf.Set(0)
+	bf.Set(32)
+	bf.Set(64)
+	t.Log(bf)
+	bf.Clear(64)
+	bf.Shrink()
+	bf.Set(128)
+	t.Log(bf)
+}