Added bit flags

bit_flags.go

@@ -0,0 +1,9 @@
+package astikit
+
+type BitFlags uint64
+
+func (fs BitFlags) Add(f uint64) uint64 { return uint64(fs) | f }
+
+func (fs BitFlags) Del(f uint64) uint64 { return uint64(fs) &^ f }
+
+func (fs BitFlags) Has(f uint64) bool { return uint64(fs)&f > 0 }

bit_flags_test.go

@@ -0,0 +1,23 @@
+package astikit
+
+import (
+	"testing"
+)
+
+func TestBitFlags(t *testing.T) {
+	f := BitFlags(2 | 4)
+	r := f.Add(1)
+	if e, g := uint64(7), r; e != g {
+		t.Errorf("expected %d, got %d", e, g)
+	}
+	r = f.Del(2)
+	if e, g := uint64(4), r; e != g {
+		t.Errorf("expected %d, got %d", e, g)
+	}
+	if e, g := false, f.Has(1); e != g {
+		t.Errorf("expected %v, got %v", e, g)
+	}
+	if e, g := true, f.Has(4); e != g {
+		t.Errorf("expected %v, got %v", e, g)
+	}
+}