Tardigrade Backend: Dependencies

vendor/github.com/spacemonkeygo/errors/data_keys.go

@@ -0,0 +1,32 @@
+// Copyright (C) 2014 Space Monkey, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package errors
+
+import (
+	"sync/atomic"
+)
+
+var (
+	lastId int32 = 0
+)
+
+// DataKey's job is to make sure that keys in each error instances namespace
+// are lexically scoped, thus helping developers not step on each others' toes
+// between large packages. You can only store data on an error using a DataKey,
+// and you can only make DataKeys with GenSym().
+type DataKey struct{ id int32 }
+
+// GenSym generates a brand new, never-before-seen DataKey
+func GenSym() DataKey { return DataKey{id: atomic.AddInt32(&lastId, 1)} }