|  | // Copyright 2022 The Dawn Authors | 
|  | // | 
|  | // 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 container | 
|  |  | 
|  | // key is the constraint for container keys. | 
|  | // As Map and Set sort before returning a slice, the constraint is equivalent to | 
|  | // the constraints.Ordered in x/exp, instead of 'comparable': | 
|  | // https://cs.opensource.google/go/x/exp/+/master:constraints/constraints.go | 
|  | type key interface { | 
|  | ~int | ~int8 | ~int16 | ~int32 | ~int64 | ~uint | ~uint8 | ~uint16 | | 
|  | ~uint32 | ~uint64 | ~uintptr | ~float32 | ~float64 | ~string | 
|  | } |