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stack.go
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stack.go
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// Copyright 2022 Google LLC
//
// 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 stack
type Stack interface {
Pop() (Stack, interface{})
Push(o interface{}) Stack
Size() int
}
type stack []interface{}
func New() Stack {
return make(stack, 0)
}
func (s stack) Pop() (Stack, interface{}) {
return s[:len(s)-1], s[len(s)-1]
}
func (s stack) Push(o interface{}) Stack {
return append(s, o)
}
func (s stack) Size() int {
return len(s)
}