//
// Copyright 2024 CloudWeGo 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 expr

import (
	"sync"
)

var (
	expressionPool sync.Pool
)

func newExpression() *Expr {
	if v := expressionPool.Get(); v == nil {
		return new(Expr)
	} else {
		return resetExpression(v.(*Expr))
	}
}

func freeExpression(p *Expr) {
	expressionPool.Put(p)
}

func resetExpression(p *Expr) *Expr {
	*p = Expr{}
	return p
}