1 //
2 // Copyright 2024 CloudWeGo Authors
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 // http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 17 package expr
18 19 import (
20 "sync"
21 )
22 23 var (
24 expressionPool sync.Pool
25 )
26 27 func newExpression() *Expr {
28 if v := expressionPool.Get(); v == nil {
29 return new(Expr)
30 } else {
31 return resetExpression(v.(*Expr))
32 }
33 }
34 35 func freeExpression(p *Expr) {
36 expressionPool.Put(p)
37 }
38 39 func resetExpression(p *Expr) *Expr {
40 *p = Expr{}
41 return p
42 }
43