github.com/cloudwego/iasm@v0.2.0/expr/pools.go (about)

     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  }