ego008
ego008
2345 0 0

优化struct 结构,减少内存分配

代码

package main

import (
"fmt"
"unsafe"
)

type myStruct struct {
myInt    bool    // 1 byte
myFloat  float64 // 8 bytes
myBool   int32   // 4 bytes
myString string  // 8 bytes
}

type myStructOptimized struct {
myFloat  float64 // 8 bytes
myString string  // 8 bytes
myInt    int32   // 4 bytes
myBool   bool    // 1 byte
}

func main() {
a := myStruct{}
b := myStructOptimized{}

fmt.Println(unsafe.Sizeof(a)) // unordered 40 bytes
fmt.Println(unsafe.Sizeof(b)) // ordered 32 bytes
}

原理:

来源 http://t.cn/RnQlAWM

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