英文:
Creating a function in Go with generic type parameters
问题
我正在尝试创建一个通用函数，可以接受一个键字符串和一个对象的引用。
该函数读取键的内容，该内容是原始对象的序列化字节数组，并将其（反序列化）赋值给相同类型的空结构。该函数希望是通用的，因此可以序列化类型A、B或[]C。
以下是我尝试的代码：
func GetObject(key string, thing interface{}) error {
var buf bytes.Buffer
dec := gob.NewDecoder(&buf)
err := dec.Decode(thing)
if err != nil {
log.Errorf(cs.ctx, "cloud store - GetObject - decode error:", err)
return err
}
return nil
}
这是我尝试调用上述函数的方式：
newThing := MyStruct{}
err := GetObject("a123", &newThing)
关于最后几行会导致运行时错误：
decode error:%!(EXTRA *errors.errorString=EOF)
问题：
- 对于这个目的，接口的方法是否正确（允许函数通用使用）？
- 使用Gob进行序列化时出现问题。有没有关于如何纠正这个问题的建议？
英文:
I am trying to create a generic function that can accept a key string and a reference to an object.
The function reads a key's content, which is a serialized byte array out of an original object of the same type and it should assign that (deserializing) to an empty structure of that same type. The function wants to be generic, so it can serialize a type A as well as B or []C
Here is what I tried to do:
func GetObject(key string, thing interface{}) error {
var buf bytes.Buffer
dec := gob.NewDecoder(&buf)
err := dec.Decode(thing)
if err != nil {
log.Errorf(cs.ctx, "cloud store - GetObject - decode error:", err)
return err
}
return nil
}
This is how I try to invoke the above function:
newThing := MyStruct{}
err := GetObject("a123", &newThing)
The last lines about cause a runtime error:
decode error:%!(EXTRA *errors.errorString=EOF)
the question:
- is the interface approach correct for this purpose (allow the function be used generically) ?
- The serialization error ( using Gob ) seems to be problematic. Any suggestions on how to rectify that ?
答案1
得分: 1
接口的概念是正确的。问题与持久化存储中缺少的getter方法以及如何将其[]byte内容创建为缓冲区有关：
func GetObject(key string, thing interface{}) error {
content, _ := SomePersistanceStoreGet(fileName)
buffer := bytes.NewBuffer(content)
dec := gob.NewDecoder(buffer)
err := dec.Decode(thing)
if err != nil {
log.Errorf("decode error: %v", err)
return err
}
return nil
}
英文:
The concept of interfaces is correct. The issue was related to a missing getter from the persistence store and how to create a buffer out of its []byte content:
func GetObject(key string, thing interface{}) error {
content, _ := SomePersistanceStoreGet(fileName)
buffer := bytes.NewBuffer(content)
dec := gob.NewDecoder(buffer)
err := dec.Decode(thing)
if err != nil {
log.Errorf("decode error: %v", err)
return err
}
return nil
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论