Golang’s method of determining whether a pointer is empty:
1. When you know the type, you can naturally use type assertions and then determine whether it is empty. For example, ai, ok := i.(*int), and then judge ai == nil.
2. If I don’t know what type of pointer it is, I have to use reflection vi := reflect.ValueOf(i), and then use vi.IsNil() to judge. But if i is not a pointer, an exception will occur when calling IsNil. You may need to write a function like this to detect null
func IsNil(i interface{}) bool {
defer func() {
recover()
}()
vi := reflect.ValueOf(i)
return vi.IsNil()
}But it is really not good-looking to impose a defer recover like this, so I use type judgment. It becomes like this
func IsNil(i interface{}) bool {
vi := reflect.ValueOf(i)
if vi.Kind() == reflect.Ptr {
return vi.IsNil()
}
return false
}For more golang knowledge, please pay attention to the golang tutorial column on the PHP Chinese website.
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