c08d48a50d
This alters some comments in source files, but is interested mainly in documentation files and help messages.
57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
// Package structs is for manipulating structures with reflection
|
|
package structs
|
|
|
|
import (
|
|
"reflect"
|
|
)
|
|
|
|
// SetFrom sets the public members of a from b
|
|
//
|
|
// a and b should be pointers to structs
|
|
//
|
|
// a can be a different type from b
|
|
//
|
|
// Only the Fields which have the same name and assignable type on a
|
|
// and b will be set.
|
|
//
|
|
// This is useful for copying between almost identical structures that
|
|
// are frequently present in auto-generated code for cloud storage
|
|
// interfaces.
|
|
func SetFrom(a, b interface{}) {
|
|
ta := reflect.TypeOf(a).Elem()
|
|
tb := reflect.TypeOf(b).Elem()
|
|
va := reflect.ValueOf(a).Elem()
|
|
vb := reflect.ValueOf(b).Elem()
|
|
for i := 0; i < tb.NumField(); i++ {
|
|
bField := vb.Field(i)
|
|
tbField := tb.Field(i)
|
|
name := tbField.Name
|
|
aField := va.FieldByName(name)
|
|
taField, found := ta.FieldByName(name)
|
|
if found && aField.IsValid() && bField.IsValid() && aField.CanSet() && tbField.Type.AssignableTo(taField.Type) {
|
|
aField.Set(bField)
|
|
}
|
|
}
|
|
}
|
|
|
|
// SetDefaults for a from b
|
|
//
|
|
// a and b should be pointers to the same kind of struct
|
|
//
|
|
// This copies the public members only from b to a. This is useful if
|
|
// you can't just use a struct copy because it contains a private
|
|
// mutex, e.g. as http.Transport.
|
|
func SetDefaults(a, b interface{}) {
|
|
pt := reflect.TypeOf(a)
|
|
t := pt.Elem()
|
|
va := reflect.ValueOf(a).Elem()
|
|
vb := reflect.ValueOf(b).Elem()
|
|
for i := 0; i < t.NumField(); i++ {
|
|
aField := va.Field(i)
|
|
// Set a from b if it is public
|
|
if aField.CanSet() {
|
|
bField := vb.Field(i)
|
|
aField.Set(bField)
|
|
}
|
|
}
|
|
}
|