github.com/cloudwego/frugal@v0.1.15/internal/rt/iface.go (about) 1 /* 2 * Copyright 2022 ByteDance Inc. 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 rt 18 19 import ( 20 `reflect` 21 ) 22 23 type Method struct { 24 Id int 25 Vt *GoType 26 } 27 28 func AsMethod(id int, vt *GoType) Method { 29 return Method { 30 Id: id, 31 Vt: vt, 32 } 33 } 34 35 func GetMethod(tp interface{}, name string) Method { 36 if tp == nil { 37 panic("value must be an interface pointer") 38 } else if vt := reflect.TypeOf(tp); vt.Kind() != reflect.Ptr { 39 panic("value must be an interface pointer") 40 } else if et := vt.Elem(); et.Kind() != reflect.Interface { 41 panic("value must be an interface pointer") 42 } else if mm, ok := et.MethodByName(name); !ok { 43 panic("interface " + vt.Elem().String() + " does not have method " + name) 44 } else { 45 return AsMethod(mm.Index, UnpackType(et)) 46 } 47 }