/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ /*! * Copyright (c) 2018 by Contributors * \brief Sample golang application to demonstrate go-closure given to a packed function argument. * \file pack_func_closure_arg.go */ package main import ( "fmt" "./gotvm" ) // sampleFunctionArg receives a Packed Function handle and calls it. func sampleFunctionArg(args ...*gotvm.Value) (retVal interface{}, err error) { // Reveive Packed Function Handle pfunc := args[0].AsFunction() // Call Packed Function retVal, err = pfunc.Invoke(args[1].AsInt64(), args[2].AsInt64()) return } // main func main() { // Not passing a function name implicitely // picks the name from reflection as "main.sampleDunctionArg" gotvm.RegisterFunction(sampleFunctionArg); fmt.Printf("Registered: sampleFunctionArg\n") // Get registered global function. funp, err := gotvm.GetGlobalFunction("main.sampleFunctionArg") if err != nil { fmt.Print(err) return } fmt.Printf("GetGlobalFunction: main.sampleFunctionArg - Success\n") // funccall is a simple golang callback function like C = A + B. funccall := func (args ...*gotvm.Value) (retVal interface{}, err error) { for _, v := range args { fmt.Printf("ARGS:%T : %v\n", v.AsInt64(), v.AsInt64()) } val1 := args[0].AsInt64() val2 := args[1].AsInt64() retVal = int64(val1+val2) return } // Call function result, err := funp.Invoke(funccall, 30, 50) if err != nil { fmt.Print(err) return } fmt.Printf("Invoked sampleFunctionArg with function closure arg : Result:%v\n", result.AsInt64()) }