Question

如何获取函数的返回值长度，效果如下：

func Foo() (int, int){
    ...
}
func Bar() (int, float, bool, string, error){
    ...
}
n1 := getReturnLength(Foo) // shall be 2
n2 := getReturnLength(Bar) // shall be 5

我应该如何实现getReturnLength功能或类似功能？

Answer 1

您可以使用反射包来实现。

reflect.TypeOf(Foo).NumOut()

您可以在https://golang.org/pkg/reflect/#Type

了解有关反射包的信息

Answer 2

您不应使用反射将函数的返回值放入切片中。相反，您应该在结果范围内返回切片迭代

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;


public class UnityMainThreadDispatcher : MonoBehaviour {

private static readonly Queue<Action> _executionQueue = new Queue<Action>();


/// <summary>
/// Locks the queue and adds the IEnumerator to the queue
/// </summary>
/// <param name="action">IEnumerator function that will be executed from the main thread.</param>
public void Enqueue(IEnumerator action) {
    lock (_executionQueue) {
        _executionQueue.Enqueue (() => {
            StartCoroutine (action);
        });
    }
}

/// <summary>
/// Locks the queue and adds the Action to the queue
/// </summary>
/// <param name="action">function that will be executed from the main thread.</param>
public void Enqueue(Action action)
{
    Enqueue(ActionWrapper(action));
}
IEnumerator ActionWrapper(Action a)
{
    a();
    yield return null;
}


private static UnityMainThreadDispatcher _instance = null;

public static bool Exists() {
    return _instance != null;
}

public static UnityMainThreadDispatcher Instance() {
    if (!Exists ()) {
        throw new Exception ("UnityMainThreadDispatcher could not find the UnityMainThreadDispatcher object. Please ensure you have added the MainThreadExecutor Prefab to your scene.");
    }
    return _instance;
}

void Awake() {
    if (_instance == null) {
        _instance = this;
        DontDestroyOnLoad(this.gameObject);
    }
}

public void Update() {
    lock(_executionQueue) {
        while (_executionQueue.Count > 0) {
            _executionQueue.Dequeue().Invoke();
        }
    }
}

void OnDestroy() {
        _instance = null;
}

}

如何确定函数返回的值数量

2 个答案: