小编rod*_*ito的帖子

我遇到了一个适用于结构的扩展方法,(SomeStruct)并返回该值是否等于default(SomeStruct)(当调用无参数构造函数时).

public static bool IsDefault<T> (this T value)
    where T : struct
{
    return (!EqualityComparer<T>.Default.Equals(value, default(T)));
}

这让我想知道结构是否被装箱.这纯粹是出于好奇,因为根据上下文有拳击/传递值的优点/缺点.

假设:

1. 以下第一种方法是非法的,因为结构不会隐式覆盖相等运算符==/!=.
2. 第二个"出现"以避免拳击.
3. 第三种方法应该始终对结构进行封装,因为它正在调用object.Equals(object o).
4. 第四个有两个重载可用(object/T)所以我认为它也将避免拳击.但是,目标结构需要实现IEquatable<T>接口,使得辅助扩展方法不是很有用.

变化:

public static bool IsDefault<T> (this T value)
    where T : struct
{
    // Illegal since there is no way to know whether T implements the ==/!= operators.
    return (value == default(T));
}

public static bool IsDefault<T> (this T value)
    where T : struct …

UPDATE

This issue is partially resolved, the problem now lies in authenticating the ApiGateway request. I am unsure of how to acquire the necessary tokens to send with the request so that it is valid, because this is a [serverless-framework] service so I can't use the AWS Console to copy paste the tokens into the request's json data. Moreover, I wouldn't know what json key they'd have to be under anyways. So I guess this question has changed considerably in …