C＃2.0：struct&类约束 [英] C#2.0: struct & class constraints
问题描述
您好。
为什么以下代码是在vs2005beta2中编译的？
class C< S，T>
其中S ：struct，T
其中T：class
{}
1. S如何既是值类型又是引用-type？
2.有人可以给出C型正确实例的例子吗？
-
Alex。
Hello.
Why following code is compiled in vs2005beta2?
class C<S,T>
where S : struct, T
where T : class
{}
1. How S can be both value-type and reference-type?
2. Can anybody give example of correct instantiation of type C?
--
Alex.
推荐答案
> 1. S如何既可以是值类型又可以是引用类型？
结构（即使在.NET 1.1中）是特殊类型，它们是值类型，但具有某些语义
引用类型，但实际上是值类型。
-
Chad Z. Hower（又名Kudzu） - http://www.hower.org/Kudzu/
编程是反击的艺术形式
使用IntraWeb让你的ASP.NET运转起来！
http://www.atozed.com/IntraWeb/
> 1. How S can be both value-type and reference-type?
Structs (Even in .NET 1.1) are special types that are value types, but have certain semantics of
reference type, but in fact are value types.
--
Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/
"Programming is an art form that fights back"
Get your ASP.NET in gear with IntraWeb!
http://www.atozed.com/IntraWeb/
2005年6月18日星期六14 ：06：46 +0400，Alex Sedow
< al ** @ csharpparser.com>写道：
On Sat, 18 Jun 2005 14:06:46 +0400, "Alex Sedow"
<al**@csharpparser.com> wrote:
你好。
为什么在vs2005beta2中编译下面的代码？
C类< S，T>
其中S： struct，T
其中T：class
{}
1。 S可以是值类型还是引用类型？
不可能，而且上述陈述实际上并没有这么说。它实际上是这样说的：
：
* S是结构
* T是类
* S isa T（换句话说，S是T，S继承自T或S实现T）
2.任何人都能举例说明C类型的正确实例吗？
Hello.
Why following code is compiled in vs2005beta2?
class C<S,T>
where S : struct, T
where T : class
{}
1. How S can be both value-type and reference-type?
It can''t and the above statement doesn''t actually say that. It
actually says the following:
* S is struct
* T is class
* S isa T (In other words, S is T, S inherit from T or S implement T)
2. Can anybody give example of correct instantiation of type C?
C< int，object> a;
C< int，System.ValueType> b;
以上两个声明都遵循三个规则，因为int确实
确实从System.ValueType和Object继承。
-
MarcusAndrén
C<int, object> a;
C<int, System.ValueType> b;
Both the above declarations follows the three rules since int does
indeed inherit from System.ValueType and Object.
--
Marcus Andrén
谢谢Marcus！
你们非常帮助我。
-
Alex。
Thanks Marcus!
You very help me.
--
Alex.
1。 S如何既可以是值类型又可以是引用类型？
1. How S can be both value-type and reference-type?
它不能和上面的语句实际上并没有这么说。它实际上说的如下：
* S是结构
* T是类
* S isa T（换句话说，S是T，S继承自T或S实现T）
It can''t and the above statement doesn''t actually say that. It
actually says the following:
* S is struct
* T is class
* S isa T (In other words, S is T, S inherit from T or S implement T)
2。任何人都可以给出C型正确实例化的例子吗？
2. Can anybody give example of correct instantiation of type C?
C< int，object> a;
C< int，System.ValueType> b;
以上两个声明都遵循三个规则，因为int确实从System.ValueType和Object继承。
-
MarcusAndrén
C<int, object> a;
C<int, System.ValueType> b;
Both the above declarations follows the three rules since int does
indeed inherit from System.ValueType and Object.
--
Marcus Andrén
这篇关于C＃2.0：struct&类约束的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
