高手你能告诉我吗?

[bluecrest]

1.why?
int & Add(int & x)
{
// 下面一行错误，故屏蔽掉
// return (x++); // 错误：返回值不可以是一个临时值

x++;
return (x);
}


2刚开始学习,不知道下面东东是什么?
__published:

[xrbeck]

1.函数返回的是个引用类型。代表的是另外一个变量。出栈后释放。所以不能安全返回
2。是BCB封装的关键字。代表控件的属性。

[azurecrystal]

2，表示在其中声明的方法和属性可在对象监视器中看到，并修改属性

[azurecrystal]

1，把x++变成++x试试

[whitelion]

c

[ExitWindows]

up

[flame3]

__published

The __published keyword specifies that properties in that section are displayed in the Object Inspector, if the class is on the Component palette. Only classes derived from TObject can have __published sections.
The visibility rules for published members are identical to those of public members. The only difference between published and public members is that Object Pascal-style runtime type information (RTTI) is generated for data members and properties declared in a __published section. RTTI enables an application to dynamically query the data members, member functions, and properties of an otherwise unknown class type.

Note: No constructors or destructors are allowed in a __published section. Properties, Pascal intrinsic or VCL derived data-members, member functions, and closures are allowed in a __published section. Fields defined in a __published section must be of a class type. Properties defined in a __published section cannot be array properties. The type of a property defined in a __published section must be an ordinal type, a real type, a string type, a small set type, a class type, or a method pointer type.

[flame3]

如果在构件板上有这个类，这个__publish关键词指定了显示在对象查看器中显示的部分的属性。只有源于TObject的类有__publish部分。
译的不好，下面的自己看吧，在帮助里有。