关于初始化的问题...... [英] A Question about initialization...

问题描述

我有一个具有静态成员变量的类。


string x;


x在使用过程中永远不会改变，应该初始化到abcd。


如何做到这一点？

解决方案

JustSomeGuy写道：

我有一个有静态成员变量的类。

字符串x;

x在使用过程中永远不会改变，应该初始化为abcd ;

如何做到这一点？

const string x =" abcd";


- Pete

JustSomeGuy写道：

我有一个有静态成员变量的类。

字符串x;

x在使用过程中永远不会改变，应该初始化为abcd。

如何做到这一点？

例如：

class X {

public：


static

const std :: string str; //首先申报。


}; // X


const std :: string X :: str（" abcd"）; //稍后初始化。

请注意，令我非常沮丧的是，


class X {

public：


static

const std :: string str（" abcd"）; // 一气呵成？不！


}; // X


确实*不*工作。实际上，我不知道原因。
最好


Kai-Uwe

"皮特C. < x@x.x>写道：

JustSomeGuy写道：

我有一个有静态成员变量的类。

字符串x;
<在使用过程中x应该永远不会改变，并且应该初始化为abcd。

如何做到这一点？

const string x =" ; abcd" ;;

你不能在课堂上这样做。你是正确的，成员有
是const，但初始化应该在构造函数中发生。


V

I have a class that has a static member variable.

string x;

x should never change during use and should be intialized to "abcd".

How does one do this?

解决方案

JustSomeGuy wrote:

I have a class that has a static member variable.

string x;

x should never change during use and should be intialized to "abcd".

How does one do this?

const string x = "abcd";

- Pete

JustSomeGuy wrote:

I have a class that has a static member variable.

string x;

x should never change during use and should be intialized to "abcd".

How does one do this?

For instance:
class X {
public:

static
const std::string str; // declare first.

}; // X

const std::string X::str ( "abcd" ); // initialize later.
Note that, to my great dismay,

class X {
public:

static
const std::string str ( "abcd" ); // in one go? no!

}; // X

does *not* work. Actually, I do not know the reason.
Best

Kai-Uwe

"Pete C." <x@x.x> wrote...

JustSomeGuy wrote:

I have a class that has a static member variable.

string x;

x should never change during use and should be intialized to "abcd".

How does one do this?

const string x = "abcd";

You cannot do this in a class. You''re correct that the member has
to be const, but the initialisation should happen in a constructor.

V

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