如何强制用户仅通过operator new创建对象？ [英] How do I enforce the user create a object via operator new only?
问题描述
大家好，
我有一个问题，你能帮助我吗？
如何强制用户通过new new创建一个对象？
例如，有一个C类：
class C
{
.. ...
}
然后用户只能创建一个C对象：
C * p = new C;
和
C c;
是禁止的。
有没有办法实现它？
谢谢！
Hello every,
I have a question, could you help me?
How do I enforce the user create a object via operator new only?
For example, there is a class C:
class C
{
.....
}
Then the user can only create a C object with:
C* p = new C;
and
C c;
is forbided.
Are there some ways to implement it?
Thanks!
推荐答案
Xie Yubo写道：
Xie Yubo wrote:
你好每一个，
我有一个问题，你能帮助我吗？
如何强制用户通过运营商创建一个对象只有新的？
例如，有一个C类：
class C
{
.....
}
然后用户只能创建一个C对象：
C * p =新C;
和
C. c;
是禁止的。
有没有办法实现它？
Hello every,
I have a question, could you help me?
How do I enforce the user create a object via operator new only?
For example, there is a class C:
class C
{
.....
}
Then the user can only create a C object with:
C* p = new C;
and
C c;
is forbided.
Are there some ways to implement it?
Make构造函数私有和私有一个朋友函数返回一个
类的实例。
class X
{
X（）{}
朋友X * makeX（）{返回新X; }
};
-
Ian Collins。
Make the constructor private and private a friend function to return an
instance of the class.
class X
{
X() {}
friend X* makeX() { return new X; }
};
--
Ian Collins.
在文章< 11 ********************* @ h3g2000cwc.googlegroups.c om>，
xi ***** @ gmail.com 说...
In article <11*********************@h3g2000cwc.googlegroups.c om>,
xi*****@gmail.com says...
Hello every，
我有一个问题，你能帮帮我吗？
如何强制用户只通过operator new创建一个对象？
Hello every,
I have a question, could you help me?
How do I enforce the user create a object via operator new only?
[...]
FAQ，16.21
-
后来，
杰瑞。
宇宙是自己想象的虚构。
[ ... ]
FAQ, 16.21
--
Later,
Jerry.
The universe is a figment of its own imagination.
1月29日上午7:27，Ian Collins< ian-n ... @ hotmail.comwrote：
On Jan 29, 7:27 am, Ian Collins <ian-n...@hotmail.comwrote:
谢Yubo写道：
Xie Yubo wrote:
你好每一个，
我有一个问题，你能帮助我吗？
如何强制用户仅通过operator new创建对象？
Hello every,
I have a question, could you help me?
How do I enforce the user create a object via operator new only?
例如，有一个C类：
For example, there is a class C:
class C $ / $
{
.....
}
class C
{
.....
}
然后用户只能创建一个C对象：
C * p = new C;
和
C c;
是禁止的。
Then the user can only create a C object with:
C* p = new C;
and
C c;
is forbided.
有没有办法实现它？让构造函数私有和私有的朋友函数返回
Are there some ways to implement it?Make the constructor private and private a friend function to return an
班级实例。
class X
{
X（）{}
朋友X * makeX（）{返回新X; }
}; -
Ian Collins。
instance of the class.
class X
{
X() {}
friend X* makeX() { return new X; }
};--
Ian Collins.
但是这样，用户只能使用X * p = makeX（）;不是X * p =新X;
But in this way, the user only use X* p = makeX(); not X* p = new X;
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