关于对象的问题 [英] Question about objects
问题描述
有人可以向我解释，为什么在
下面的代码第二种方法不起作用？
感谢您的帮助。
#include< vector>
class Base {};
class继承：public Base {};
void foo（std :: vector< Basearg）{}
void main （）{
std :: vector< Inheritedv1;
v1.push_back（Inherited（））;
//工作
std :: vector< Basev2;
for（int i = 0; i< v1.size（）; v2.push_back（v1 [i ++]））;
foo（v2）;
//无法工作
foo（v1）;
}
Hi,
could someone please explain to me, why in the
following code the second approach does not work?
Thanks for your help.
#include <vector>
class Base {};
class Inherited : public Base{};
void foo(std::vector<Basearg) {}
void main() {
std::vector<Inheritedv1;
v1.push_back(Inherited());
// does work
std::vector<Basev2;
for(int i=0; i<v1.size(); v2.push_back(v1[i++]));
foo(v2);
// doesn''t work
foo(v1);
}
推荐答案
R2D2写道：
R2D2 wrote:
有人可以向我解释，为什么在
下面的代码第二种方法不起作用？
感谢您的帮助。
#include< v ector>
class Base {};
Hi,
could someone please explain to me, why in the
following code the second approach does not work?
Thanks for your help.
#include <vector>
class Base {};
因为它是C ++，这是一个C新闻组。
尝试comp.lang.c ++。当你在那里发布它时，将
main（）的返回类型更改为int，并解释你的意思是不起作用。
Brian
Because it''s C++, and this is a C newsgroup.
Try comp.lang.c++. When you post it there, change the return type of
main() to int, and explain what you mean by "does not work".
Brian
On 2007-08-28 19:13:17 -0400，" Default User" < de *********** @ yahoo.comsaid：
On 2007-08-28 19:13:17 -0400, "Default User" <de***********@yahoo.comsaid:
R2D2写道：
R2D2 wrote:
>
有人可以向我解释，为什么在
下面的代码第二种方法不起作用？
谢谢你的帮助。
#include< vector>
class Base {};
>Hi,
could someone please explain to me, why in the
following code the second approach does not work?
Thanks for your help.
#include <vector>
class Base {};
因为它是C ++，而且这是一个C新闻组。
Because it''s C++, and this is a C newsgroup.
对于某些未指定的值this。我没有读过comp.lang.c，但是我在读取comp.lang.c ++时读到了b $ b，这就是我正在阅读这条消息的地方。
-
Pete
Roundhouse Consulting，Ltd。（ www.versatilecoding.com ）
标准C ++库扩展：一个教程和参考的作者
（ www.petebecker.com/tr1book ）
For some unspecified value of "this". I don''t read comp.lang.c, but I
do read comp.lang.c++, and that''s where I''m reading this message.
--
Pete
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
(www.petebecker.com/tr1book)
R2D2写道：
R2D2 wrote:
有人可以向我解释，为什么在
以下代码第二种方法不起作用？
感谢您的帮助。
#include< vector>
class Base {};
class Inherited：public Base {};
Hi,
could someone please explain to me, why in the
following code the second approach does not work?
Thanks for your help.
#include <vector>
class Base {};
class Inherited : public Base{};
继承是一种基础;
http://www.parashift.com/c++-faq-lit....html#faq-19.3
但是
std :: vector< Inherited不是std :: vector< Base>
http://www.parashift.com/c++-faq-lit .... html＃faq-21.3
LR
Inherited is a kind of Base;
http://www.parashift.com/c++-faq-lit....html#faq-19.3
But
std::vector<Inheritedis not a std::vector<Base>
http://www.parashift.com/c++-faq-lit....html#faq-21.3
LR
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