STL映射和内存管理（clear（）） [英] STL map and memory management (clear() )

问题描述

你好，

我有一张这样的STL地图（地图< string，Object *>

xyz;）

当我调用xyz.clear（）时会发生什么？

仅清除地图或地图和对象，以便内存

再次免费？

我是否要删除每一个对象？


感谢您的回复，

Jan

Hi there,
i''ve got an STL map with something like this ( map<string, Object*>
xyz; )
What happens when I call xyz.clear()?
Is only the map cleared or the map and the Objects, so that the memory
is free again?
Have I to delete every single Object?

Thanks for replying,
Jan

推荐答案

Jan写道：

你好，
我有一张这样的STL地图（地图< string，Object *>
xyz;）
当我调用xyz.clear（）时会发生什么？
只清除地图或地图和对象，以便记忆
再次免费？
我是否要删除每一个对象？

感谢您的回复，
Jan

Hi there,
i''ve got an STL map with something like this ( map<string, Object*>
xyz; )
What happens when I call xyz.clear()?
Is only the map cleared or the map and the Objects, so that the memory
is free again?
Have I to delete every single Object?

Thanks for replying,
Jan

clear（）清空地图的内容。对象*没有做任何事情

;特别是它不会删除它们。

clear() empties out the contents of the map. It doesn''t do anything
with the Object*; in particular it doesn''t delete them.

谢谢:-)

thanks :-)

Jan写道：

你好，
我有一个这样的STL地图（地图< string，对象*>
xyz;）
会发生什么当我调用xyz.clear（）？
只清除地图或地图和对象，以便内存
再次免费？
我是否要删除每一个对象？

感谢您的回复，
Jan

Hi there,
i''ve got an STL map with something like this ( map<string, Object*>
xyz; )
What happens when I call xyz.clear()?
Is only the map cleared or the map and the Objects, so that the memory
is free again?
Have I to delete every single Object?

Thanks for replying,
Jan

没有STL容器会删除指针类型。

我建议你使用智能指针而不是STL

容器的原始指针。

你不能将auto_ptr用于STL容器，但你可以使用其他

常见的智能指针，如boost :: shared_ptr和克隆指针，如

copy_ptr和cow_ptr。

http ：//www.boost.org/libs/smart_ptr/shared_ptr.htm

http://code.axter.com/copy_ptr.h
http://code.axter.com/cow_ptr.h

None of the STL containers will delete a pointer type.
I recommend you use smart pointers instead of raw pointers with STL
containers.
You can not use auto_ptr with STL containers, but you can use other
common smart pointers like boost::shared_ptr and clone pointers like
copy_ptr and cow_ptr.

http://www.boost.org/libs/smart_ptr/shared_ptr.htm

http://code.axter.com/copy_ptr.h

http://code.axter.com/cow_ptr.h

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