VC.STL Newsgroup Good Questions(二)

VC.STL Newsgroup Good Questions(二)

    使用Templated Member Function时C2664编译错误，Why?

Article last modified on 2002-5-29

----------------------------------------------------------------

The information in this article applies to:

-        Microsoft Visual C++, 32-bit Editions, version 6.0, SP5

----------------------------------------------------------------

 

Question:

下面的代码编译时报告C2664错误： Error C2664: '__thiscall std::list >::std::list >(unsigned int,const int &,const class std::allocator &)' : cannot convert parameter 1 from 'class std::istream_iterator > (__cdecl *)(void)' to 'unsigned int'         This conversion requires a reinterpret_cast, a C-style cast or function-style cast 代码如下： istream_iterator intFileBegin(); istream_iterator intFileEnd; list intList(intFileBegin, intFileEnd);

 

Answer:

当VC6的库文件刚发布的时候，编译器还不支持Templated Member Function。这样，Templated List Constructor无法得到Non-List Iterators。 现在编译器虽然支持Templated Member Function，但要想编译通过，你还是需要一个新的标准库。前面的代码应该在以下环境中可以编译通过： n        VC 7 n        VC6 with Dinkumware library upgrade n        VC6 with STLport   如果你没有这样的编译环境，那还是不要使用Templated Member Function。你可以这么做： istream_iterator intFileBegin(cin); istream_iterator intFileEnd; list intList; copy(intFileBegin,intFileEnd,back_inserter(intList));   这样同样可以把istream中的东西导入到list中。

 

(To be Continued)

 

Written by zhengyun@tomosoft.com

Trackback: http://tb.blog.youkuaiyun.com/TrackBack.aspx?PostId=12674