VC. STL Newsgroup Good Questions (2)

VC. STL Newsgroup Good Questions (2)

When Templated Member Function is used, the C2664 compilation error occurs. Why?

Article last modified on 2002-5-29

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The information in this article applies:

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

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Question:

The following code reports C2664 errors during compilation: 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 The Code is as follows: Istream_iterator IntFileBegin (); Istream_iterator IntFileEnd; List IntList (intFileBegin, intFileEnd );

 

Answer:

When the vc6 library file is released, the compiler does not support the templated member function. In this way, the templated list constructor cannot obtain non-list iterators. Although the compiler supports the templated member function, you still need a new standard library to compile the function. The previous code should be compiled in the following environment: N vc 7 N vc6 with dinkumware library upgrade N vc6 with stlport   If you do not have such a compiling environment, do not useTemplated member function. You can do this: Istream_iterator Intfilebegin (CIN ); Istream_iterator Intfileend; List IntList; Copy (intfilebegin, intfileend, back_inserter (intlist ));   In this way, you can import the items in istream to the list.

 

(To be Continued)

 

Written by zhengyun@tomosoft.com

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