Link error: LNK 2001 unresolved symbol

[PCuong1983]

Sorry all about pre-my post Here is my source code: http://www.in4site.com/hms.txt When i run compiler i got this error Error 1 error LNK2001: unresolved external symbol "private: static class std::list > * Hotel::_rooms" (?_rooms@Hotel@@0PAV?$list@VRoom@@V?$allocator@VRoom@@@std@@@std@@A) HSM.obj Error 2 fatal error LNK1120: 1 unresolved externals C:\Users\Google\Documents\Visual Studio 2005\Projects\HMSv10\Debug\HMSv10.exe i have looked up LNK2001 error code on MSDN website but no solution for this situation. Can any1 help me solve it ? but when i use vs 2005 to compile i got LNK2001 error, but when i use vs 2008 to compile , i got no error, this program run normally ? i dont know why ? can any1 answer this ? thanks in advance

[toxcct]

Member 2428381 wrote:

have looked up LNK2001 error code on MSDN website but no solution for this situation

I don't know what you saw there, and what you tried to fix that out, but :

unresolved external symbol "private: static class std::list > * Hotel::_rooms"

means that the compiler knows the definition of your class (in its .h file most probably), but the implementation is not foundin the directoried the linker is searching into. do you have the implementation file somewhere else ? is it an external library ? if so, you certainly missed to had its path in the linker settings of your project...

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[Cedric Moonen]

Looking at the code you posted earlier, Hotel::_rooms is a std::list (I don't know a list of what because the < and > symbols were treated as html tags and disappeared). I'm not sure, but it looks like it is a pointer also. Is that what you want instead of just having a list object ? Anyway, as I asked in my previous post, static variables need to be defined in a cpp file. Do you have something like this:

std::list<...;>* Hotel::_rooms = NULL;

in your cpp file ?

Cédric Moonen Software developer
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[PCuong1983]

Hi, I just combinated all code into once file as you saw at http://www.in4iste.com/hms.txt But when i use vs 2005 to compile i got LNK2001 error and when i use vs 2008 to compile , i got no error, this program run normally. im a new in c++, please help!

[PCuong1983]

Yeah, the full code of that: std::list Hotel::_rooms = NULL; but when i put that line into my cpp file, i got "Project : error PRJ0002 : Error result 31 returned from 'c:\Program Files\Microsoft Visual Studio 8\VC\bin\mt.exe" I have used the "No (/INCREMENTAL:NO)" link option to solved this error Thanks You!