C++ - issue while porting C++ code from Visual Studio to Linux Eclipse IDE -

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i have project build in microsoft visual studio , want port in linux(opensuse 12.2) using eclipse ide.

the project using opencv , have managed build opencv in linux. not huge, contains 3 .cpp files , 4 .h files defines classes used in project , 1 of .cpp files contains main() function.

however, there 1 additional instances.inc file following content:

#include "graph.h"  #ifdef _msc_ver #pragma warning(disable: 4661) #endif  // instantiations: <captype, tcaptype, flowtype> // important: //    flowtype should 'larger' tcaptype //    tcaptype should 'larger' captype  template class graph<int,int,int>; template class graph<short,int,int>; template class graph<float,float,float>; template class graph<double,double,double>;

where graph.h contains declaration of graph class.

i changed extension of instances.inc file instances.h file. however, when try build project receive following error:

../src/branchandmincut.cpp:246: undefined reference `graph<int, int, int>::maxflow(bool, block<int>*)'

which guess related .inc file. know how solve problem?

edit:

i want mention instanes.inc files included @ end of graph.cpp file.

you using instantiating of template classes. first thing may delete .cpp-file contains realization of template class graph , put implementation of methods , etc in graph.h file - action make instantiating unnecessary. next thing can try rename instances.h/inc instances.cpp , compile (place in makefile or use).

i've found links:

http://www.cplusplus.com/forum/articles/10627/

http://www.cplusplus.com/forum/articles/14272/

class template instantiation

why can templates implemented in header file?


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