[Lemon-user] I have a problem using Lp

[NGUYEN Vu Ngoc Tung]

Hello,

I are discovering your library to use in my work. In fact, I need to
understand how Hao-Orlin algorithm works.

When I have tested the lp_demo.cc, g++ doesn't recognize *Lp* as a type in
the library.
I complied with the following command:
g++ -o lp_maxflow_demo lp_maxflow_demo.cc -lemon

And the below lines are errors:
lp_maxflow_demo.cc: In function ‘double maxFlow(const GR&, const CAP&,
typename GR::Node, typename GR::Node)’:
lp_maxflow_demo.cc:34: error: ‘Lp’ was not declared in this scope
lp_maxflow_demo.cc:34: error: expected ‘;’ before ‘lp’
lp_maxflow_demo.cc:37: error: ‘Lp’ cannot appear in a constant-expression
lp_maxflow_demo.cc:37: error: parse error in template argument list
lp_maxflow_demo.cc:38: error: ‘lp’ was not declared in this scope
lp_maxflow_demo.cc:49: error: ‘Lp’ is not a class or namespace
lp_maxflow_demo.cc:49: error: expected ‘;’ before ‘e’
lp_maxflow_demo.cc:50: error: ‘e’ was not declared in this scope
lp_maxflow_demo.cc:51: error: ‘e’ was not declared in this scope
lp_maxflow_demo.cc:52: error: ‘e’ was not declared in this scope
lp_maxflow_demo.cc:56: error: ‘Lp’ is not a class or namespace
lp_maxflow_demo.cc:56: error: expected ‘;’ before ‘o’
lp_maxflow_demo.cc:57: error: ‘o’ was not declared in this scope
lp_maxflow_demo.cc:58: error: ‘o’ was not declared in this scope
lp_maxflow_demo.cc:60: error: ‘o’ was not declared in this scope

Finally, I decided to replace Lp by GlpkLp with #include <lemon/glpk.h>.
With the same compile, I have received the following errors:
/tmp/cc9sYeWZ.o: In function `main':
lp_demo.cc:(.text+0x19): undefined reference to `lemon::GlpkLp::GlpkLp()'
/tmp/cc9sYeWZ.o: In function `lemon::GlpkLp::~GlpkLp()':
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0x22):
undefined reference to `vtable for lemon::GlpkLp'
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0x3a):
undefined reference to `vtable for lemon::GlpkLp'
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0x42):
undefined reference to `vtable for lemon::GlpkLp'
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0x95):
undefined reference to `VTT for lemon::GlpkLp'
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0xac):
undefined reference to `lemon::GlpkBase::~GlpkBase()'
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0xb9):
undefined reference to `VTT for lemon::GlpkLp'
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0xd0):
undefined reference to `lemon::GlpkBase::~GlpkBase()'
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0xdc):
undefined reference to `VTT for lemon::GlpkLp'
lp_demo.cc:(.text._ZN5lemon6GlpkLpD1Ev[lemon::GlpkLp::~GlpkLp()]+0xfc):
undefined reference to `VTT for lemon::GlpkLp'
collect2: ld returned 1 exit status


I am appreciated your help.

Thanks a lot.

-- 
*NGUYEN Vu Ngoc Tung*
PhD Student - Bordeaux 1 University (2010 - 2013)
LaBRI (Laboratoire Bordelais de Recherche en Informatique)
Mobile: (+33) 07 62 71 09 34
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