C++ in Visual Studio 2013 - <Class> is undefined - c++

Question

I'm very new to C++/VS and might missing something in the code/configuration of my project.
In my solution I have 2 projects:
first is NTL which I downloaded from https://bitbucket.org/ben_key/ntl, and compiled to a static library NTL.lib.
a 'test' project in which: (1) I added the header files by specifying their directory in the properties->C++->Additional Include Files, (2) in the properties->Linker->Input->Additional Dependencies I added "NTL.lib" (3)copied the NTL.lib file to be in the same directory as the main cpp file of the 'test' project.
My cpp only contains:
#include <NTL/GF2X.h>
int main() {
GF2X P;
return 1;
}
The build gives the output:
1>------ Build started: Project: test, Configuration: Release Win32 ------
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.CppBuild.targets(388,5): warning MSB8028: The intermediate directory (Release\) contains files shared from another project (ntl-test.vcxproj). This can lead to incorrect clean and rebuild behavior.
1> QuickTest.cpp
1>..\tests\QuickTest.cpp(43): warning C4101: 'n' : unreferenced local variable
1>D:\studies\Thesis\NTL-Ben-Key\Include\NTL/vector.h(79): warning C4291: 'void *operator new(size_t,_ntl_vector_placement)' : no matching operator delete found; memory will not be freed if initialization throws an exception
1> D:\studies\Thesis\NTL-Ben-Key\Include\NTL/vector.h(36) : see declaration of 'operator new'
1> D:\studies\Thesis\NTL-Ben-Key\Include\NTL/vector.h(319) : see reference to function template instantiation 'void NTL::BlockConstruct<T>(T *,long)' being compiled
1> with
1> [
1> T=NTL::zz_p
1> ]
1> D:\studies\Thesis\NTL-Ben-Key\Include\NTL/vector.h(291) : while compiling class template member function 'void NTL::Vec<NTL::zz_p>::DoSetLength(long)'
1> D:\studies\Thesis\NTL-Ben-Key\Include\NTL/vector.h(115) : see reference to function template instantiation 'void NTL::Vec<NTL::zz_p>::DoSetLength(long)' being compiled
1> D:\studies\Thesis\NTL-Ben-Key\Include\NTL/vec_lzz_p.h(14) : see reference to class template instantiation 'NTL::Vec<NTL::zz_p>' being compiled
1> MyTest.cpp
1>MyTest.cpp(4): error C2065: 'GF2X' : undeclared identifier
1>MyTest.cpp(4): error C2146: syntax error : missing ';' before identifier 'P'
1>MyTest.cpp(4): error C2065: 'P' : undeclared identifier
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
It is really a simple thing and I didn't figured out what I'm missing.

Answer 1

From NTL/include/NTL/ tools.h:
#define NTL_NAMESPACE NTL
#define NTL_OPEN_NNS namespace NTL_NAMESPACE {
#define NTL_CLOSE_NNS }
So when the preprocessor encounters NTL_OPEN_NNS, as is the case in the include file GF2X.h, it expands it to namespace NTL meaning the GF2X class is declared insided the namespace NTL. In order to use it you need to fully qualify it as NTL::GF2X or use using namespace NTL for discussion about which one look here for example.
Likewise at the end of GF2X.h there is a closing bracket after expanding NTL_CLOSE_NNS