Hi Thomas, On Tue, Nov 1, 2011 at 11:24 PM, Sunil Thomas wrote:

The condensed code that generates the error in the last e-mail is as follows: <snip code> I realize that N defaults to 3 and all, but without making any sweeping changes, is there a way to force MSVC++ 2010 to just compile, considering this was compiling fine with MSVC++ 2008?

Your code (with fairly simple modifications) worked fine for me in VC10 and g++4.X: #include //Added typedef and 'class' keyword below. typedef int some_type; template<typename T = some_type, std::size_t N=3> class my_class { public: my_class(const T& i0) { BOOST_STATIC_ASSERT(N==1); m_data[0]=i0; } private: T m_data[N]; }; I suspect the error you're seeing might depend on how you instantiate my_class -- as Steven said, more context is necessary. If you can post a compilable example that exhibits the problem our advice will likely be more helpful. Nate

Thanks Steve & Nate, What I am building is a library.. not a main application. My main application is in unit test libraries. But building the library itself is generating the error. The class and its implementation is defined entirely in the header, say, cinc.h and I forgot to include a typedef after the class definition: File cinc.h: ---------------------------------------- #include template<class T = int, std::size_t N = 3> class C { public: C() {} C(const T& i0) { BOOST_STATIC_ASSERT(N == 1); m_data[0] = i0; } C(const T& i0, const T& i1) { BOOST_STATIC_ASSERT(N==2); m_data[0] = i0; m_data[1] = i1; } ... ... private: T m_data[N]; }; typedef C<> my_C; Then in a separate class source file, say, cimpl.cpp which includes the header above, the compilation fails with the C2338 error above. The implementation header looks as follows: cimpl.h ---------- #include class C_IMPL { private: my_C m_c; public: C_IMPL(); C_IMPL(my_C& mc); func1(my_C& mc1, ...); func2(my_C& mc2, ...); ... ... }; cimpl.cpp just defines the functions and assumes that all my_C objects are infact based on N=3 definition above.. cimpl.cpp: (snippets) -------------- #include C_IMPL::C_IMPL(): m_c(0,0,0) { } C_IMPL::C_IMPL(my_C& mc): m_c(mc) { } ... ... Yet I get the error as pasted from the MS VC++ 2010, build output window: *ClCompile: some_file1.cpp some_file2.cpp C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(2227): warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(2212) : see declaration of 'std::_Copy_impl' /some_include.hpp(88) : see reference to function template instantiation '_OutIt std::copy(_InIt,_InIt,_OutIt)' being compiled with [ _OutIt=unsigned __int64 *, _InIt=const unsigned __int64 * ] /some_include.hpp(88) : while compiling class template member function 'blah<>::blah(const blah<> &)' /some_include.hpp(71) : see reference to class template instantiation 'blah<>' being compiled cimpl.cpp /cimpl.cpp(442): warning C4100: 'npos' : unreferenced formal parameter C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(2227): warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(2212) : see declaration of 'std::_Copy_impl' /cinc.hpp(108) : see reference to function template instantiation '_OutIt std::copy(_InIt,_InIt,_OutIt)' being compiled with [ _OutIt=unsigned __int64 *, _InIt=const unsigned __int64 * ] /cinc.hpp(108) : while compiling class template member function C<>::C(const C<> &)' /cinc.hpp(45) : see reference to class template instantiation 'C<>' being compiled C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(2801): warning C4996: 'std::_Fill_n': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(2787) : see declaration of 'std::_Fill_n' /cinc.hpp(255) : see reference to function template instantiation 'void std::fill_n::size_type,unsigned __int64>(_OutIt,_Diff,const _Ty &)' being compiled with [ _OutIt=unsigned __int64 *, _Diff=C<>::size_type, _Ty=unsigned __int64 ] /cinc.hpp(255) : while compiling class template member function 'void C<>::assign(const unsigned __int64 &)' /cinc.hpp(83): error C2338: N==1* I don't see myself doing anything different than what Steve did in his main.. and again, why was this building with MSVC++ 2008 (granted, that N defaults to 3 and all)? Anyways, hope this was more helpful. Thanks again, --Thomas. On Wed, Nov 2, 2011 at 9:51 AM, Steven Watanabe wrote:

AMDG

On 11/01/2011 10:24 PM, Sunil Thomas wrote:

...

The condensed code that generates the error in the last e-mail is as follows:

template<typename T = some_type, std::size_t N=3> my_class { public: my_class(const T& i0) { BOOST_STATIC_ASSERT(N==1); m_data[0]=i0; } private: T m_data[N]; }

I realize that N defaults to 3 and all, but without making any sweeping changes, is there a way to force MSVC++ 2010 to just compile, considering this was compiling fine with MSVC++ 2008?

The following code compiles fine with MSVC 2010.

#include <cstddef> #include

template<class T = int, std::size_t N = 3> class C { public: C() {} C(const T& i0) { BOOST_STATIC_ASSERT(N == 1); m_data[0] = i0; } private: T m_data[N]; };

int main() { C<> c; }

Can you provide a minimal *complete* test case that fails?

In Christ, Steven Watanabe _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

Thanks Steven, Didn't mean to snip that out.. I overlooked it as just a warning. So here is the updated code. #include template<class T = int, std::size_t N = 3> class C { public: C() {assign(0)} C(const T& i0) { BOOST_STATIC_ASSERT(N == 1); m_data[0] = i0; } C(const T& i0, const T& i1) { BOOST_STATIC_ASSERT(N==2); m_data[0] = i0; m_data[1] = i1; } const_iterator begin() const {return m_data;} const_iterator end() const {return m_data + N;} void assign(const T& value) {std::fill_n(begin(), size(), value);} static size_t size() {return N;} ... ... private: T m_data[N]; }; typedef C<> my_C; Apologies... but I am unable to see what the MS VC++ 2010 compiler doesn't like about this.. Thanks for pointing this out, --Sunil. On Wed, Nov 2, 2011 at 5:36 PM, Steven Watanabe wrote:

AMDG

On 11/02/2011 04:32 PM, Sunil Thomas wrote:

...

Thanks Steve & Nate,

What I am building is a library.. not a main application. My main application is in unit test libraries. But building the library itself is generating the error. The class and its implementation is defined entirely in the header, say, cinc.h and I forgot to include a typedef after the class definition:

<snip> /cinc.hpp(255) : while compiling class template member function 'void C<>::assign(const unsigned __int64 &)' /cinc.hpp(83): error C2338: N==1*

You've snipped something important. I don't see a definition of assign in your code. Figure out how and why assign is called with 1 argument and that should explain why your code doesn't compile.

...

I don't see myself doing anything different than what Steve did in

his

...

main.. and again, why was this building with MSVC++ 2008 (granted, that N defaults to 3 and all)? Anyways, hope this was more helpful.

In Christ, Steven Watanabe _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users