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Ublas : |
Subject: Re: [ublas] Linking error using "<<=" (assignment.hpp)
From: Nasos Iliopoulos (nasos_i_at_[hidden])
Date: 2011-11-16 13:04:20
Yan,
this is a known issue and a patch has been already uploaded. Please take
a look at this discussion:
http://lists.boost.org/MailArchives/ublas/2011/10/5059.php
In sort:
all the non-template functions need to be inlined , i.e. in the
assignment.hpp change:
BOOST_UBLAS_INLINE to just inline
and also add the inline directive in front of the by_row_xxx and
by_column_xxx polices, i.e.
by_row_policy<wrap> by_row_wrap() {
should turn into:
inline by_row_policy<wrap> by_row_wrap() { return
alterntatively to all those apply the patch in the post I linked.
I hope the patch (that is already in the boost trac) will be merged soon.
Best,
Nasos
by_row_policy<wrap>(); }
On 11/16/2011 12:59 PM, Bombardier, Yan wrote:
>
> Hi,
>
> I am new to ublas and I am trying to initialize a matrix or a vector
> within the code itself, e.g. M=[1,2,3;4,5,6;7,8,9] in Matlab. I found
> many ways of addressing this, including the "storage_adaptor" method
> provided on http://www.guwi17.de/ublas/examples/. This approach works
> well, but as far as I understood, you need to create a C array first
> and I was looking for a more straightforward way to initialize my
> vectors/matrices.
>
> I found another approach, consisting of using the assignment operator
> "<<=", e.g. M<<=1,2,3,4,5,6,7,8,9, given that the vector or matrix is
> properly declared with its dimensions. Using this approach, a user can
> directly populate the vector or matrix without a C array (this is what
> I was looking for...!). This approach works if the code is written in
> the main file (e.g.
> http://svn.boost.org/svn/boost/branches/release/libs/numeric/ublas/test/test_assignment.cpp),
> but I came across linking error with MSVC 10 when I use the assignment
> operator in different cpp/h files. I attached my test case (main.cpp;
> a.h, a.cpp).
>
> I get the following errors when I compile this code using MSVC 10:
>
> 1>------ Build started: Project: TEST, Configuration: Debug Win32 ------
>
> 1>Build started 11/16/2011 11:47:08.
>
> 1>InitializeBuildStatus:
>
> 1> Creating "Debug\TEST.unsuccessfulbuild" because "AlwaysCreate" was
> specified.
>
> 1>ClCompile:
>
> 1> main.cpp
>
> 1> a.cpp
>
> 1> Generating Code...
>
> 1>ManifestResourceCompile:
>
> 1> All outputs are up-to-date.
>
> 1>main.obj : error LNK2005: "class boost::numeric::ublas::begin1_manip
> __cdecl boost::numeric::ublas::begin1(void)"
> (?begin1_at_ublas@numeric_at_boost@@YA?AVbegin1_manip_at_123@XZ) already
> defined in a.obj
>
> 1>main.obj : error LNK2005: "class boost::numeric::ublas::begin2_manip
> __cdecl boost::numeric::ublas::begin2(void)"
> (?begin2_at_ublas@numeric_at_boost@@YA?AVbegin2_manip_at_123@XZ) already
> defined in a.obj
>
> 1>main.obj : error LNK2005: "class
> boost::numeric::ublas::next_row_manip __cdecl
> boost::numeric::ublas::next_row(void)"
> (?next_row_at_ublas@numeric_at_boost@@YA?AVnext_row_manip_at_123@XZ) already
> defined in a.obj
>
> 1>main.obj : error LNK2005: "class
> boost::numeric::ublas::next_column_manip __cdecl
> boost::numeric::ublas::next_column(void)"
> (?next_column_at_ublas@numeric_at_boost@@YA?AVnext_column_manip_at_123@XZ)
> already defined in a.obj
>
> 1>main.obj : error LNK2005: "class
> boost::numeric::ublas::traverse_policy::by_row_policy<struct
> boost::numeric::ublas::traverse_policy::wrap> __cdecl
> boost::numeric::ublas::traverse_policy::by_row(void)"
> (?by_row_at_traverse_policy_at_ublas@numeric_at_boost@@YA?AV?$by_row_policy_at_Uwrap@traverse_policy_at_ublas@numeric_at_boost@@@1234_at_XZ)
> already defined in a.obj
>
> 1>main.obj : error LNK2005: "class
> boost::numeric::ublas::traverse_policy::by_row_policy<struct
> boost::numeric::ublas::traverse_policy::wrap> __cdecl
> boost::numeric::ublas::traverse_policy::by_row_wrap(void)"
> (?by_row_wrap_at_traverse_policy_at_ublas@numeric_at_boost@@YA?AV?$by_row_policy_at_Uwrap@traverse_policy_at_ublas@numeric_at_boost@@@1234_at_XZ)
> already defined in a.obj
>
> 1>main.obj : error LNK2005: "class
> boost::numeric::ublas::traverse_policy::by_row_policy<struct
> boost::numeric::ublas::traverse_policy::no_wrap> __cdecl
> boost::numeric::ublas::traverse_policy::by_row_no_wrap(void)"
> (?by_row_no_wrap_at_traverse_policy_at_ublas@numeric_at_boost@@YA?AV?$by_row_policy_at_Uno_wrap_at_traverse_policy_at_ublas@numeric_at_boost@@@1234_at_XZ)
> already defined in a.obj
>
> 1>main.obj : error LNK2005: "class
> boost::numeric::ublas::traverse_policy::by_column_policy<struct
> boost::numeric::ublas::traverse_policy::wrap> __cdecl
> boost::numeric::ublas::traverse_policy::by_column(void)"
> (?by_column_at_traverse_policy_at_ublas@numeric_at_boost@@YA?AV?$by_column_policy_at_Uwrap@traverse_policy_at_ublas@numeric_at_boost@@@1234_at_XZ)
> already defined in a.obj
>
> 1>main.obj : error LNK2005: "class
> boost::numeric::ublas::traverse_policy::by_column_policy<struct
> boost::numeric::ublas::traverse_policy::wrap> __cdecl
> boost::numeric::ublas::traverse_policy::by_column_wrap(void)"
> (?by_column_wrap_at_traverse_policy_at_ublas@numeric_at_boost@@YA?AV?$by_column_policy_at_Uwrap@traverse_policy_at_ublas@numeric_at_boost@@@1234_at_XZ)
> already defined in a.obj
>
> 1>main.obj : error LNK2005: "class
> boost::numeric::ublas::traverse_policy::by_column_policy<struct
> boost::numeric::ublas::traverse_policy::no_wrap> __cdecl
> boost::numeric::ublas::traverse_policy::by_column_no_wrap(void)"
> (?by_column_no_wrap_at_traverse_policy_at_ublas@numeric_at_boost@@YA?AV?$by_column_policy_at_Uno_wrap_at_traverse_policy_at_ublas@numeric_at_boost@@@1234_at_XZ)
> already defined in a.obj
>
> 1>C:\Users\XXXXX\Desktop\TEST\Debug\TEST.exe : fatal error LNK1169:
> one or more multiply defined symbols found
>
> 1>
>
> 1>Build FAILED.
>
> 1>
>
> 1>Time Elapsed 00:00:04.06
>
> ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped
> ==========
>
> I am not the first one to report such error:
> https://svn.boost.org/trac/boost/ticket/6010 (reported 5 weeks ago)
>
> The linking problem was addressed by adding "inline" for the
> problematic functions. This fix was however not included in Boost 1.48.
>
> Now, here are my questions:
>
> 1.Am I using the "<<=" correctly?
>
> 2.Is there a reason why this fix was not implemented in 1.48?
>
> 3.Is there another (less intrusive) fix?
>
> 4.Is there a better way to initialize a ublas vector/matrix?
>
> Thank you,
>
> Yan
>
>
>
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