[Boost-bugs] [Boost C++ Libraries] #10127: coordinate_matrix sort() fails on to std::swap

Subject: [Boost-bugs] [Boost C++ Libraries] #10127: coordinate_matrix sort() fails on to std::swap
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-06-16 08:56:57

#10127: coordinate_matrix sort() fails on to std::swap
-----------------------+------------------------------
 Reporter:  anonymous  |       Type:  Bugs
   Status:  new        |  Milestone:  To Be Determined
Component:  None       |    Version:  Boost 1.54.0
 Severity:  Problem    |   Keywords:
-----------------------+------------------------------
 Orginally posted here:

 http://stackoverflow.com/questions/24228772/c11-compatibility-of-sparse-

 matrix-implementations

 The following program does not compile with gcc 4.8 or clang 3.4 when
 --std=c++11 is set:

 {{{
 #include <boost/numeric/ublas/io.hpp>
 #include <boost/numeric/ublas/matrix_sparse.hpp>

 using namespace boost::numeric::ublas;

 int main(int argc, char** argv) {
   coordinate_matrix<int> m1(100, 100, 100);

   for (int i = 0; i < 100; i++)
     m1.insert_element(i,i,i);

   compressed_matrix<int> m2(m1, 100);
 }
 }}}

 We can solve the issue by providing a swap() routine:

 {{{
 #include <boost/numeric/ublas/io.hpp>
 #include <boost/numeric/ublas/matrix_sparse.hpp>

 using namespace boost::numeric::ublas;

 namespace std {
     template<class M>
     inline
     void swap (boost::numeric::ublas::index_triple<M> i1,
 boost::numeric::ublas::index_triple<M> i2) {
         i1.swap (i2);
     }
 }


 int main(int argc, char** argv) {
   coordinate_matrix<int> m1(100, 100, 100);

   for (int i = 0; i < 100; i++)
     m1.insert_element(i,i,i);

   compressed_matrix<int> m2(m1, 100);
 }
 }}}

 I am not an expert C++ template programmer, so I am unable to decide what
 is the cause here, but the C++ reference on std::sort explicitly mentions
 a swap() method.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10127>
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