id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
1915	Nested matrix products with transposes causes compiler to complain error: invalid application of ‘sizeof’	Leo Singer <aronnax@…>	Gunter	"When using ublas, a pair of nested products will cause the compiler to complain if there is a `trans` on any of the operands.  For example:

{{{
#!cpp
using namespace boost::numeric::ublas;
matrix<float> A(3,3),	B(3,3),	C(3,3);

prod(prod(A,B),trans(C));  // fails
prod(prod(trans(A),B),C);  // fails
prod(prod(A,trans(B)),C);  // fails
prod(prod(A,B),C);  // OK
}}}

The compiler produces the following error message:
{{{
/opt/local/include/boost/numeric/ublas/matrix_expression.hpp: In function ‘typename boost::numeric::ublas::matrix_matrix_binary_traits<typename E1::value_type, E1, typename E2::value_type, E2>::result_type boost::numeric::ublas::prod(const boost::numeric::ublas::matrix_expression<E>&, const boost::numeric::ublas::matrix_expression<E2>&) [with E1 = boost::numeric::ublas::matrix_matrix_binary<boost::numeric::ublas::matrix<float, boost::numeric::ublas::basic_row_major<size_t, ptrdiff_t>, boost::numeric::ublas::unbounded_array<float, std::allocator<float> > >, boost::numeric::ublas::matrix<float, boost::numeric::ublas::basic_row_major<size_t, ptrdiff_t>, boost::numeric::ublas::unbounded_array<float, std::allocator<float> > >, boost::numeric::ublas::matrix_matrix_prod<float, float, float> >, E2 = boost::numeric::ublas::matrix_unary2<boost::numeric::ublas::matrix<float, boost::numeric::ublas::basic_row_major<size_t, ptrdiff_t>, boost::numeric::ublas::unbounded_array<float, std::allocator<float> > >, boost::numeric::ublas::scalar_identity<float> >]’:
bad_multiply.cpp:9:   instantiated from here
/opt/local/include/boost/numeric/ublas/matrix_expression.hpp:4815: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ 
}}}"	Support Requests	assigned	To Be Determined	uBLAS	Boost 1.34.1	Cosmetic		ublas trans nested product