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//
// Copyright (c) 2000-2002
// Joerg Walter, Mathias Koch
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// The authors gratefully acknowledge the support of
// GeNeSys mbH & Co. KG in producing this work.
//
#ifndef _BOOST_UBLAS_DEFINITIONS_
#define _BOOST_UBLAS_DEFINITIONS_
namespace boost { namespace numeric { namespace ublas {
namespace detail {
/* Borrowed from boost/concept_checks.hpp
"inline" is used for ignore_unused_variable_warning()
to make sure there is no overhead with g++.
*/
template <class T> inline
void ignore_unused_variable_warning(const T&) {}
} // namespace detail
// Borrowed from Dave Abraham's noncopyable.
// I believe this should be part of utility.hpp one day...
namespace nonassignable_ // protection from unintended ADL
{
class nonassignable {
protected:
nonassignable () {}
~nonassignable () {}
private: // emphasize the following members are private
const nonassignable& operator= (const nonassignable &);
}; // nonassignable
}
typedef nonassignable_::nonassignable nonassignable;
// Assignment proxy.
// Provides temporary free assigment when LHS has no alias on RHS
template<class C>
class noalias_proxy:
private nonassignable {
public:
typedef typename C::closure_type closure_type;
BOOST_UBLAS_INLINE
noalias_proxy (C& lval):
nonassignable (), lval_ (lval) {}
BOOST_UBLAS_INLINE
noalias_proxy (const noalias_proxy& p):
nonassignable (), lval_ (p.lval_) {}
template <class E>
BOOST_UBLAS_INLINE
closure_type &operator= (const E& e) {
lval_.assign (e);
return lval_;
}
template <class E>
BOOST_UBLAS_INLINE
closure_type &operator+= (const E& e) {
lval_.plus_assign (e);
return lval_;
}
template <class E>
BOOST_UBLAS_INLINE
closure_type &operator-= (const E& e) {
lval_.minus_assign (e);
return lval_;
}
private:
closure_type lval_;
};
// Improve syntax of efficient assignment where no aliases of LHS appear on the RHS
// noalias(lhs) = rhs_expression
template <class C>
BOOST_UBLAS_INLINE
noalias_proxy<C> noalias (C& lvalue) {
return noalias_proxy<C> (lvalue);
}
template <class C>
BOOST_UBLAS_INLINE
noalias_proxy<const C> noalias (const C& lvalue) {
return noalias_proxy<const C> (lvalue);
}
// Possible future compatible syntax where lvalue possible has an unsafe alias on the RHS
// safe(lhs) = rhs_expression
template <class C>
BOOST_UBLAS_INLINE
C& safe (C& lvalue) {
return lvalue;
}
template <class C>
BOOST_UBLAS_INLINE
const C& safe (const C& lvalue) {
return lvalue;
}
// Dimension accessors
namespace dimension {
// Generic accessors
template<unsigned dimension>
struct dimension_properties {};
template<>
struct dimension_properties<1> {
template <class E>
BOOST_UBLAS_INLINE static
typename E::size_type size (const vector_expression<E> &e) {
return e ().size ();
}
template <class E>
BOOST_UBLAS_INLINE static
typename E::size_type size (const matrix_expression<E> &e) {
return e ().size1 ();
}
// Note: Index functions cannot deduce dependant template parameter V or M from i
template <class V>
BOOST_UBLAS_INLINE static
typename V::size_type index (const typename V::iterator &i) {
return i.index ();
}
template <class M>
BOOST_UBLAS_INLINE static
typename M::size_type index (const typename M::iterator1 &i) {
return i.index1 ();
}
template <class M>
BOOST_UBLAS_INLINE static
typename M::size_type index (const typename M::iterator2 &i) {
return i.index1 ();
}
};
template<>
struct dimension_properties<2> {
template <class E>
BOOST_UBLAS_INLINE static
typename E::size_type size (const vector_expression<E> &) {
return 1;
}
template <class E>
BOOST_UBLAS_INLINE static
typename E::size_type size (const matrix_expression<E> &e) {
return e ().size2 ();
}
template <class V>
BOOST_UBLAS_INLINE static
typename V::size_type index (const typename V::iterator &) {
return 1;
}
template <class M>
BOOST_UBLAS_INLINE static
typename M::size_type index (const typename M::iterator1 &i) {
return i.index2 ();
}
template <class M>
BOOST_UBLAS_INLINE static
typename M::size_type index (const typename M::iterator2 &i) {
return i.index2 ();
}
};
template<unsigned dimension, class E>
BOOST_UBLAS_INLINE
typename E::size_type size (const E& e) {
return dimension_properties<dimension>::size (e);
}
template<unsigned dimension, class I>
BOOST_UBLAS_INLINE
typename I::container_type::size_type
index (const I& i) {
typedef typename I::container_type container_type;
return dimension_properties<dimension>::template index<container_type> (i);
}
// Named accessors - just syntactic sugar
template<class V>
typename V::size_type num_elements (const V &v) {
return v.size ();
}
template<class M>
typename M::size_type num_rows (const M &m) {
return m.size1 ();
}
template<class M>
typename M::size_type num_columns (const M &m) {
return m.size2 ();
}
template<class MV>
typename MV::size_type num_non_zeros (const MV &mv) {
return mv.non_zeros ();
}
}
}}}
#endif
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