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// (C) Copyright Gennadiy Rozental 2001.
// 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)
// See http://www.boost.org/libs/test for the library home page.
//
//!@file
//!@brief Collection comparison with enhanced reporting
// ***************************************************************************
#ifndef BOOST_TEST_TOOLS_COLLECTION_COMPARISON_OP_HPP_050815GER
#define BOOST_TEST_TOOLS_COLLECTION_COMPARISON_OP_HPP_050815GER
// Boost.Test
#include <boost/test/tools/assertion.hpp>
#include <boost/test/utils/is_forward_iterable.hpp>
#include <boost/test/utils/is_cstring.hpp>
// Boost
#include <boost/mpl/bool.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/decay.hpp>
#include <boost/test/detail/suppress_warnings.hpp>
//____________________________________________________________________________//
namespace boost {
namespace test_tools {
namespace assertion {
// ************************************************************************** //
// ************* selectors for specialized comparizon routines ************** //
// ************************************************************************** //
template<typename T>
struct specialized_compare : public mpl::false_ {};
#define BOOST_TEST_SPECIALIZED_COLLECTION_COMPARE(Col) \
namespace boost { namespace test_tools { namespace assertion { \
template<> \
struct specialized_compare<Col> : public mpl::true_ {}; \
}}} \
/**/
// ************************************************************************** //
// ************** lexicographic_compare ************** //
// ************************************************************************** //
namespace op {
template <typename OP, bool can_be_equal, bool prefer_shorter,
typename Lhs, typename Rhs>
inline
typename boost::enable_if_c<
unit_test::is_forward_iterable<Lhs>::value && unit_test::is_forward_iterable<Rhs>::value,
assertion_result>::type
lexicographic_compare( Lhs const& lhs, Rhs const& rhs )
{
assertion_result ar( true );
typename Lhs::const_iterator first1 = lhs.begin();
typename Rhs::const_iterator first2 = rhs.begin();
typename Lhs::const_iterator last1 = lhs.end();
typename Rhs::const_iterator last2 = rhs.end();
std::size_t pos = 0;
for( ; (first1 != last1) && (first2 != last2); ++first1, ++first2, ++pos ) {
assertion_result const& element_ar = OP::eval(*first1, *first2);
if( !can_be_equal && element_ar )
return ar; // a < b
assertion_result const& reverse_ar = OP::eval(*first2, *first1);
if( element_ar && !reverse_ar )
return ar; // a<=b and !(b<=a) => a < b => return true
if( element_ar || !reverse_ar )
continue; // (a<=b and b<=a) or (!(a<b) and !(b<a)) => a == b => keep looking
// !(a<=b) and b<=a => b < a => return false
ar = false;
ar.message() << "\nFailure at position " << pos << ": "
<< tt_detail::print_helper(*first1)
<< OP::revert()
<< tt_detail::print_helper(*first2)
<< ". " << element_ar.message();
return ar;
}
if( first1 != last1 ) {
if( prefer_shorter ) {
ar = false;
ar.message() << "\nFirst collection has extra trailing elements.";
}
}
else if( first2 != last2 ) {
if( !prefer_shorter ) {
ar = false;
ar.message() << "\nSecond collection has extra trailing elements.";
}
}
else if( !can_be_equal ) {
ar = false;
ar.message() << "\nCollections appear to be equal.";
}
return ar;
}
template <typename OP, bool can_be_equal, bool prefer_shorter,
typename Lhs, typename Rhs>
inline
typename boost::enable_if_c<
(!unit_test::is_forward_iterable<Lhs>::value && unit_test::is_cstring<Lhs>::value) ||
(!unit_test::is_forward_iterable<Rhs>::value && unit_test::is_cstring<Rhs>::value),
assertion_result>::type
lexicographic_compare( Lhs const& lhs, Rhs const& rhs )
{
typedef typename unit_test::deduce_cstring<Lhs>::type lhs_char_type;
typedef typename unit_test::deduce_cstring<Rhs>::type rhs_char_type;
return lexicographic_compare<OP, can_be_equal, prefer_shorter>(
boost::unit_test::basic_cstring<lhs_char_type>(lhs),
boost::unit_test::basic_cstring<rhs_char_type>(rhs));
}
//____________________________________________________________________________//
// ************************************************************************** //
// ************** equality_compare ************** //
// ************************************************************************** //
template <typename OP, typename Lhs, typename Rhs>
inline
typename boost::enable_if_c<
unit_test::is_forward_iterable<Lhs>::value && unit_test::is_forward_iterable<Rhs>::value,
assertion_result>::type
element_compare( Lhs const& lhs, Rhs const& rhs )
{
assertion_result ar( true );
if( lhs.size() != rhs.size() ) {
ar = false;
ar.message() << "\nCollections size mismatch: " << lhs.size() << " != " << rhs.size();
return ar;
}
typename Lhs::const_iterator left = lhs.begin();
typename Rhs::const_iterator right = rhs.begin();
std::size_t pos = 0;
for( ; pos < lhs.size(); ++left, ++right, ++pos ) {
assertion_result const element_ar = OP::eval( *left, *right );
if( element_ar )
continue;
ar = false;
ar.message() << "\nMismatch at position " << pos << ": "
<< tt_detail::print_helper(*left)
<< OP::revert()
<< tt_detail::print_helper(*right)
<< ". " << element_ar.message();
}
return ar;
}
// In case string comparison is branching here
template <typename OP, typename Lhs, typename Rhs>
inline
typename boost::enable_if_c<
(!unit_test::is_forward_iterable<Lhs>::value && unit_test::is_cstring<Lhs>::value) ||
(!unit_test::is_forward_iterable<Rhs>::value && unit_test::is_cstring<Rhs>::value),
assertion_result>::type
element_compare( Lhs const& lhs, Rhs const& rhs )
{
typedef typename unit_test::deduce_cstring<Lhs>::type lhs_char_type;
typedef typename unit_test::deduce_cstring<Rhs>::type rhs_char_type;
return element_compare<OP>(boost::unit_test::basic_cstring<lhs_char_type>(lhs),
boost::unit_test::basic_cstring<rhs_char_type>(rhs));
}
//____________________________________________________________________________//
// ************************************************************************** //
// ************** non_equality_compare ************** //
// ************************************************************************** //
template <typename OP, typename Lhs, typename Rhs>
inline assertion_result
non_equality_compare( Lhs const& lhs, Rhs const& rhs )
{
assertion_result ar( true );
if( lhs.size() != rhs.size() )
return ar;
typename Lhs::const_iterator left = lhs.begin();
typename Rhs::const_iterator right = rhs.begin();
typename Lhs::const_iterator end = lhs.end();
for( ; left != end; ++left, ++right ) {
if( OP::eval( *left, *right ) )
return ar;
}
ar = false;
ar.message() << "\nCollections appear to be equal";
return ar;
}
//____________________________________________________________________________//
// ************************************************************************** //
// ************** cctraits ************** //
// ************************************************************************** //
// set of collection comparison traits per comparison OP
template<typename OP>
struct cctraits;
template<typename Lhs, typename Rhs>
struct cctraits<op::EQ<Lhs, Rhs> > {
typedef specialized_compare<Lhs> is_specialized;
};
template<typename Lhs, typename Rhs>
struct cctraits<op::NE<Lhs, Rhs> > {
typedef specialized_compare<Lhs> is_specialized;
};
template<typename Lhs, typename Rhs>
struct cctraits<op::LT<Lhs, Rhs> > {
static const bool can_be_equal = false;
static const bool prefer_short = true;
typedef specialized_compare<Lhs> is_specialized;
};
template<typename Lhs, typename Rhs>
struct cctraits<op::LE<Lhs, Rhs> > {
static const bool can_be_equal = true;
static const bool prefer_short = true;
typedef specialized_compare<Lhs> is_specialized;
};
template<typename Lhs, typename Rhs>
struct cctraits<op::GT<Lhs, Rhs> > {
static const bool can_be_equal = false;
static const bool prefer_short = false;
typedef specialized_compare<Lhs> is_specialized;
};
template<typename Lhs, typename Rhs>
struct cctraits<op::GE<Lhs, Rhs> > {
static const bool can_be_equal = true;
static const bool prefer_short = false;
typedef specialized_compare<Lhs> is_specialized;
};
// ************************************************************************** //
// ************** compare_collections ************** //
// ************************************************************************** //
// Overloaded set of functions dispatching to specific implementation of comparison
template <typename Lhs, typename Rhs, typename L, typename R>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<op::EQ<L, R> >*, mpl::true_ )
{
return assertion::op::element_compare<op::EQ<L, R> >( lhs, rhs );
}
//____________________________________________________________________________//
template <typename Lhs, typename Rhs, typename L, typename R>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<op::EQ<L, R> >*, mpl::false_ )
{
return lhs == rhs;
}
//____________________________________________________________________________//
template <typename Lhs, typename Rhs, typename L, typename R>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<op::NE<L, R> >*, mpl::true_ )
{
return assertion::op::non_equality_compare<op::NE<L, R> >( lhs, rhs );
}
//____________________________________________________________________________//
template <typename Lhs, typename Rhs, typename L, typename R>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<op::NE<L, R> >*, mpl::false_ )
{
return lhs != rhs;
}
//____________________________________________________________________________//
template <typename OP, typename Lhs, typename Rhs>
inline assertion_result
lexicographic_compare( Lhs const& lhs, Rhs const& rhs )
{
return assertion::op::lexicographic_compare<OP, cctraits<OP>::can_be_equal, cctraits<OP>::prefer_short>( lhs, rhs );
}
//____________________________________________________________________________//
template <typename Lhs, typename Rhs, typename OP>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<OP>*, mpl::true_ )
{
return lexicographic_compare<OP>( lhs, rhs );
}
//____________________________________________________________________________//
template <typename Lhs, typename Rhs, typename L, typename R>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<op::LT<L, R> >*, mpl::false_ )
{
return lhs < rhs;
}
//____________________________________________________________________________//
template <typename Lhs, typename Rhs, typename L, typename R>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<op::LE<L, R> >*, mpl::false_ )
{
return lhs <= rhs;
}
//____________________________________________________________________________//
template <typename Lhs, typename Rhs, typename L, typename R>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<op::GT<L, R> >*, mpl::false_ )
{
return lhs > rhs;
}
//____________________________________________________________________________//
template <typename Lhs, typename Rhs, typename L, typename R>
inline assertion_result
compare_collections( Lhs const& lhs, Rhs const& rhs, boost::type<op::GE<L, R> >*, mpl::false_ )
{
return lhs >= rhs;
}
//____________________________________________________________________________//
// ************************************************************************** //
// ********* specialization of comparison operators for collections ********* //
// ************************************************************************** //
#define DEFINE_COLLECTION_COMPARISON( oper, name, rev ) \
template<typename Lhs,typename Rhs> \
struct name<Lhs,Rhs,typename boost::enable_if_c< \
unit_test::is_forward_iterable<Lhs>::value \
&& !unit_test::is_cstring<Lhs>::value \
&& unit_test::is_forward_iterable<Rhs>::value \
&& !unit_test::is_cstring<Rhs>::value>::type> { \
public: \
typedef assertion_result result_type; \
\
typedef name<Lhs, Rhs> OP; \
typedef typename \
mpl::if_c<is_same<typename decay<Lhs>::type, \
typename decay<Rhs>::type>::value, \
typename cctraits<OP>::is_specialized, \
mpl::false_>::type is_specialized; \
\
typedef name<typename Lhs::value_type, \
typename Rhs::value_type> elem_op; \
\
static assertion_result \
eval( Lhs const& lhs, Rhs const& rhs) \
{ \
return assertion::op::compare_collections( lhs, rhs, \
(boost::type<elem_op>*)0, \
is_specialized() ); \
} \
\
template<typename PrevExprType> \
static void \
report( std::ostream&, \
PrevExprType const&, \
Rhs const& ) {} \
\
static char const* revert() \
{ return " " #rev " "; } \
\
}; \
/**/
BOOST_TEST_FOR_EACH_COMP_OP( DEFINE_COLLECTION_COMPARISON )
#undef DEFINE_COLLECTION_COMPARISON
//____________________________________________________________________________//
} // namespace op
} // namespace assertion
} // namespace test_tools
} // namespace boost
#include <boost/test/detail/enable_warnings.hpp>
#endif // BOOST_TEST_TOOLS_COLLECTION_COMPARISON_OP_HPP_050815GER
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