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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
//! Bitwise comparison manipulator implementation
// ***************************************************************************
#ifndef BOOST_TEST_TOOLS_DETAIL_BITWISE_MANIP_HPP_012705GER
#define BOOST_TEST_TOOLS_DETAIL_BITWISE_MANIP_HPP_012705GER
// Boost Test
#include <boost/test/tools/detail/fwd.hpp>
#include <boost/test/tools/detail/indirections.hpp>
#include <boost/test/tools/assertion_result.hpp>
#include <boost/test/tools/assertion.hpp>
// STL
#include <climits> // for CHAR_BIT
#include <boost/test/detail/suppress_warnings.hpp>
//____________________________________________________________________________//
namespace boost {
namespace test_tools {
// ************************************************************************** //
// ************** bitwise comparison manipulator ************** //
// ************************************************************************** //
//! Bitwise comparison manipulator
struct bitwise {};
//____________________________________________________________________________//
inline int
operator<<( unit_test::lazy_ostream const&, bitwise ) { return 0; }
//____________________________________________________________________________//
namespace tt_detail {
/*!@brief Bitwise comparison of two operands
*
* This class constructs an @ref assertion_result that contains precise bit comparison information.
* In particular the location of the mismatches (if any) are printed in the assertion result.
*/
template<typename Lhs, typename Rhs, typename E>
inline assertion_result
bitwise_compare(Lhs const& lhs, Rhs const& rhs, E const& expr )
{
assertion_result pr( true );
std::size_t left_bit_size = sizeof(Lhs)*CHAR_BIT;
std::size_t right_bit_size = sizeof(Rhs)*CHAR_BIT;
static Lhs const leftOne( 1 );
static Rhs const rightOne( 1 );
std::size_t total_bits = left_bit_size < right_bit_size ? left_bit_size : right_bit_size;
for( std::size_t counter = 0; counter < total_bits; ++counter ) {
if( (lhs & ( leftOne << counter )) != (rhs & (rightOne << counter)) ) {
if( pr ) {
pr.message() << " [";
expr.report( pr.message().stream() );
pr.message() << "]. Bitwise comparison failed";
pr = false;
}
pr.message() << "\nMismatch at position " << counter;
}
}
if( left_bit_size != right_bit_size ) {
if( pr ) {
pr.message() << " [";
expr.report( pr.message().stream() );
pr.message() << "]. Bitwise comparison failed";
pr = false;
}
pr.message() << "\nOperands bit sizes mismatch: " << left_bit_size << " != " << right_bit_size;
}
return pr;
}
//____________________________________________________________________________//
//! Returns an assertion_result using the bitwise comparison out of an expression
//!
//! This is used as a modifer of the normal operator<< on expressions to use the
//! bitwise comparison.
//!
//! @note Available only for compilers supporting the @c auto declaration.
template<typename T1, typename T2, typename T3, typename T4>
inline assertion_result
operator<<(assertion_evaluate_t<assertion::binary_expr<T1,T2,assertion::op::EQ<T3,T4> > > const& ae, bitwise )
{
return bitwise_compare( ae.m_e.lhs().value(), ae.m_e.rhs(), ae.m_e );
}
//____________________________________________________________________________//
inline check_type
operator<<( assertion_type const& , bitwise )
{
return CHECK_BUILT_ASSERTION;
}
//____________________________________________________________________________//
} // namespace tt_detail
} // namespace test_tools
} // namespace boost
#include <boost/test/detail/enable_warnings.hpp>
#endif // BOOST_TEST_TOOLS_DETAIL_BITWISE_MANIP_HPP_012705GER
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