// (C) Copyright Gennadiy Rozental 2001.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//
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//! @file
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//! Bitwise comparison manipulator implementation
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// ***************************************************************************
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#ifndef BOOST_TEST_TOOLS_DETAIL_BITWISE_MANIP_HPP_012705GER
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#define BOOST_TEST_TOOLS_DETAIL_BITWISE_MANIP_HPP_012705GER
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// Boost Test
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#include <boost/test/tools/detail/fwd.hpp>
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#include <boost/test/tools/detail/indirections.hpp>
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#include <boost/test/tools/assertion_result.hpp>
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#include <boost/test/tools/assertion.hpp>
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// STL
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#include <climits> // for CHAR_BIT
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#include <boost/test/detail/suppress_warnings.hpp>
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//____________________________________________________________________________//
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namespace boost {
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namespace test_tools {
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// ************************************************************************** //
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// ************** bitwise comparison manipulator ************** //
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// ************************************************************************** //
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//! Bitwise comparison manipulator
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//! This is a terminal for the expression
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struct bitwise {};
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//____________________________________________________________________________//
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inline unit_test::lazy_ostream &
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operator<<( unit_test::lazy_ostream &o, bitwise ) { return o; }
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// needed for the lazy evaluation in lazy_ostream as bitwise is a terminal
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inline std::ostream&
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operator<<( std::ostream& o, bitwise ) { return o; }
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//____________________________________________________________________________//
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namespace tt_detail {
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/*!@brief Bitwise comparison of two operands
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*
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* This class constructs an @ref assertion_result that contains precise bit comparison information.
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* In particular the location of the mismatches (if any) are printed in the assertion result.
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*/
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template<typename Lhs, typename Rhs, typename E>
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inline assertion_result
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bitwise_compare(Lhs const& lhs, Rhs const& rhs, E const& expr )
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{
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assertion_result pr( true );
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std::size_t left_bit_size = sizeof(Lhs)*CHAR_BIT;
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std::size_t right_bit_size = sizeof(Rhs)*CHAR_BIT;
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static Lhs const leftOne( 1 );
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static Rhs const rightOne( 1 );
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std::size_t total_bits = left_bit_size < right_bit_size ? left_bit_size : right_bit_size;
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for( std::size_t counter = 0; counter < total_bits; ++counter ) {
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if( (lhs & ( leftOne << counter )) != (rhs & (rightOne << counter)) ) {
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if( pr ) {
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pr.message() << " [";
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expr.report( pr.message().stream() );
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pr.message() << "]. Bitwise comparison failed";
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pr = false;
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}
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pr.message() << "\nMismatch at position " << counter;
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}
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}
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if( left_bit_size != right_bit_size ) {
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if( pr ) {
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pr.message() << " [";
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expr.report( pr.message().stream() );
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pr.message() << "]. Bitwise comparison failed";
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pr = false;
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}
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pr.message() << "\nOperands bit sizes mismatch: " << left_bit_size << " != " << right_bit_size;
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}
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return pr;
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}
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//____________________________________________________________________________//
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//! Returns an assertion_result using the bitwise comparison out of an expression
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//!
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//! This is used as a modifer of the normal operator<< on expressions to use the
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//! bitwise comparison.
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//!
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//! @note Available only for compilers supporting the @c auto declaration.
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template<typename T1, typename T2, typename T3, typename T4>
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inline assertion_result
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operator<<(assertion_evaluate_t<assertion::binary_expr<T1,T2,assertion::op::EQ<T3,T4> > > const& ae, bitwise )
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{
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return bitwise_compare( ae.m_e.lhs().value(), ae.m_e.rhs(), ae.m_e );
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}
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//____________________________________________________________________________//
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inline assertion_type
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operator<<( assertion_type const& , bitwise )
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{
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return assertion_type(CHECK_BUILT_ASSERTION);
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}
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//____________________________________________________________________________//
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} // namespace tt_detail
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} // namespace test_tools
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} // namespace boost
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#include <boost/test/detail/enable_warnings.hpp>
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#endif // BOOST_TEST_TOOLS_DETAIL_BITWISE_MANIP_HPP_012705GER
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