206 lines
7.1 KiB
Plaintext
206 lines
7.1 KiB
Plaintext
// (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 : $RCSfile$
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//
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// Version : $Revision: 74248 $
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//
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// Description : defines level of indiration facilitating workarounds for non printable types
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// ***************************************************************************
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#ifndef BOOST_TEST_TOOLS_IMPL_COMMON_HPP_012705GER
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#define BOOST_TEST_TOOLS_IMPL_COMMON_HPP_012705GER
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// Boost.Test
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#include <boost/test/detail/config.hpp>
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#include <boost/test/detail/global_typedef.hpp>
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#include <boost/test/detail/workaround.hpp>
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// Boost
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#include <boost/mpl/or.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/type_traits/is_array.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/type_traits/is_abstract.hpp>
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#include <boost/type_traits/has_left_shift.hpp>
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#include <limits>
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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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namespace tt_detail {
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// ************************************************************************** //
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// ************** print_log_value ************** //
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// ************************************************************************** //
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template<typename T>
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struct print_log_value {
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BOOST_STATIC_ASSERT_MSG( (boost::has_left_shift<std::ostream,T>::value),
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"Type has to implement operator<< to be printable");
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void operator()( std::ostream& ostr, T const& t )
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{
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typedef typename mpl::or_<is_array<T>,is_function<T>,is_abstract<T> >::type cant_use_nl;
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std::streamsize old_precision = set_precision( ostr, cant_use_nl() );
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ostr << t;
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if( old_precision != (std::streamsize)-1 )
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ostr.precision( old_precision );
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}
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std::streamsize set_precision( std::ostream& ostr, mpl::false_ )
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{
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if( std::numeric_limits<T>::is_specialized && std::numeric_limits<T>::radix == 2 )
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return ostr.precision( 2 + std::numeric_limits<T>::digits * 301/1000 );
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else if ( std::numeric_limits<T>::is_specialized && std::numeric_limits<T>::radix == 10 ) {
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#ifdef BOOST_NO_CXX11_NUMERIC_LIMITS
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// (was BOOST_NO_NUMERIC_LIMITS_LOWEST but now deprecated).
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// No support for std::numeric_limits<double>::max_digits10,
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// so guess that a couple of guard digits more than digits10 will display any difference.
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return ostr.precision( 2 + std::numeric_limits<T>::digits10 );
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#else
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// std::numeric_limits<double>::max_digits10; IS supported.
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// Any noisy or guard digits needed to display any difference are included in max_digits10.
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return ostr.precision( std::numeric_limits<T>::max_digits10 );
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#endif
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}
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// else if T is not specialized for std::numeric_limits<>,
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// then will just get the default precision of 6 digits.
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return (std::streamsize)-1;
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}
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std::streamsize set_precision( std::ostream&, mpl::true_ ) { return (std::streamsize)-1; }
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};
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//____________________________________________________________________________//
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#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
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template<typename T, std::size_t N >
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struct print_log_value< T[N] > {
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void operator()( std::ostream& ostr, T const* t )
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{
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ostr << t;
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}
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};
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#endif
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//____________________________________________________________________________//
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template<>
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struct BOOST_TEST_DECL print_log_value<bool> {
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void operator()( std::ostream& ostr, bool t )
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{
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ostr << std::boolalpha << t;
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}
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};
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//____________________________________________________________________________//
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template<>
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struct BOOST_TEST_DECL print_log_value<char> {
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void operator()( std::ostream& ostr, char t );
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};
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//____________________________________________________________________________//
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template<>
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struct BOOST_TEST_DECL print_log_value<unsigned char> {
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void operator()( std::ostream& ostr, unsigned char t );
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};
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//____________________________________________________________________________//
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template<>
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struct BOOST_TEST_DECL print_log_value<char const*> {
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void operator()( std::ostream& ostr, char const* t );
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};
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//____________________________________________________________________________//
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template<>
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struct BOOST_TEST_DECL print_log_value<wchar_t const*> {
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void operator()( std::ostream& ostr, wchar_t const* t );
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};
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//____________________________________________________________________________//
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// ************************************************************************** //
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// ************** print_helper ************** //
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// ************************************************************************** //
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// Adds level of indirection to the output operation, allowing us to customize
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// it for types that do not support operator << directly or for any other reason
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template<typename T>
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struct print_helper_t {
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explicit print_helper_t( T const& t ) : m_t( t ) {}
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T const& m_t;
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};
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//____________________________________________________________________________//
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#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
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// Borland suffers premature pointer decay passing arrays by reference
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template<typename T, std::size_t N >
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struct print_helper_t< T[N] > {
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explicit print_helper_t( T const * t ) : m_t( t ) {}
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T const * m_t;
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};
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#endif
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//____________________________________________________________________________//
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template<typename T>
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inline print_helper_t<T>
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print_helper( T const& t )
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{
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return print_helper_t<T>( t );
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}
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//____________________________________________________________________________//
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template<typename T>
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inline std::ostream&
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operator<<( std::ostream& ostr, print_helper_t<T> const& ph )
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{
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print_log_value<T>()( ostr, ph.m_t );
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return ostr;
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}
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//____________________________________________________________________________//
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} // namespace tt_detail
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// ************************************************************************** //
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// ************** BOOST_TEST_DONT_PRINT_LOG_VALUE ************** //
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// ************************************************************************** //
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#define BOOST_TEST_DONT_PRINT_LOG_VALUE( the_type ) \
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namespace boost{ namespace test_tools{ namespace tt_detail{ \
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template<> \
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struct print_log_value<the_type > { \
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void operator()( std::ostream&, the_type const& ) {} \
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}; \
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}}} \
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/**/
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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_IMPL_COMMON_HPP_012705GER
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