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Initial work for G-code sender and more intensive usage of Boost

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Alessandro Ranellucci 2014-11-26 22:30:25 +01:00
parent 43cbad8867
commit 11dd67ab34
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258
xs/src/boost/utility/value_init.hpp
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// (C) Copyright 2002-2008, Fernando Luis Cacciola Carballal.
//
// 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)
//
// 21 Ago 2002 (Created) Fernando Cacciola
// 24 Dec 2007 (Refactored and worked around various compiler bugs) Fernando Cacciola, Niels Dekker
// 23 May 2008 (Fixed operator= const issue, added initialized_value) Niels Dekker, Fernando Cacciola
// 21 Ago 2008 (Added swap) Niels Dekker, Fernando Cacciola
// 20 Feb 2009 (Fixed logical const-ness issues) Niels Dekker, Fernando Cacciola
// 03 Apr 2010 (Added initialized<T>, suggested by Jeffrey Hellrung, fixing #3472) Niels Dekker
// 30 May 2010 (Made memset call conditional, fixing #3869) Niels Dekker
//
#ifndef BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP
#define BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP
// Note: The implementation of boost::value_initialized had to deal with the
// fact that various compilers haven't fully implemented value-initialization.
// The constructor of boost::value_initialized<T> works around these compiler
// issues, by clearing the bytes of T, before constructing the T object it
// contains. More details on these issues are at libs/utility/value_init.htm
#include <boost/aligned_storage.hpp>
#include <boost/config.hpp> // For BOOST_NO_COMPLETE_VALUE_INITIALIZATION.
#include <boost/detail/workaround.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/cv_traits.hpp>
#include <boost/type_traits/alignment_of.hpp>
#include <boost/swap.hpp>
#include <cstring>
#include <new>
#ifdef BOOST_MSVC
#pragma warning(push)
#if _MSC_VER >= 1310
// It is safe to ignore the following warning from MSVC 7.1 or higher:
// "warning C4351: new behavior: elements of array will be default initialized"
#pragma warning(disable: 4351)
// It is safe to ignore the following MSVC warning, which may pop up when T is
// a const type: "warning C4512: assignment operator could not be generated".
#pragma warning(disable: 4512)
#endif
#endif
#ifdef BOOST_NO_COMPLETE_VALUE_INITIALIZATION
// Implementation detail: The macro BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
// suggests that a workaround should be applied, because of compiler issues
// regarding value-initialization.
#define BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
#endif
// Implementation detail: The macro BOOST_DETAIL_VALUE_INIT_WORKAROUND
// switches the value-initialization workaround either on or off.
#ifndef BOOST_DETAIL_VALUE_INIT_WORKAROUND
#ifdef BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
#define BOOST_DETAIL_VALUE_INIT_WORKAROUND 1
#else
#define BOOST_DETAIL_VALUE_INIT_WORKAROUND 0
#endif
#endif
namespace boost {
template<class T>
class initialized
{
private :
struct wrapper
{
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
typename
#endif
remove_const<T>::type data;
wrapper()
:
data()
{
}
wrapper(T const & arg)
:
data(arg)
{
}
};
mutable
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
typename
#endif
aligned_storage<sizeof(wrapper), alignment_of<wrapper>::value>::type x;
wrapper * wrapper_address() const
{
return static_cast<wrapper *>( static_cast<void*>(&x));
}
public :
initialized()
{
#if BOOST_DETAIL_VALUE_INIT_WORKAROUND
std::memset(&x, 0, sizeof(x));
#endif
new (wrapper_address()) wrapper();
}
initialized(initialized const & arg)
{
new (wrapper_address()) wrapper( static_cast<wrapper const &>(*(arg.wrapper_address())));
}
explicit initialized(T const & arg)
{
new (wrapper_address()) wrapper(arg);
}
initialized & operator=(initialized const & arg)
{
// Assignment is only allowed when T is non-const.
BOOST_STATIC_ASSERT( ! is_const<T>::value );
*wrapper_address() = static_cast<wrapper const &>(*(arg.wrapper_address()));
return *this;
}
~initialized()
{
wrapper_address()->wrapper::~wrapper();
}
T const & data() const
{
return wrapper_address()->data;
}
T& data()
{
return wrapper_address()->data;
}
void swap(initialized & arg)
{
::boost::swap( this->data(), arg.data() );
}
operator T const &() const
{
return wrapper_address()->data;
}
operator T&()
{
return wrapper_address()->data;
}
} ;
template<class T>
T const& get ( initialized<T> const& x )
{
return x.data() ;
}
template<class T>
T& get ( initialized<T>& x )
{
return x.data() ;
}
template<class T>
void swap ( initialized<T> & lhs, initialized<T> & rhs )
{
lhs.swap(rhs) ;
}
template<class T>
class value_initialized
{
private :
// initialized<T> does value-initialization by default.
initialized<T> m_data;
public :
value_initialized()
:
m_data()
{ }
T const & data() const
{
return m_data.data();
}
T& data()
{
return m_data.data();
}
void swap(value_initialized & arg)
{
m_data.swap(arg.m_data);
}
operator T const &() const
{
return m_data;
}
operator T&()
{
return m_data;
}
} ;
template<class T>
T const& get ( value_initialized<T> const& x )
{
return x.data() ;
}
template<class T>
T& get ( value_initialized<T>& x )
{
return x.data() ;
}
template<class T>
void swap ( value_initialized<T> & lhs, value_initialized<T> & rhs )
{
lhs.swap(rhs) ;
}
class initialized_value_t
{
public :
template <class T> operator T() const
{
return initialized<T>().data();
}
};
initialized_value_t const initialized_value = {} ;
} // namespace boost
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
#endif