63e88f80
 Hu Chunming
提交三方库
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
// (C) Copyright 2005-2007 Jonathan Turkanis
// 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/iostreams for documentation.
// Recent changes to Boost.Optional involving assigment broke Boost.Iostreams,
// in a way which could be remedied only by relying on the deprecated reset
// functions; with VC6, even reset didn't work. Until this problem is
// understood, Iostreams will use a private version of optional with a smart
// pointer interface.
#ifndef BOOST_IOSTREAMS_DETAIL_OPTIONAL_HPP_INCLUDED
#define BOOST_IOSTREAMS_DETAIL_OPTIONAL_HPP_INCLUDED
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/assert.hpp>
#include <boost/mpl/int.hpp>
#include <boost/type_traits/aligned_storage.hpp>
#include <boost/type_traits/alignment_of.hpp>
namespace boost { namespace iostreams { namespace detail {
// Taken from <boost/optional.hpp>.
template<class T>
class aligned_storage
{
// Borland ICEs if unnamed unions are used for this!
union dummy_u
{
char data[ sizeof(T) ];
BOOST_DEDUCED_TYPENAME type_with_alignment<
::boost::alignment_of<T>::value >::type aligner_;
} dummy_ ;
public:
void const* address() const { return &dummy_.data[0]; }
void * address() { return &dummy_.data[0]; }
};
template<typename T>
class optional {
public:
typedef T element_type;
optional() : initialized_(false) { }
optional(const T& t) : initialized_(false) { reset(t); }
~optional() { reset(); }
T& operator*()
{
BOOST_ASSERT(initialized_);
return *static_cast<T*>(address());
}
const T& operator*() const
{
BOOST_ASSERT(initialized_);
return *static_cast<const T*>(address());
}
T* operator->()
{
BOOST_ASSERT(initialized_);
return static_cast<T*>(address());
}
const T* operator->() const
{
BOOST_ASSERT(initialized_);
return static_cast<const T*>(address());
}
T* get()
{
BOOST_ASSERT(initialized_);
return static_cast<T*>(address());
}
const T* get() const
{
BOOST_ASSERT(initialized_);
return static_cast<const T*>(address());
}
void reset()
{
if (initialized_) {
#if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x564)) || \
BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600)) \
/**/
T* t = static_cast<T*>(address());
t->~T();
#else
static_cast<T*>(address())->T::~T();
#endif
initialized_ = false;
}
}
void reset(const T& t)
{
reset();
new (address()) T(t);
initialized_ = true;
}
private:
optional(const optional&);
optional& operator=(const optional&);
void* address() { return &storage_; }
const void* address() const { return &storage_; }
aligned_storage<T> storage_;
bool initialized_;
};
} } } // End namespaces detail, iostreams, boost.
#endif // #ifndef BOOST_IOSTREAMS_DETAIL_OPTIONAL_HPP_INCLUDED
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