/usr/include/boost/parameter/aux_
Edit: /usr/include/boost/parameter/aux_/maybe.hpp (4254B)
// Copyright Daniel Wallin 2006.
// 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)
//
// 2009.10.21 TDS remove depenency on boost::python::detail::referent_storage
//
#ifndef BOOST_PARAMETER_MAYBE_091021_HPP
#define BOOST_PARAMETER_MAYBE_091021_HPP
namespace boost { namespace parameter { namespace aux {
template
struct referent_size;
}}} // namespace boost::parameter::aux
#include
namespace boost { namespace parameter { namespace aux {
template
struct referent_size
{
BOOST_STATIC_CONSTANT(::std::size_t, value = sizeof(T));
};
}}} // namespace boost::parameter::aux
#include
namespace boost { namespace parameter { namespace aux {
// A metafunction returning a POD type which can store U, where T == U&.
// If T is not a reference type, returns a POD which can store T.
template
struct referent_storage
: ::boost::aligned_storage<
::boost::parameter::aux::referent_size::value
>
{
};
}}} // namespace boost::parameter::aux
#include
#include
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
#include
#else // !defined(BOOST_PARAMETER_CAN_USE_MP11)
#include
#include
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
#include
#endif
#endif // BOOST_PARAMETER_CAN_USE_MP11
namespace boost { namespace parameter { namespace aux {
template
struct maybe : ::boost::parameter::aux::maybe_base
{
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
typedef typename ::std::add_lvalue_reference<
typename ::std::add_const::type
#else // !defined(BOOST_PARAMETER_CAN_USE_MP11)
typedef typename ::boost::add_lvalue_reference<
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
T const
#else
typename ::boost::add_const::type
#endif
#endif // BOOST_PARAMETER_CAN_USE_MP11
>::type reference;
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
typedef typename ::std::remove_cv<
typename ::std::remove_reference::type
#else
typedef typename ::boost::remove_cv<
BOOST_DEDUCED_TYPENAME ::boost::remove_reference::type
#endif
>::type non_cv_value;
inline explicit maybe(T value_) : value(value_), constructed(false)
{
}
inline maybe() : value(), constructed(false)
{
}
~maybe()
{
if (this->constructed)
{
this->destroy();
}
}
inline reference construct(reference value_) const
{
return value_;
}
template
reference construct2(U const& value_) const
{
new (this->m_storage.address()) non_cv_value(value_);
this->constructed = true;
return *reinterpret_cast(
this->m_storage.address()
);
}
template
inline reference construct(U const& value_) const
{
return this->construct2(value_);
}
void destroy()
{
reinterpret_cast(
this->m_storage.address()
)->~non_cv_value();
}
typedef reference(
::boost::parameter::aux::maybe::*safe_bool
)() const;
inline operator safe_bool() const
{
return this->value ? &::boost::parameter::aux::maybe::get : 0;
}
inline reference get() const
{
return this->value.get();
}
private:
::boost::optional value;
mutable bool constructed;
mutable typename ::boost::parameter::aux
::referent_storage::type m_storage;
};
}}} // namespace boost::parameter::aux
#endif // include guard