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added in_place constructors

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This commit is contained in:
Andrzej Krzemienski
2016-10-27 01:08:17 +02:00
parent a710a23102
commit eb9ea1f72d
2 changed files with 406 additions and 25 deletions
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246
include/boost/optional/optional.hpp
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@ -56,6 +56,21 @@
#include <boost/optional/detail/old_optional_implementation.hpp>
#else
namespace boost {
namespace optional_ns {
class in_place_init_t {}; // a tag for in-place initialization
const in_place_init_t in_place_init; // of contained value
class in_place_init_if_t {}; // a tag for conditional in-place
const in_place_init_if_t in_place_init_if; // init of contained value
} // namespace optional_ns
using optional_ns::in_place_init_t;
using optional_ns::in_place_init;
using optional_ns::in_place_init_if_t;
using optional_ns::in_place_init_if;
namespace optional_detail {
@ -338,51 +353,177 @@ class optional_base : public optional_tag
#if (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES) && (!defined BOOST_NO_CXX11_VARIADIC_TEMPLATES)
// Constructs in-place
// upon exception *this is always uninitialized
template<class... Args>
void construct ( in_place_init_t, Args&&... args )
{
::new (m_storage.address()) value_type( boost::forward<Args>(args)... ) ;
m_initialized = true ;
}
template<class... Args>
void emplace_assign ( Args&&... args )
{
destroy();
::new (m_storage.address()) value_type( boost::forward<Args>(args)... );
m_initialized = true ;
}
{
destroy();
construct(in_place_init, boost::forward<Args>(args)...);
}
template<class... Args>
explicit optional_base ( in_place_init_t, Args&&... args )
:
m_initialized(false)
{
construct(in_place_init, boost::forward<Args>(args)...);
}
template<class... Args>
explicit optional_base ( in_place_init_if_t, bool cond, Args&&... args )
:
m_initialized(false)
{
if ( cond )
construct(in_place_init, boost::forward<Args>(args)...);
}
#elif (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
template<class Arg>
void emplace_assign ( Arg&& arg )
void construct ( in_place_init_t, Arg&& arg )
{
destroy();
::new (m_storage.address()) value_type( boost::forward<Arg>(arg) );
m_initialized = true ;
}
void emplace_assign ()
void construct ( in_place_init_t )
{
destroy();
::new (m_storage.address()) value_type();
m_initialized = true ;
}
#else
template<class Arg>
void emplace_assign ( const Arg& arg )
void emplace_assign ( Arg&& arg )
{
destroy();
construct(in_place_init, boost::forward<Arg>(arg)) ;
}
void emplace_assign ()
{
destroy();
construct(in_place_init) ;
}
explicit optional_base ( in_place_init_t, Arg&& args )
:
m_initialized(false)
{
construct(in_place_init, boost::forward<Arg>(arg));
}
explicit optional_base ( in_place_init_t )
:
m_initialized(false)
{
construct(in_place_init);
}
explicit optional_base ( in_place_init_if_t, bool cond, Arg&& args )
:
m_initialized(false)
{
if ( cond )
construct(in_place_init, boost::forward<Arg>(arg));
}
explicit optional_base ( in_place_init_if_t, bool cond )
:
m_initialized(false)
{
if ( cond )
construct(in_place_init);
}
#else
template<class Arg>
void construct ( in_place_init_t, const Arg& arg )
{
::new (m_storage.address()) value_type( arg );
m_initialized = true ;
}
template<class Arg>
void construct ( in_place_init_t, Arg& arg )
{
::new (m_storage.address()) value_type( arg );
m_initialized = true ;
}
void construct ( in_place_init_t )
{
::new (m_storage.address()) value_type();
m_initialized = true ;
}
template<class Arg>
void emplace_assign ( const Arg& arg )
{
destroy();
construct(in_place_init, arg);
}
template<class Arg>
void emplace_assign ( Arg& arg )
{
destroy();
::new (m_storage.address()) value_type( arg );
m_initialized = true ;
}
{
destroy();
construct(in_place_init, arg);
}
void emplace_assign ()
{
destroy();
::new (m_storage.address()) value_type();
m_initialized = true ;
}
{
destroy();
construct(in_place_init);
}
template<class Arg>
explicit optional_base ( in_place_init_t, const Arg& arg )
: m_initialized(false)
{
construct(in_place_init, arg);
}
template<class Arg>
explicit optional_base ( in_place_init_t, Arg& arg )
: m_initialized(false)
{
construct(in_place_init, arg);
}
explicit optional_base ( in_place_init_t )
: m_initialized(false)
{
construct(in_place_init);
}
template<class Arg>
explicit optional_base ( in_place_init_if_t, bool cond, const Arg& arg )
: m_initialized(false)
{
if ( cond )
construct(in_place_init, arg);
}
template<class Arg>
explicit optional_base ( in_place_init_if_t, bool cond, Arg& arg )
: m_initialized(false)
{
if ( cond )
construct(in_place_init, arg);
}
explicit optional_base ( in_place_init_if_t, bool cond )
: m_initialized(false)
{
if ( cond )
construct(in_place_init);
}
#endif
#ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
@ -820,9 +961,20 @@ class optional : public optional_detail::optional_base<T>
// upon exception *this is always uninitialized
template<class... Args>
void emplace ( Args&&... args )
{
this->emplace_assign( boost::forward<Args>(args)... );
}
{
this->emplace_assign( boost::forward<Args>(args)... );
}
template<class... Args>
explicit optional ( in_place_init_t, Args&&... args )
: base( in_place_init, boost::forward<Args>(args)... )
{}
template<class... Args>
explicit optional ( in_place_init_if_t, bool cond, Args&&... args )
: base( in_place_init_if, cond, boost::forward<Args>(args)... )
{}
#elif (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
template<class Arg>
void emplace ( Arg&& arg )
@ -834,6 +986,24 @@ class optional : public optional_detail::optional_base<T>
{
this->emplace_assign();
}
template<class Args>
explicit optional ( in_place_init_t, Args&& args )
: base( in_place_init, boost::forward<Args>(args) )
{}
explicit optional ( in_place_init_t )
: base( in_place_init )
{}
template<class Args>
explicit optional ( in_place_init_if_t, bool cond, Args&& args )
: base( in_place_init_if, cond, boost::forward<Args>(args) )
{}
explicit optional ( in_place_init_if_t, bool cond )
: base( in_place_init_if, cond )
{}
#else
template<class Arg>
void emplace ( const Arg& arg )
@ -851,6 +1021,34 @@ class optional : public optional_detail::optional_base<T>
{
this->emplace_assign();
}
template<class Arg>
explicit optional ( in_place_init_t, const Arg& arg )
: base( in_place_init, arg )
{}
template<class Arg>
explicit optional ( in_place_init_t, Arg& arg )
: base( in_place_init, arg )
{}
explicit optional ( in_place_init_t )
: base( in_place_init )
{}
template<class Arg>
explicit optional ( in_place_init_if_t, bool cond, const Arg& arg )
: base( in_place_init_if, cond, arg )
{}
template<class Arg>
explicit optional ( in_place_init_if_t, bool cond, Arg& arg )
: base( in_place_init_if, cond, arg )
{}
explicit optional ( in_place_init_if_t, bool cond )
: base( in_place_init_if, cond )
{}
#endif
void swap( optional & arg )