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ext-boost/boost/optional/optional.hpp
Yuri Kunde Schlesner 25db91d480 Update to boost v1.63.0
2017-03-12 21:30:15 -07:00

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// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal.
// Copyright (C) 2014 - 2016 Andrzej Krzemienski.
//
// Use, modification, and distribution is subject to 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/optional for documentation.
//
// You are welcome to contact the author at:
// fernando_cacciola@hotmail.com
//
// Revisions:
// 27 Apr 2008 (improved swap) Fernando Cacciola, Niels Dekker, Thorsten Ottosen
// 05 May 2014 (Added move semantics) Andrzej Krzemienski
//
#ifndef BOOST_OPTIONAL_OPTIONAL_FLC_19NOV2002_HPP
#define BOOST_OPTIONAL_OPTIONAL_FLC_19NOV2002_HPP
#include <new>
#include <iosfwd>
#include <boost/assert.hpp>
#include <boost/core/addressof.hpp>
#include <boost/core/enable_if.hpp>
#include <boost/core/explicit_operator_bool.hpp>
#include <boost/core/swap.hpp>
#include <boost/optional/bad_optional_access.hpp>
#include <boost/static_assert.hpp>
#include <boost/throw_exception.hpp>
#include <boost/type.hpp>
#include <boost/type_traits/alignment_of.hpp>
#include <boost/type_traits/conditional.hpp>
#include <boost/type_traits/has_nothrow_constructor.hpp>
#include <boost/type_traits/type_with_alignment.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/decay.hpp>
#include <boost/type_traits/is_base_of.hpp>
#include <boost/type_traits/is_constructible.hpp>
#include <boost/type_traits/is_lvalue_reference.hpp>
#include <boost/type_traits/is_nothrow_move_assignable.hpp>
#include <boost/type_traits/is_nothrow_move_constructible.hpp>
#include <boost/type_traits/is_rvalue_reference.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/move/utility.hpp>
#include <boost/none.hpp>
#include <boost/utility/compare_pointees.hpp>
#include <boost/optional/optional_fwd.hpp>
#include <boost/optional/detail/optional_config.hpp>
#include <boost/optional/detail/optional_factory_support.hpp>
#include <boost/optional/detail/optional_aligned_storage.hpp>
#ifdef BOOST_OPTIONAL_CONFIG_USE_OLD_IMPLEMENTATION_OF_OPTIONAL
#include <boost/optional/detail/old_optional_implementation.hpp>
#else
namespace boost {
namespace optional_ns {
// a tag for in-place initialization of contained value
struct in_place_init_t
{
struct init_tag{};
explicit in_place_init_t(init_tag){}
};
const in_place_init_t in_place_init ((in_place_init_t::init_tag()));
// a tag for conditional in-place initialization of contained value
struct in_place_init_if_t
{
struct init_tag{};
explicit in_place_init_if_t(init_tag){}
};
const in_place_init_if_t in_place_init_if ((in_place_init_if_t::init_tag()));
} // 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 {
struct optional_tag {} ;
template<class T>
class optional_base : public optional_tag
{
private :
typedef aligned_storage<T> storage_type ;
typedef optional_base<T> this_type ;
protected :
typedef T value_type ;
protected:
typedef T & reference_type ;
typedef T const& reference_const_type ;
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
typedef T && rval_reference_type ;
typedef T && reference_type_of_temporary_wrapper ;
#endif
typedef T * pointer_type ;
typedef T const* pointer_const_type ;
typedef T const& argument_type ;
// Creates an optional<T> uninitialized.
// No-throw
optional_base()
:
m_initialized(false) {}
// Creates an optional<T> uninitialized.
// No-throw
optional_base ( none_t )
:
m_initialized(false) {}
// Creates an optional<T> initialized with 'val'.
// Can throw if T::T(T const&) does
optional_base ( argument_type val )
:
m_initialized(false)
{
construct(val);
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// move-construct an optional<T> initialized from an rvalue-ref to 'val'.
// Can throw if T::T(T&&) does
optional_base ( rval_reference_type val )
:
m_initialized(false)
{
construct( boost::move(val) );
}
#endif
// Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialzed optional<T>.
// Can throw if T::T(T const&) does
optional_base ( bool cond, argument_type val )
:
m_initialized(false)
{
if ( cond )
construct(val);
}
// Creates a deep copy of another optional<T>
// Can throw if T::T(T const&) does
optional_base ( optional_base const& rhs )
:
m_initialized(false)
{
if ( rhs.is_initialized() )
construct(rhs.get_impl());
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Creates a deep move of another optional<T>
// Can throw if T::T(T&&) does
optional_base ( optional_base&& rhs )
:
m_initialized(false)
{
if ( rhs.is_initialized() )
construct( boost::move(rhs.get_impl()) );
}
#endif
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template<class Expr, class PtrExpr>
explicit optional_base ( Expr&& expr, PtrExpr const* tag )
:
m_initialized(false)
{
construct(boost::forward<Expr>(expr),tag);
}
#else
// This is used for both converting and in-place constructions.
// Derived classes use the 'tag' to select the appropriate
// implementation (the correct 'construct()' overload)
template<class Expr>
explicit optional_base ( Expr const& expr, Expr const* tag )
:
m_initialized(false)
{
construct(expr,tag);
}
#endif
// No-throw (assuming T::~T() doesn't)
~optional_base() { destroy() ; }
// Assigns from another optional<T> (deep-copies the rhs value)
void assign ( optional_base const& rhs )
{
if (is_initialized())
{
if ( rhs.is_initialized() )
assign_value(rhs.get_impl());
else destroy();
}
else
{
if ( rhs.is_initialized() )
construct(rhs.get_impl());
}
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Assigns from another optional<T> (deep-moves the rhs value)
void assign ( optional_base&& rhs )
{
if (is_initialized())
{
if ( rhs.is_initialized() )
assign_value( boost::move(rhs.get_impl()) );
else destroy();
}
else
{
if ( rhs.is_initialized() )
construct(boost::move(rhs.get_impl()));
}
}
#endif
// Assigns from another _convertible_ optional<U> (deep-copies the rhs value)
template<class U>
void assign ( optional<U> const& rhs )
{
if (is_initialized())
{
if ( rhs.is_initialized() )
#ifndef BOOST_OPTIONAL_CONFIG_RESTORE_ASSIGNMENT_OF_NONCONVERTIBLE_TYPES
assign_value( rhs.get() );
#else
assign_value( static_cast<value_type>(rhs.get()) );
#endif
else destroy();
}
else
{
if ( rhs.is_initialized() )
#ifndef BOOST_OPTIONAL_CONFIG_RESTORE_ASSIGNMENT_OF_NONCONVERTIBLE_TYPES
construct(rhs.get());
#else
construct(static_cast<value_type>(rhs.get()));
#endif
}
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// move-assigns from another _convertible_ optional<U> (deep-moves from the rhs value)
template<class U>
void assign ( optional<U>&& rhs )
{
typedef BOOST_DEDUCED_TYPENAME optional<U>::rval_reference_type ref_type;
if (is_initialized())
{
if ( rhs.is_initialized() )
assign_value( static_cast<ref_type>(rhs.get()) );
else destroy();
}
else
{
if ( rhs.is_initialized() )
construct(static_cast<ref_type>(rhs.get()));
}
}
#endif
// Assigns from a T (deep-copies the rhs value)
void assign ( argument_type val )
{
if (is_initialized())
assign_value(val);
else construct(val);
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Assigns from a T (deep-moves the rhs value)
void assign ( rval_reference_type val )
{
if (is_initialized())
assign_value( boost::move(val) );
else construct( boost::move(val) );
}
#endif
// Assigns from "none", destroying the current value, if any, leaving this UNINITIALIZED
// No-throw (assuming T::~T() doesn't)
void assign ( none_t ) BOOST_NOEXCEPT { destroy(); }
#ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template<class Expr, class ExprPtr>
void assign_expr ( Expr&& expr, ExprPtr const* tag )
{
if (is_initialized())
assign_expr_to_initialized(boost::forward<Expr>(expr),tag);
else construct(boost::forward<Expr>(expr),tag);
}
#else
template<class Expr>
void assign_expr ( Expr const& expr, Expr const* tag )
{
if (is_initialized())
assign_expr_to_initialized(expr,tag);
else construct(expr,tag);
}
#endif
#endif
public :
// **DEPPRECATED** Destroys the current value, if any, leaving this UNINITIALIZED
// No-throw (assuming T::~T() doesn't)
void reset() BOOST_NOEXCEPT { destroy(); }
// **DEPPRECATED** Replaces the current value -if any- with 'val'
void reset ( argument_type val ) { assign(val); }
// Returns a pointer to the value if this is initialized, otherwise,
// returns NULL.
// No-throw
pointer_const_type get_ptr() const { return m_initialized ? get_ptr_impl() : 0 ; }
pointer_type get_ptr() { return m_initialized ? get_ptr_impl() : 0 ; }
bool is_initialized() const { return m_initialized ; }
protected :
void construct ( argument_type val )
{
::new (m_storage.address()) value_type(val) ;
m_initialized = true ;
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
void construct ( rval_reference_type val )
{
::new (m_storage.address()) value_type( boost::move(val) ) ;
m_initialized = true ;
}
#endif
#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();
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 construct ( in_place_init_t, Arg&& arg )
{
::new (m_storage.address()) value_type( boost::forward<Arg>(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 ( Arg&& arg )
{
destroy();
construct(in_place_init, boost::forward<Arg>(arg)) ;
}
void emplace_assign ()
{
destroy();
construct(in_place_init) ;
}
template<class Arg>
explicit optional_base ( in_place_init_t, Arg&& arg )
:
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);
}
template<class Arg>
explicit optional_base ( in_place_init_if_t, bool cond, Arg&& arg )
:
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();
construct(in_place_init, arg);
}
void emplace_assign ()
{
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
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Constructs in-place using the given factory
template<class Expr>
void construct ( Expr&& factory, in_place_factory_base const* )
{
boost_optional_detail::construct<value_type>(factory, m_storage.address());
m_initialized = true ;
}
// Constructs in-place using the given typed factory
template<class Expr>
void construct ( Expr&& factory, typed_in_place_factory_base const* )
{
factory.apply(m_storage.address()) ;
m_initialized = true ;
}
template<class Expr>
void assign_expr_to_initialized ( Expr&& factory, in_place_factory_base const* tag )
{
destroy();
construct(factory,tag);
}
// Constructs in-place using the given typed factory
template<class Expr>
void assign_expr_to_initialized ( Expr&& factory, typed_in_place_factory_base const* tag )
{
destroy();
construct(factory,tag);
}
#else
// Constructs in-place using the given factory
template<class Expr>
void construct ( Expr const& factory, in_place_factory_base const* )
{
boost_optional_detail::construct<value_type>(factory, m_storage.address());
m_initialized = true ;
}
// Constructs in-place using the given typed factory
template<class Expr>
void construct ( Expr const& factory, typed_in_place_factory_base const* )
{
factory.apply(m_storage.address()) ;
m_initialized = true ;
}
template<class Expr>
void assign_expr_to_initialized ( Expr const& factory, in_place_factory_base const* tag )
{
destroy();
construct(factory,tag);
}
// Constructs in-place using the given typed factory
template<class Expr>
void assign_expr_to_initialized ( Expr const& factory, typed_in_place_factory_base const* tag )
{
destroy();
construct(factory,tag);
}
#endif
#endif
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Constructs using any expression implicitly convertible to the single argument
// of a one-argument T constructor.
// Converting constructions of optional<T> from optional<U> uses this function with
// 'Expr' being of type 'U' and relying on a converting constructor of T from U.
template<class Expr>
void construct ( Expr&& expr, void const* )
{
new (m_storage.address()) value_type(boost::forward<Expr>(expr)) ;
m_initialized = true ;
}
// Assigns using a form any expression implicitly convertible to the single argument
// of a T's assignment operator.
// Converting assignments of optional<T> from optional<U> uses this function with
// 'Expr' being of type 'U' and relying on a converting assignment of T from U.
template<class Expr>
void assign_expr_to_initialized ( Expr&& expr, void const* )
{
assign_value( boost::forward<Expr>(expr) );
}
#else
// Constructs using any expression implicitly convertible to the single argument
// of a one-argument T constructor.
// Converting constructions of optional<T> from optional<U> uses this function with
// 'Expr' being of type 'U' and relying on a converting constructor of T from U.
template<class Expr>
void construct ( Expr const& expr, void const* )
{
new (m_storage.address()) value_type(expr) ;
m_initialized = true ;
}
// Assigns using a form any expression implicitly convertible to the single argument
// of a T's assignment operator.
// Converting assignments of optional<T> from optional<U> uses this function with
// 'Expr' being of type 'U' and relying on a converting assignment of T from U.
template<class Expr>
void assign_expr_to_initialized ( Expr const& expr, void const* )
{
assign_value(expr);
}
#endif
#ifdef BOOST_OPTIONAL_WEAK_OVERLOAD_RESOLUTION
// BCB5.64 (and probably lower versions) workaround.
// The in-place factories are supported by means of catch-all constructors
// and assignment operators (the functions are parameterized in terms of
// an arbitrary 'Expr' type)
// This compiler incorrectly resolves the overload set and sinks optional<T> and optional<U>
// to the 'Expr'-taking functions even though explicit overloads are present for them.
// Thus, the following overload is needed to properly handle the case when the 'lhs'
// is another optional.
//
// For VC<=70 compilers this workaround dosen't work becasue the comnpiler issues and error
// instead of choosing the wrong overload
//
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Notice that 'Expr' will be optional<T> or optional<U> (but not optional_base<..>)
template<class Expr>
void construct ( Expr&& expr, optional_tag const* )
{
if ( expr.is_initialized() )
{
// An exception can be thrown here.
// It it happens, THIS will be left uninitialized.
new (m_storage.address()) value_type(boost::move(expr.get())) ;
m_initialized = true ;
}
}
#else
// Notice that 'Expr' will be optional<T> or optional<U> (but not optional_base<..>)
template<class Expr>
void construct ( Expr const& expr, optional_tag const* )
{
if ( expr.is_initialized() )
{
// An exception can be thrown here.
// It it happens, THIS will be left uninitialized.
new (m_storage.address()) value_type(expr.get()) ;
m_initialized = true ;
}
}
#endif
#endif // defined BOOST_OPTIONAL_WEAK_OVERLOAD_RESOLUTION
void assign_value ( argument_type val ) { get_impl() = val; }
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
void assign_value ( rval_reference_type val ) { get_impl() = static_cast<rval_reference_type>(val); }
#endif
void destroy()
{
if ( m_initialized )
destroy_impl() ;
}
reference_const_type get_impl() const { return m_storage.ref() ; }
reference_type get_impl() { return m_storage.ref() ; }
pointer_const_type get_ptr_impl() const { return m_storage.ptr_ref(); }
pointer_type get_ptr_impl() { return m_storage.ptr_ref(); }
private :
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1600)
void destroy_impl ( ) { m_storage.ptr_ref()->~T() ; m_initialized = false ; }
#else
void destroy_impl ( ) { m_storage.ref().T::~T() ; m_initialized = false ; }
#endif
bool m_initialized ;
storage_type m_storage ;
} ;
// definition of metafunciton is_optional_val_init_candidate
template <typename U>
struct is_optional_related
: boost::conditional< boost::is_base_of<optional_detail::optional_tag, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
|| boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, none_t>::value
|| boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, in_place_init_t>::value
|| boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, in_place_init_if_t>::value,
boost::true_type, boost::false_type>::type
{};
#if !defined(BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT)
template <typename T, typename U>
struct is_convertible_to_T_or_factory
: boost::conditional< boost::is_base_of<boost::in_place_factory_base, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
|| boost::is_base_of<boost::typed_in_place_factory_base, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
|| (boost::is_constructible<T, U&&>::value && !boost::is_same<T, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value)
, boost::true_type, boost::false_type>::type
{};
template <typename T, typename U>
struct is_optional_constructible : boost::is_constructible<T, U>
{};
#else
template <typename, typename>
struct is_convertible_to_T_or_factory : boost::true_type
{};
template <typename T, typename U>
struct is_optional_constructible : boost::true_type
{};
#endif // is_convertible condition
template <typename T, typename U>
struct is_optional_val_init_candidate
: boost::conditional< !is_optional_related<U>::value && is_convertible_to_T_or_factory<T, U>::value
, boost::true_type, boost::false_type>::type
{};
} // namespace optional_detail
template<class T>
class optional : public optional_detail::optional_base<T>
{
typedef optional_detail::optional_base<T> base ;
public :
typedef optional<T> this_type ;
typedef BOOST_DEDUCED_TYPENAME base::value_type value_type ;
typedef BOOST_DEDUCED_TYPENAME base::reference_type reference_type ;
typedef BOOST_DEDUCED_TYPENAME base::reference_const_type reference_const_type ;
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
typedef BOOST_DEDUCED_TYPENAME base::rval_reference_type rval_reference_type ;
typedef BOOST_DEDUCED_TYPENAME base::reference_type_of_temporary_wrapper reference_type_of_temporary_wrapper ;
#endif
typedef BOOST_DEDUCED_TYPENAME base::pointer_type pointer_type ;
typedef BOOST_DEDUCED_TYPENAME base::pointer_const_type pointer_const_type ;
typedef BOOST_DEDUCED_TYPENAME base::argument_type argument_type ;
// Creates an optional<T> uninitialized.
// No-throw
optional() BOOST_NOEXCEPT : base() {}
// Creates an optional<T> uninitialized.
// No-throw
optional( none_t none_ ) BOOST_NOEXCEPT : base(none_) {}
// Creates an optional<T> initialized with 'val'.
// Can throw if T::T(T const&) does
optional ( argument_type val ) : base(val) {}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Creates an optional<T> initialized with 'move(val)'.
// Can throw if T::T(T &&) does
optional ( rval_reference_type val ) : base( boost::forward<T>(val) )
{}
#endif
// Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialized optional.
// Can throw if T::T(T const&) does
optional ( bool cond, argument_type val ) : base(cond,val) {}
// NOTE: MSVC needs templated versions first
// Creates a deep copy of another convertible optional<U>
// Requires a valid conversion from U to T.
// Can throw if T::T(U const&) does
template<class U>
explicit optional ( optional<U> const& rhs
#ifndef BOOST_OPTIONAL_DETAIL_NO_SFINAE_FRIENDLY_CONSTRUCTORS
,typename boost::enable_if< optional_detail::is_optional_constructible<T, U const&> >::type* = 0
#endif
)
:
base()
{
if ( rhs.is_initialized() )
this->construct(rhs.get());
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Creates a deep move of another convertible optional<U>
// Requires a valid conversion from U to T.
// Can throw if T::T(U&&) does
template<class U>
explicit optional ( optional<U> && rhs
#ifndef BOOST_OPTIONAL_DETAIL_NO_SFINAE_FRIENDLY_CONSTRUCTORS
,typename boost::enable_if< optional_detail::is_optional_constructible<T, U> >::type* = 0
#endif
)
:
base()
{
if ( rhs.is_initialized() )
this->construct( boost::move(rhs.get()) );
}
#endif
#ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
// Creates an optional<T> with an expression which can be either
// (a) An instance of InPlaceFactory (i.e. in_place(a,b,...,n);
// (b) An instance of TypedInPlaceFactory ( i.e. in_place<T>(a,b,...,n);
// (c) Any expression implicitly convertible to the single type
// of a one-argument T's constructor.
// (d*) Weak compilers (BCB) might also resolved Expr as optional<T> and optional<U>
// even though explicit overloads are present for these.
// Depending on the above some T ctor is called.
// Can throw if the resolved T ctor throws.
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template<class Expr>
explicit optional ( Expr&& expr,
BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_val_init_candidate<T, Expr> >::type* = 0
)
: base(boost::forward<Expr>(expr),boost::addressof(expr))
{}
#else
template<class Expr>
explicit optional ( Expr const& expr ) : base(expr,boost::addressof(expr)) {}
#endif // !defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
#endif // !defined BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
// Creates a deep copy of another optional<T>
// Can throw if T::T(T const&) does
optional ( optional const& rhs ) : base( static_cast<base const&>(rhs) ) {}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Creates a deep move of another optional<T>
// Can throw if T::T(T&&) does
optional ( optional && rhs )
BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value)
: base( boost::move(rhs) )
{}
#endif
#if BOOST_WORKAROUND(_MSC_VER, <= 1600)
// On old MSVC compilers the implicitly declared dtor is not called
~optional() {}
#endif
#if !defined(BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT) && !defined(BOOST_OPTIONAL_WEAK_OVERLOAD_RESOLUTION)
// Assigns from an expression. See corresponding constructor.
// Basic Guarantee: If the resolved T ctor throws, this is left UNINITIALIZED
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template<class Expr>
BOOST_DEDUCED_TYPENAME boost::enable_if<optional_detail::is_optional_val_init_candidate<T, Expr>, optional&>::type
operator= ( Expr&& expr )
{
this->assign_expr(boost::forward<Expr>(expr),boost::addressof(expr));
return *this ;
}
#else
template<class Expr>
optional& operator= ( Expr const& expr )
{
this->assign_expr(expr,boost::addressof(expr));
return *this ;
}
#endif // !defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
#endif // !defined(BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT) && !defined(BOOST_OPTIONAL_WEAK_OVERLOAD_RESOLUTION)
// Copy-assigns from another convertible optional<U> (converts && deep-copies the rhs value)
// Requires a valid conversion from U to T.
// Basic Guarantee: If T::T( U const& ) throws, this is left UNINITIALIZED
template<class U>
optional& operator= ( optional<U> const& rhs )
{
this->assign(rhs);
return *this ;
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Move-assigns from another convertible optional<U> (converts && deep-moves the rhs value)
// Requires a valid conversion from U to T.
// Basic Guarantee: If T::T( U && ) throws, this is left UNINITIALIZED
template<class U>
optional& operator= ( optional<U> && rhs )
{
this->assign(boost::move(rhs));
return *this ;
}
#endif
// Assigns from another optional<T> (deep-copies the rhs value)
// Basic Guarantee: If T::T( T const& ) throws, this is left UNINITIALIZED
// (NOTE: On BCB, this operator is not actually called and left is left UNMODIFIED in case of a throw)
optional& operator= ( optional const& rhs )
{
this->assign( static_cast<base const&>(rhs) ) ;
return *this ;
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Assigns from another optional<T> (deep-moves the rhs value)
optional& operator= ( optional && rhs )
BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value && ::boost::is_nothrow_move_assignable<T>::value)
{
this->assign( static_cast<base &&>(rhs) ) ;
return *this ;
}
#endif
#ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
// Assigns from a T (deep-moves/copies the rhs value)
template <typename T_>
BOOST_DEDUCED_TYPENAME boost::enable_if<boost::is_same<T, BOOST_DEDUCED_TYPENAME boost::decay<T_>::type>, optional&>::type
operator= ( T_&& val )
{
this->assign( boost::forward<T_>(val) ) ;
return *this ;
}
#else
// Assigns from a T (deep-copies the rhs value)
// Basic Guarantee: If T::( T const& ) throws, this is left UNINITIALIZED
optional& operator= ( argument_type val )
{
this->assign( val ) ;
return *this ;
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Assigns from a T (deep-moves the rhs value)
optional& operator= ( rval_reference_type val )
{
this->assign( boost::move(val) ) ;
return *this ;
}
#endif
#endif // BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
// Assigns from a "none"
// Which destroys the current value, if any, leaving this UNINITIALIZED
// No-throw (assuming T::~T() doesn't)
optional& operator= ( none_t none_ ) BOOST_NOEXCEPT
{
this->assign( none_ ) ;
return *this ;
}
#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 emplace ( 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 )
{
this->emplace_assign( boost::forward<Arg>(arg) );
}
void emplace ()
{
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 )
{
this->emplace_assign( arg );
}
template<class Arg>
void emplace ( Arg& arg )
{
this->emplace_assign( arg );
}
void emplace ()
{
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 )
BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value && ::boost::is_nothrow_move_assignable<T>::value)
{
// allow for Koenig lookup
boost::swap(*this, arg);
}
// Returns a reference to the value if this is initialized, otherwise,
// the behaviour is UNDEFINED
// No-throw
reference_const_type get() const { BOOST_ASSERT(this->is_initialized()) ; return this->get_impl(); }
reference_type get() { BOOST_ASSERT(this->is_initialized()) ; return this->get_impl(); }
// Returns a copy of the value if this is initialized, 'v' otherwise
reference_const_type get_value_or ( reference_const_type v ) const { return this->is_initialized() ? get() : v ; }
reference_type get_value_or ( reference_type v ) { return this->is_initialized() ? get() : v ; }
// Returns a pointer to the value if this is initialized, otherwise,
// the behaviour is UNDEFINED
// No-throw
pointer_const_type operator->() const { BOOST_ASSERT(this->is_initialized()) ; return this->get_ptr_impl() ; }
pointer_type operator->() { BOOST_ASSERT(this->is_initialized()) ; return this->get_ptr_impl() ; }
// Returns a reference to the value if this is initialized, otherwise,
// the behaviour is UNDEFINED
// No-throw
#if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
reference_const_type operator *() const& { return this->get() ; }
reference_type operator *() & { return this->get() ; }
reference_type_of_temporary_wrapper operator *() && { return boost::move(this->get()) ; }
#else
reference_const_type operator *() const { return this->get() ; }
reference_type operator *() { return this->get() ; }
#endif // !defined BOOST_NO_CXX11_REF_QUALIFIERS
#if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
reference_const_type value() const&
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access());
}
reference_type value() &
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access());
}
reference_type_of_temporary_wrapper value() &&
{
if (this->is_initialized())
return boost::move(this->get()) ;
else
throw_exception(bad_optional_access());
}
#else
reference_const_type value() const
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access());
}
reference_type value()
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access());
}
#endif
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
template <class U>
value_type value_or ( U&& v ) const&
{
if (this->is_initialized())
return get();
else
return boost::forward<U>(v);
}
template <class U>
value_type value_or ( U&& v ) &&
{
if (this->is_initialized())
return boost::move(get());
else
return boost::forward<U>(v);
}
#elif !defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template <class U>
value_type value_or ( U&& v ) const
{
if (this->is_initialized())
return get();
else
return boost::forward<U>(v);
}
#else
template <class U>
value_type value_or ( U const& v ) const
{
if (this->is_initialized())
return get();
else
return v;
}
template <class U>
value_type value_or ( U& v ) const
{
if (this->is_initialized())
return get();
else
return v;
}
#endif
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
template <typename F>
value_type value_or_eval ( F f ) const&
{
if (this->is_initialized())
return get();
else
return f();
}
template <typename F>
value_type value_or_eval ( F f ) &&
{
if (this->is_initialized())
return boost::move(get());
else
return f();
}
#else
template <typename F>
value_type value_or_eval ( F f ) const
{
if (this->is_initialized())
return get();
else
return f();
}
#endif
bool operator!() const BOOST_NOEXCEPT { return !this->is_initialized() ; }
BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
} ;
} // namespace boost
#endif // BOOST_OPTIONAL_CONFIG_USE_OLD_IMPLEMENTATION_OF_OPTIONAL
namespace boost {
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template<class T>
class optional<T&&>
{
BOOST_STATIC_ASSERT_MSG(sizeof(T) == 0, "Optional rvalue references are illegal.");
} ;
#endif
} // namespace boost
#ifndef BOOST_OPTIONAL_CONFIG_DONT_SPECIALIZE_OPTIONAL_REFS
# include <boost/optional/detail/optional_reference_spec.hpp>
#endif
namespace boost {
// Returns optional<T>(v)
template<class T>
inline
optional<T> make_optional ( T const& v )
{
return optional<T>(v);
}
// Returns optional<T>(cond,v)
template<class T>
inline
optional<T> make_optional ( bool cond, T const& v )
{
return optional<T>(cond,v);
}
// Returns a reference to the value if this is initialized, otherwise, the behaviour is UNDEFINED.
// No-throw
template<class T>
inline
BOOST_DEDUCED_TYPENAME optional<T>::reference_const_type
get ( optional<T> const& opt )
{
return opt.get() ;
}
template<class T>
inline
BOOST_DEDUCED_TYPENAME optional<T>::reference_type
get ( optional<T>& opt )
{
return opt.get() ;
}
// Returns a pointer to the value if this is initialized, otherwise, returns NULL.
// No-throw
template<class T>
inline
BOOST_DEDUCED_TYPENAME optional<T>::pointer_const_type
get ( optional<T> const* opt )
{
return opt->get_ptr() ;
}
template<class T>
inline
BOOST_DEDUCED_TYPENAME optional<T>::pointer_type
get ( optional<T>* opt )
{
return opt->get_ptr() ;
}
// Returns a reference to the value if this is initialized, otherwise, the behaviour is UNDEFINED.
// No-throw
template<class T>
inline
BOOST_DEDUCED_TYPENAME optional<T>::reference_const_type
get_optional_value_or ( optional<T> const& opt, BOOST_DEDUCED_TYPENAME optional<T>::reference_const_type v )
{
return opt.get_value_or(v) ;
}
template<class T>
inline
BOOST_DEDUCED_TYPENAME optional<T>::reference_type
get_optional_value_or ( optional<T>& opt, BOOST_DEDUCED_TYPENAME optional<T>::reference_type v )
{
return opt.get_value_or(v) ;
}
// Returns a pointer to the value if this is initialized, otherwise, returns NULL.
// No-throw
template<class T>
inline
BOOST_DEDUCED_TYPENAME optional<T>::pointer_const_type
get_pointer ( optional<T> const& opt )
{
return opt.get_ptr() ;
}
template<class T>
inline
BOOST_DEDUCED_TYPENAME optional<T>::pointer_type
get_pointer ( optional<T>& opt )
{
return opt.get_ptr() ;
}
} // namespace boost
namespace boost {
// The following declaration prevents a bug where operator safe-bool is used upon streaming optional object if you forget the IO header.
template<class CharType, class CharTrait>
std::basic_ostream<CharType, CharTrait>&
operator<<(std::basic_ostream<CharType, CharTrait>& os, optional_detail::optional_tag const&)
{
BOOST_STATIC_ASSERT_MSG(sizeof(CharType) == 0, "If you want to output boost::optional, include header <boost/optional/optional_io.hpp>");
return os;
}
} // namespace boost
#include <boost/optional/detail/optional_relops.hpp>
#include <boost/optional/detail/optional_swap.hpp>
#endif // header guard
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