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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/optional/optional.hpp')
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diff --git a/src/third_party/boost-1.69.0/boost/optional/optional.hpp b/src/third_party/boost-1.69.0/boost/optional/optional.hpp new file mode 100644 index 00000000000..90acd40a172 --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/optional/optional.hpp @@ -0,0 +1,1600 @@ +// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal. +// Copyright (C) 2014 - 2018 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> + +#ifdef BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS +# include <type_traits> +#endif + +#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_const.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/type_traits/is_volatile.hpp> +#include <boost/type_traits/is_scalar.hpp> +#include <boost/move/utility.hpp> +#include <boost/none.hpp> +#include <boost/utility/compare_pointees.hpp> +#include <boost/utility/result_of.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> + +namespace boost { namespace optional_detail { + +template <typename T> +struct optional_value_type +{ +}; + +template <typename T> +struct optional_value_type< ::boost::optional<T> > +{ + typedef T type; +}; + +}} // namespace boost::optional_detail + +#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 init_value_tag {}; + +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 ( init_value_tag, 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 ( init_value_tag, 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 uninitialized optional<T>. + // Can throw if T::T(T const&) does + optional_base ( bool cond, argument_type val ) + : + m_initialized(false) + { + if ( cond ) + construct(val); + } + +#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES + // Creates an optional<T> initialized with 'move(val)' IFF cond is true, otherwise creates an uninitialized optional<T>. + // Can throw if T::T(T &&) does + optional_base ( bool cond, rval_reference_type val ) + : + m_initialized(false) + { + if ( cond ) + construct(boost::move(val)); + } +#endif + + // 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 ) + BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value) + : + 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 + + optional_base& operator= ( optional_base const& rhs ) + { + this->assign(rhs); + return *this; + } + +#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES + optional_base& operator= ( optional_base && rhs ) + BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value && ::boost::is_nothrow_move_assignable<T>::value) + { + this->assign(static_cast<optional_base&&>(rhs)); + return *this; + } +#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 : + + // 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 BOOST_NOEXCEPT { 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, BOOST_TESTED_AT(1900)) + 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 ; +} ; + +#include <boost/optional/detail/optional_trivially_copyable_base.hpp> + +// 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 + +namespace optional_config { + +template <typename T> +struct optional_uses_direct_storage_for + : boost::conditional<(boost::is_scalar<T>::value && !boost::is_const<T>::value && !boost::is_volatile<T>::value) + , boost::true_type, boost::false_type>::type +{}; + +} // namespace optional_config + + +#ifndef BOOST_OPTIONAL_DETAIL_NO_DIRECT_STORAGE_SPEC +# define BOOST_OPTIONAL_BASE_TYPE(T) boost::conditional< optional_config::optional_uses_direct_storage_for<T>::value, \ + optional_detail::tc_optional_base<T>, \ + optional_detail::optional_base<T> \ + >::type +#else +# define BOOST_OPTIONAL_BASE_TYPE(T) optional_detail::optional_base<T> +#endif + +template<class T> +class optional + : public BOOST_OPTIONAL_BASE_TYPE(T) +{ + typedef typename BOOST_OPTIONAL_BASE_TYPE(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(optional_detail::init_value_tag(), 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(optional_detail::init_value_tag(), 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) {} + +#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES + /// Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialized optional. + // Can throw if T::T(T &&) does + optional ( bool cond, rval_reference_type val ) : base( cond, boost::forward<T>(val) ) + {} +#endif + + // 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 + ,BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_constructible<T, U const&>, bool>::type = true +#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 + ,BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_constructible<T, U>, bool>::type = true +#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>, bool>::type = true + ) + : 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 +#ifndef BOOST_OPTIONAL_DETAIL_NO_DEFAULTED_MOVE_FUNCTIONS + optional ( optional const& ) = default; +#else + optional ( optional const& rhs ) : base( static_cast<base const&>(rhs) ) {} +#endif + +#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES + // Creates a deep move of another optional<T> + // Can throw if T::T(T&&) does + +#ifndef BOOST_OPTIONAL_DETAIL_NO_DEFAULTED_MOVE_FUNCTIONS + optional ( optional && rhs ) = default; +#else + optional ( optional && rhs ) + BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value) + : base( boost::move(rhs) ) + {} +#endif + +#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) +#ifndef BOOST_OPTIONAL_DETAIL_NO_DEFAULTED_MOVE_FUNCTIONS + optional& operator= ( optional const& rhs ) = default; +#else + optional& operator= ( optional const& rhs ) + { + this->assign( static_cast<base const&>(rhs) ) ; + return *this ; + } +#endif + +#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES + // Assigns from another optional<T> (deep-moves the rhs value) +#ifndef BOOST_OPTIONAL_DETAIL_NO_DEFAULTED_MOVE_FUNCTIONS + optional& operator= ( optional && ) = default; +#else + 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 + +#endif // BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES + +#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 + + +#if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES) + 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(); + } + + template <typename F> + optional<typename boost::result_of<F(reference_type)>::type> map(F f) & + { + if (this->has_value()) + return f(get()); + else + return none; + } + + template <typename F> + optional<typename boost::result_of<F(reference_const_type)>::type> map(F f) const& + { + if (this->has_value()) + return f(get()); + else + return none; + } + + template <typename F> + optional<typename boost::result_of<F(reference_type_of_temporary_wrapper)>::type> map(F f) && + { + if (this->has_value()) + return f(boost::move(this->get())); + else + return none; + } + + template <typename F> + optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_type)>::type>::type> flat_map(F f) & + { + if (this->has_value()) + return f(get()); + else + return none; + } + + template <typename F> + optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_const_type)>::type>::type> flat_map(F f) const& + { + if (this->has_value()) + return f(get()); + else + return none; + } + + template <typename F> + optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_type_of_temporary_wrapper)>::type>::type> flat_map(F f) && + { + if (this->has_value()) + return f(boost::move(get())); + else + return none; + } + +#else + template <typename F> + value_type value_or_eval ( F f ) const + { + if (this->is_initialized()) + return get(); + else + return f(); + } + + template <typename F> + optional<typename boost::result_of<F(reference_type)>::type> map(F f) + { + if (this->has_value()) + return f(get()); + else + return none; + } + + template <typename F> + optional<typename boost::result_of<F(reference_const_type)>::type> map(F f) const + { + if (this->has_value()) + return f(get()); + else + return none; + } + + template <typename F> + optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_type)>::type>::type> flat_map(F f) + { + if (this->has_value()) + return f(get()); + else + return none; + } + + template <typename F> + optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_const_type)>::type>::type> flat_map(F f) const + { + if (this->has_value()) + return f(get()); + else + return none; + } + +#endif + + bool has_value() const BOOST_NOEXCEPT { return this->is_initialized() ; } + + 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 { + +#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES + +template<class T> +inline +optional<BOOST_DEDUCED_TYPENAME boost::decay<T>::type> make_optional ( T && v ) +{ + return optional<BOOST_DEDUCED_TYPENAME boost::decay<T>::type>(boost::forward<T>(v)); +} + +// Returns optional<T>(cond,v) +template<class T> +inline +optional<BOOST_DEDUCED_TYPENAME boost::decay<T>::type> make_optional ( bool cond, T && v ) +{ + return optional<BOOST_DEDUCED_TYPENAME boost::decay<T>::type>(cond,boost::forward<T>(v)); +} + +#else + +// 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); +} + +#endif // BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES + +// 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 |