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 // Copyright (C) 2017 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:
 //  akrzemi1@gmail.com
 
 // trivially-copyable version of the storage
 
 template<class T>
 class tc_optional_base : public optional_tag
 {
   private :
 
     typedef tc_optional_base<T> this_type ;
 
   protected :
 
     typedef T value_type ;
 
   protected:
     typedef T &       reference_type ;
     typedef T const&  reference_const_type ;
     typedef T &&  rval_reference_type ;
     typedef T &&  reference_type_of_temporary_wrapper ;
     typedef T *         pointer_type ;
     typedef T const*    pointer_const_type ;
     typedef T const&    argument_type ;
 
     tc_optional_base()
       :
       m_initialized(false), m_storage() {}
 
     tc_optional_base ( none_t )
       :
       m_initialized(false), m_storage() {}
 
     tc_optional_base ( init_value_tag, argument_type val )
       :
       m_initialized(true), m_storage(val) {}
 
     tc_optional_base ( bool cond, argument_type val )
       :
       m_initialized(cond), m_storage(val) {}
 
     // tc_optional_base ( tc_optional_base const& ) = default;
 
     template<class Expr, class PtrExpr>
     explicit tc_optional_base ( Expr&& expr, PtrExpr const* tag )
       :
       m_initialized(false)
     {
       construct(optional_detail::forward<Expr>(expr),tag);
     }
 
     // tc_optional_base& operator= ( tc_optional_base const& ) = default;
     // ~tc_optional_base() = default;
 
     // Assigns from another optional<T> (deep-copies the rhs value)
     void assign ( tc_optional_base const& rhs )
     {
       *this = rhs;
     }
 
     // Assigns from another _convertible_ optional<U> (deep-copies the rhs value)
     template<class U>
     void assign ( optional<U> const& rhs )
     {
       if ( rhs.is_initialized() )
 #ifndef BOOST_OPTIONAL_CONFIG_RESTORE_ASSIGNMENT_OF_NONCONVERTIBLE_TYPES
         m_storage = rhs.get();
 #else
         m_storage = static_cast<value_type>(rhs.get());
 #endif
 
       m_initialized = rhs.is_initialized();
     }
 
     // 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 ( rhs.is_initialized() )
         m_storage = static_cast<ref_type>(rhs.get());
       m_initialized = rhs.is_initialized();
     }
 
     void assign ( argument_type val )
     {
       construct(val);
     }
 
     void assign ( none_t ) { destroy(); }
 
 #ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
 
     template<class Expr, class ExprPtr>
     void assign_expr ( Expr&& expr, ExprPtr const* tag )
     {
        construct(optional_detail::forward<Expr>(expr),tag);
     }
 
 #endif
 
   public :
 
     // Destroys the current value, if any, leaving this UNINITIALIZED
     // No-throw (assuming T::~T() doesn't)
     void reset() BOOST_NOEXCEPT { destroy(); }
 
     // **DEPRECATED** Replaces the current value -if any- with 'val'
     void reset ( argument_type val ) BOOST_NOEXCEPT { 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 )
      {
        m_storage = val ;
        m_initialized = true ;
      }
 
 
     // Constructs in-place
     // upon exception *this is always uninitialized
     template<class... Args>
     void construct ( in_place_init_t, Args&&... args )
     {
       m_storage = value_type( optional_detail::forward<Args>(args)... ) ;
       m_initialized = true ;
     }
 
     template<class... Args>
     void emplace_assign ( Args&&... args )
     {
       construct(in_place_init, optional_detail::forward<Args>(args)...);
     }
 
     template<class... Args>
     explicit tc_optional_base ( in_place_init_t, Args&&... args )
       :
       m_initialized(false)
     {
       construct(in_place_init, optional_detail::forward<Args>(args)...);
     }
 
     template<class... Args>
     explicit tc_optional_base ( in_place_init_if_t, bool cond, Args&&... args )
       :
       m_initialized(false)
     {
       if ( cond )
         construct(in_place_init, optional_detail::forward<Args>(args)...);
     }
 
 #ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
 
     // 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, boost::addressof(m_storage));
        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(boost::addressof(m_storage)) ;
        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);
      }
 
 #endif
 
     // 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* )
     {
       m_storage = value_type(optional_detail::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( optional_detail::forward<Expr>(expr) );
     }
 
 #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 doesn't work because the compiler issues and error
     // instead of choosing the wrong overload
     //
 
     // Notice that 'Expr' will be optional<T> or optional<U> (but not tc_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.
          m_storage = value_type(optional_detail::move(expr.get())) ;
          m_initialized = true ;
        }
      }
 #endif // defined BOOST_OPTIONAL_WEAK_OVERLOAD_RESOLUTION
 
     void assign_value ( argument_type val ) { m_storage = val; }
     void assign_value ( rval_reference_type val ) { m_storage = static_cast<rval_reference_type>(val); }
 
     void destroy()
     {
       m_initialized = false;
     }
 
     reference_const_type get_impl() const { return m_storage ; }
     reference_type       get_impl()       { return m_storage ; }
 
     pointer_const_type get_ptr_impl() const { return boost::addressof(m_storage); }
     pointer_type       get_ptr_impl()       { return boost::addressof(m_storage); }
 
   private :
 
     bool m_initialized ;
     T    m_storage ;
 } ;

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