boxes.hpp

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//==================================================================================================
/// \file
/// This header-file is part of module \alib_boxing of the \aliblong.
///
/// Copyright 2013-2026 A-Worx GmbH, Germany.
/// Published under #"mainpage_license".
//==================================================================================================
ALIB_EXPORT namespace alib { namespace boxing {
 
//==================================================================================================
/// A vector of objects of type #"Box".
/// Specializes class \c std::vector<Box> (publicly) with a constructor and methods to add a
/// variable number of arbitrary values with one invocation.
///
/// If another #"%Boxes" object or an array of boxes, or boxed versions of such, are added, this
/// container is "flattened", so that instead of the container, the boxes are added. Such flatting
/// is performed recursively.
///
/// \see
///   Chapter #"alib_boxing_boxes"
///   of the Programmer's Manual of module \alib_boxing.
///
/// @tparam TAllocator The allocator to use with the <c>std::vector</c>, as prototyped with class
///                    #"lang::Allocator".
//==================================================================================================
template<typename TAllocator>
class TBoxes : public    std::vector<Box, lang::StdAllocator<Box, TAllocator>> {
  protected:
    /// The base type.
    using vectorBase=   std::vector<Box, lang::StdAllocator<Box, TAllocator>>;
 
  public:
    /// The allocator type that \p{TAllocator} specifies.
    using AllocatorType=        TAllocator;
 
    /// Defaulted default constructor, usable only with heap allocation.
    TBoxes()                                                                                      {}
 
    ///  Constructor.
    ///  @param pAllocator The allocator to use.
    TBoxes(TAllocator& pAllocator)
    : vectorBase(pAllocator)                                                                      {}
 
 
    /// Deleted copy constructor.
    TBoxes( TBoxes& )                                                                       =delete;
 
    /// Deleted copy assignment operator.
    /// @return Nothing (deleted).
    TBoxes& operator=( TBoxes& )                                                            =delete;
 
    /// Empty method. Needed to allow adding empty variadic template parameter packs.
    /// @return A reference to this object.
    TBoxes& Add()                                                                  { return *this; }
 
    /// Adds one box for each given variadic argument.
    ///
    /// @tparam TBoxables The types of the variadic arguments.
    /// @param  args      The variadic arguments. Each argument is converted into one box to be
    ///                   appended.
    /// @return A reference to this object.
    template <typename... TBoxables>
    TBoxes& Add( TBoxables&&... args ) {
        Box boxes[sizeof...(args)]= { std::forward<TBoxables>( args )... };
        AddArray( boxes, sizeof...(args) );
 
        return *this;
    }
 
    /// Adds one boxt.
    ///
    /// @param  box The box to append.
    /// @return A reference to this object.
    TBoxes& Add(const Box& box ) {
        AddArray( &box, 1 );
 
        return *this;
    }
 
    /// Adds an array of boxes.
    ///
    /// @tparam TExtend  The size of the given array of boxes.
    /// @param  boxArray The array of boxes.
    /// @return A reference to this object.
    template<size_t TExtend>
    TBoxes& Add( const Box(& boxArray)[TExtend] )   { AddArray( boxArray, TExtend ); return *this; }
 
    /// Adds all elements of the given other #"%TBoxes" object.
    ///
    /// @param  boxes Another container of boxes to add.
    /// @return A reference to this object.
    template<typename TAllocatorArgs>
    TBoxes& Add( const TBoxes<TAllocatorArgs>& boxes )
    {
        AddArray( boxes.data(), integer(boxes.size()) );
        return *this;
    }
 
    /// Adds an array of boxes. Array elements of types #"%TBoxes" itself and boxed arrays of
    /// class #"%Box" are recursively "flattened".
    ///
    /// This method is internally used by all overloads of #".Add".
    ///
    /// @param boxArray Pointer to the start of the array of boxes.
    /// @param length   The number of boxes contained in \p{boxArray}.
    void        AddArray( const Box* boxArray, integer length );
 
 
    /// Inline operator that simply aliases method #".Add".
    ///
    /// @param src The value to be boxed and added.
    /// @return Returns a mutable reference to \c this.
    template <typename TBoxable>
    TBoxes& operator+=( TBoxable&& src )                                      { return Add( src ); }
 
    /// Inline operator that simply aliases method #".Add".
    ///
    /// @param src The value to be boxed and added.
    /// @return Returns a mutable reference to \c this.
    template <typename TBoxable>
    TBoxes& operator<<( TBoxable&& src )                                      { return Add( src ); }
 
    /// Returns the quantity of elements stored in ths container.
    /// @return The element count.
    integer Size()                                   const { return integer( vectorBase::size() ); }
 
    /// Invokes the corresponding parent's method \c std::vector::reserve.
    ///
    /// @param newCapacity The new, higher capacity of the vector.
    void    Reserve(integer newCapacity)           { vectorBase::reserve( size_t( newCapacity ) ); }
 
    /// Invokes #"Box::Call" with each box in this list.
    /// The result of the invocations of the box-functions is ignored.
    ///
    /// @tparam TFDecl  The function type to call.
    ///                 Needs to be specified with invocations of this method.
    /// @tparam TArgs   Types of the variadic arguments \p{args}.
    ///                 Do not need to be specified.
    /// @param  args    Variadic arguments forwarded to the functions.
    template <typename TFDecl,  typename... TArgs>
    void CallAll(TArgs&&... args)                                                            const {
        for( auto& box : *this )
            box.template Call<TFDecl>( std::forward<TArgs>(args)... );
    }
 
    /// Non-constant version of method #"CallAll", which likewise chooses the non-constant version
    /// of #"Box::Call" and hence this method is usable with functions that only
    /// accept mutable (aka not constant) boxes.<br>
    /// Technically, the only difference between this method and #"%CallAll" is that the latter
    /// is declared \c const.
    ///
    /// @tparam TFDecl  The function type to call.
    ///                 Needs to be specified with invocations of this method.
    /// @tparam TArgs   Types of the variadic arguments \p{args} .
    /// @param  args    Variadic arguments forwarded to the functions.
    template <typename TFDecl,  typename... TArgs>
    void CallAll(TArgs&&... args)
    {
        for( auto& box : *this )
            box.template Call<TFDecl>( std::forward<TArgs>(args)... );
    }
 
    /// Same as #"CallAll;CallAll<FClone>", but uses method #"Box::Clone",
    /// which internally invokes #"FClone".
    ///
    /// Using this version leads to shorter code, because method #"%Box::Clone" is not inlined.
    /// Cloning is performed 'into' the allocator used by the #"%Boxes" instance.
    ///
    /// \par Availability
    ///   This method is available only if the module \alib_monomem is included in the \alibbuild.
    void CloneAll()
    {
        for( auto& box : *this )
            box.Clone( vectorBase::get_allocator().GetAllocator() );
    }
 
}; // class TBoxes
 
 
extern template ALIB_DLL  void TBoxes<lang::HeapAllocator>::AddArray( const Box* boxArray, integer length );
#if ALIB_MONOMEM
extern template ALIB_DLL  void TBoxes<MonoAllocator      >::AddArray( const Box* boxArray, integer length );
#endif
 
} // namespace alib[::boxing]
 
/// Type alias in namespace #"%alib".
using     Boxes= boxing::TBoxes<lang::HeapAllocator>;
 
#if ALIB_MONOMEM
/// Type alias in namespace #"%alib".
using     BoxesMA= boxing::TBoxes<MonoAllocator>;
 
/// Type alias in namespace #"%alib".
using     BoxesPA= boxing::TBoxes<PoolAllocator>;
#endif
 
 
} // namespace [alib]::boxing
 
ALIB_BOXING_VTABLE_DECLARE( alib::boxing::TBoxes<HeapAllocator>*, vt_boxing_tboxes )