include/opencascade/NCollection_Shared.hxx

0001 // Created on: 2015-06-26
0002 // Created by: Andrey Betenev
0003 // Copyright (c) 2015 OPEN CASCADE SAS
0004 //
0005 // This file is part of Open CASCADE Technology software library.
0006 //
0007 // This library is free software; you can redistribute it and/or modify it under
0008 // the terms of the GNU Lesser General Public License version 2.1 as published
0009 // by the Free Software Foundation, with special exception defined in the file
0010 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0011 // distribution for complete text of the license and disclaimer of any warranty.
0012 //
0013 // Alternatively, this file may be used under the terms of Open CASCADE
0014 // commercial license or contractual agreement.
0015
0016 #ifndef NCollection_Shared_HeaderFile
0017 #define NCollection_Shared_HeaderFile
0018
0019 #include <NCollection_DefineAlloc.hxx>
0020
0021 //! Template defining a class derived from the specified base class and
0022 //! Standard_Transient, and supporting OCCT RTTI.
0023 //!
0024 //! This provides possibility to use Handes for types not initially intended
0025 //! to be dynamically allocated.
0026 //!
0027 //! Current limitation is that only copy and constructors with 1-3 arguments are defined,
0028 //! calling those of the argument class (default constructor must be available).
0029 //! It can be improved when perfect forwarding of template arguments is supported
0030 //! by all compilers used for OCCT.
0031 //!
0032 //! The intent is similar to std::make_shared<> in STL, except that this
0033 //! implementation defines a separate type.
0034
0035 template <class T,
0036           typename = typename opencascade::std::enable_if<
0037             !opencascade::std::is_base_of<Standard_Transient, T>::value>::type>
0038 class NCollection_Shared : public Standard_Transient, public T
0039 {
0040 public:
0041   DEFINE_STANDARD_ALLOC
0042   DEFINE_NCOLLECTION_ALLOC
0043
0044   //! Default constructor
0045   NCollection_Shared() = default;
0046
0047   //! Constructor with single argument
0048   template <typename T1>
0049   NCollection_Shared(const T1& arg1)
0050       : T(arg1)
0051   {
0052   }
0053
0054   //! Constructor with single argument
0055   template <typename T1>
0056   NCollection_Shared(T1& arg1)
0057       : T(arg1)
0058   {
0059   }
0060
0061   //! Constructor with two arguments
0062   template <typename T1, typename T2>
0063   NCollection_Shared(const T1& arg1, const T2& arg2)
0064       : T(arg1, arg2)
0065   {
0066   }
0067
0068   //! Constructor with two arguments
0069   template <typename T1, typename T2>
0070   NCollection_Shared(T1& arg1, const T2& arg2)
0071       : T(arg1, arg2)
0072   {
0073   }
0074
0075   //! Constructor with two arguments
0076   template <typename T1, typename T2>
0077   NCollection_Shared(const T1& arg1, T2& arg2)
0078       : T(arg1, arg2)
0079   {
0080   }
0081
0082   //! Constructor with two arguments
0083   template <typename T1, typename T2>
0084   NCollection_Shared(T1& arg1, T2& arg2)
0085       : T(arg1, arg2)
0086   {
0087   }
0088
0089   /* this could work...
0090     //! Forwarding constructor
0091     template<typename... Args>
0092     NCollection_Shared (Args&&... args)
0093     : T (std::forward<Args>(args)...)
0094     {}
0095   */
0096 };
0097
0098 #endif