include/svl/typedwhich.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9 #ifndef INCLUDED_SVL_TYPEDWHICH_HXX
  10 #define INCLUDED_SVL_TYPEDWHICH_HXX
  11
  12 #include <sal/config.h>
  13 #include <sal/types.h>
  14
  15 /**
  16  * A very thin wrapper around the sal_uInt16 WhichId whose purpose is mostly to carry type information,
  17  * so that we Put() and Get() the right subclasses of SfxPoolItem for each WhichId.
  18  */
  19 template <class T> class TypedWhichId final
  20 {
  21 public:
  22     explicit constexpr TypedWhichId(sal_uInt16 nWhich)
  23         : mnWhich(nWhich)
  24     {
  25     }
  26     constexpr operator sal_uInt16() const { return mnWhich; }
  27
  28 private:
  29     sal_uInt16 const mnWhich;
  30 };
  31
  32 template <class T> constexpr bool operator==(sal_uInt16 lhs, TypedWhichId<T> const& rhs)
  33 {
  34     return lhs == sal_uInt16(rhs);
  35 }
  36 template <class T> constexpr bool operator!=(sal_uInt16 lhs, TypedWhichId<T> const& rhs)
  37 {
  38     return lhs != sal_uInt16(rhs);
  39 }
  40 template <class T> constexpr bool operator==(TypedWhichId<T> const& lhs, sal_uInt16 rhs)
  41 {
  42     return sal_uInt16(lhs) == rhs;
  43 }
  44 template <class T> constexpr bool operator!=(TypedWhichId<T> const& lhs, sal_uInt16 rhs)
  45 {
  46     return sal_uInt16(lhs) != rhs;
  47 }
  48
  49 #endif // INCLUDED_SVL_TYPEDWHICH_HXX
  50
  51 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */