src/wx/wx_ptr.h

   1 /*
   2     Copyright (C) 2023 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21
  22 #ifndef DCPOMATIC_WX_PTR_H
  23 #define DCPOMATIC_WX_PTR_H
  24
  25
  26 #include "lib/dcpomatic_assert.h"
  27 #include <utility>
  28
  29
  30 template <class T>
  31 class wx_ptr
  32 {
  33 public:
  34         wx_ptr() {}
  35
  36         explicit wx_ptr(T* wx)
  37                 : _wx(wx)
  38         {}
  39
  40         wx_ptr(wx_ptr&) = delete;
  41         wx_ptr& operator=(wx_ptr&) = delete;
  42
  43         wx_ptr(wx_ptr&& other)
  44         {
  45                 _wx = other._wx;
  46                 other._wx = nullptr;
  47         }
  48
  49         wx_ptr& operator=(wx_ptr&& other)
  50         {
  51                 if (this != &other) {
  52                         _wx = other._wx;
  53                         other._wx = nullptr;
  54                 }
  55                 return *this;
  56         }
  57
  58         ~wx_ptr()
  59         {
  60                 if (_wx) {
  61                         _wx->Destroy();
  62                 }
  63         }
  64
  65         wx_ptr& operator=(T* ptr)
  66         {
  67                 if (_wx) {
  68                         _wx->Destroy();
  69                 }
  70                 _wx = ptr;
  71                 return *this;
  72         }
  73
  74         T* operator->()
  75         {
  76                 DCPOMATIC_ASSERT(_wx);
  77                 return _wx;
  78         }
  79
  80         operator bool() const
  81         {
  82                 return _wx != nullptr;
  83         }
  84
  85         void reset()
  86         {
  87                 if (_wx) {
  88                         _wx->Destroy();
  89                         _wx = nullptr;
  90                 }
  91         }
  92
  93         template <typename... Args>
  94         void reset(Args&&... args)
  95         {
  96                 if (_wx) {
  97                         _wx->Destroy();
  98                         _wx = nullptr;
  99                 }
 100                 _wx = new T(std::forward<Args>(args)...);
 101         }
 102
 103 private:
 104         T* _wx = nullptr;
 105 };
 106
 107
 108
 109 template <class T, typename... Args>
 110 wx_ptr<T>
 111 make_wx(Args... args)
 112 {
 113         return wx_ptr<T>(new T(std::forward<Args>(args)...));
 114 }
 115
 116
 117 #endif