1/* 2 * Copyright (C) 2014 Igalia S.L. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 * 19 */ 20 21#ifndef GUniquePtr_h 22#define GUniquePtr_h 23 24#if USE(GLIB) 25 26#include <gio/gio.h> 27#include <wtf/Noncopyable.h> 28 29namespace WTF { 30 31template<typename T> 32struct GPtrDeleter { 33 void operator()(T* ptr) const { g_free(ptr); } 34}; 35 36template<typename T> 37using GUniquePtr = std::unique_ptr<T, GPtrDeleter<T>>; 38 39#define FOR_EACH_GLIB_DELETER(macro) \ 40 macro(GError, g_error_free) \ 41 macro(GList, g_list_free) \ 42 macro(GSList, g_slist_free) \ 43 macro(GPatternSpec, g_pattern_spec_free) \ 44 macro(GDir, g_dir_close) \ 45 macro(GTimer, g_timer_destroy) \ 46 macro(GKeyFile, g_key_file_free) 47 48#define WTF_DEFINE_GPTR_DELETER(typeName, deleterFunc) \ 49 template<> struct GPtrDeleter<typeName> \ 50 { \ 51 void operator() (typeName* ptr) const \ 52 { \ 53 if (ptr) \ 54 deleterFunc(ptr); \ 55 } \ 56 }; 57 58FOR_EACH_GLIB_DELETER(WTF_DEFINE_GPTR_DELETER) 59#undef FOR_EACH_GLIB_DELETER 60 61template <typename T> class GUniqueOutPtr { 62 WTF_MAKE_NONCOPYABLE(GUniqueOutPtr); 63public: 64 GUniqueOutPtr() 65 : m_ptr(nullptr) 66 { 67 } 68 69 ~GUniqueOutPtr() 70 { 71 reset(); 72 } 73 74 T*& outPtr() 75 { 76 reset(); 77 return m_ptr; 78 } 79 80 GUniquePtr<T> release() 81 { 82 GUniquePtr<T> ptr(m_ptr); 83 m_ptr = nullptr; 84 return ptr; 85 } 86 87 T& operator*() const 88 { 89 ASSERT(m_ptr); 90 return *m_ptr; 91 } 92 93 T* operator->() const 94 { 95 ASSERT(m_ptr); 96 return m_ptr; 97 } 98 99 T* get() const { return m_ptr; } 100 101 bool operator!() const { return !m_ptr; } 102 103 // This conversion operator allows implicit conversion to bool but not to other integer types. 104 typedef T* GUniqueOutPtr::*UnspecifiedBoolType; 105 operator UnspecifiedBoolType() const { return m_ptr ? &GUniqueOutPtr::m_ptr : 0; } 106 107private: 108 void reset() 109 { 110 if (m_ptr) { 111 GUniquePtr<T> deletePtr(m_ptr); 112 m_ptr = nullptr; 113 } 114 } 115 116 T* m_ptr; 117}; 118 119} // namespace WTF 120 121using WTF::GUniquePtr; 122using WTF::GUniqueOutPtr; 123 124#endif // USE(GLIB) 125 126#endif // GUniquePtr_h 127 128