webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 128 insertions, 0 deletions

diff --git a/Source/WTF/wtf/glib/GUniquePtr.h b/Source/WTF/wtf/glib/GUniquePtr.h
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index 000000000..e1cff8dde
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+++ b/Source/WTF/wtf/glib/GUniquePtr.h
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+/*
+ *  Copyright (C) 2014 Igalia S.L.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef GUniquePtr_h
+#define GUniquePtr_h
+
+#if USE(GLIB)
+
+#include <gio/gio.h>
+#include <wtf/Noncopyable.h>
+
+namespace WTF {
+
+template<typename T>
+struct GPtrDeleter {
+    void operator()(T* ptr) const { g_free(ptr); }
+};
+
+template<typename T>
+using GUniquePtr = std::unique_ptr<T, GPtrDeleter<T>>;
+
+#define FOR_EACH_GLIB_DELETER(macro) \
+    macro(GError, g_error_free) \
+    macro(GList, g_list_free) \
+    macro(GSList, g_slist_free) \
+    macro(GPatternSpec, g_pattern_spec_free) \
+    macro(GDir, g_dir_close) \
+    macro(GTimer, g_timer_destroy) \
+    macro(GKeyFile, g_key_file_free) \
+    macro(char*, g_strfreev) \
+    macro(GVariantIter, g_variant_iter_free)
+
+#define WTF_DEFINE_GPTR_DELETER(typeName, deleterFunc) \
+    template<> struct GPtrDeleter<typeName> \
+    { \
+        void operator() (typeName* ptr) const \
+        { \
+            deleterFunc(ptr); \
+        } \
+    };
+
+FOR_EACH_GLIB_DELETER(WTF_DEFINE_GPTR_DELETER)
+#undef FOR_EACH_GLIB_DELETER
+
+template <typename T> class GUniqueOutPtr {
+    WTF_MAKE_NONCOPYABLE(GUniqueOutPtr);
+public:
+    GUniqueOutPtr()
+        : m_ptr(nullptr)
+    {
+    }
+
+    ~GUniqueOutPtr()
+    {
+        reset();
+    }
+
+    T*& outPtr()
+    {
+        reset();
+        return m_ptr;
+    }
+
+    GUniquePtr<T> release()
+    {
+        GUniquePtr<T> ptr(m_ptr);
+        m_ptr = nullptr;
+        return ptr;
+    }
+
+    T& operator*() const
+    {
+        ASSERT(m_ptr);
+        return *m_ptr;
+    }
+
+    T* operator->() const
+    {
+        ASSERT(m_ptr);
+        return m_ptr;
+    }
+
+    T* get() const { return m_ptr; }
+
+    bool operator!() const { return !m_ptr; }
+
+    // This conversion operator allows implicit conversion to bool but not to other integer types.
+    typedef T* GUniqueOutPtr::*UnspecifiedBoolType;
+    operator UnspecifiedBoolType() const { return m_ptr ? &GUniqueOutPtr::m_ptr : 0; }
+
+private:
+    void reset()
+    {
+        if (m_ptr) {
+            GUniquePtr<T> deletePtr(m_ptr);
+            m_ptr = nullptr;
+        }
+    }
+
+    T* m_ptr;
+};
+
+} // namespace WTF
+
+using WTF::GUniquePtr;
+using WTF::GUniqueOutPtr;
+
+#endif // USE(GLIB)
+
+#endif // GUniquePtr_h
+