X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/153107b4021fe0e6c3ad2ed510d3225f138eee83..58ce18f2fdadecffb21e27555115af708325cf18:/include/wx/any.h

diff --git a/include/wx/any.h b/include/wx/any.h
index 64930ef66b..092e71078d 100644
--- a/include/wx/any.h
+++ b/include/wx/any.h
@@ -16,8 +16,8 @@
 
 #if wxUSE_ANY
 
+#include <new> // for placement new
 #include "wx/string.h"
-#include "wx/meta/movable.h"
 #include "wx/meta/if.h"
 #include "wx/typeinfo.h"
 
@@ -56,7 +56,9 @@ public:
     /**
         Default constructor.
     */
-    wxAnyValueType();
+    wxAnyValueType()
+    {
+    }
 
     /**
         Destructor.
@@ -110,10 +112,30 @@ public:
     */
     // FIXME-VC6: remove this hack when VC6 is no longer supported
     template <typename T>
-    bool CheckType(T* reserved = NULL);
+    bool CheckType(T* reserved = NULL) const;
 private:
 };
 
+
+//
+// We need to allocate wxAnyValueType instances in heap, and need to use
+// scoped ptr to properly deallocate them in dynamic library use cases.
+// Here we have a minimal specialized scoped ptr implementation to deal
+// with various compiler-specific problems with template class' static
+// member variable of template type with explicit constructor which
+// is initialized in global scope.
+//
+class wxAnyValueTypeScopedPtr
+{
+public:
+    wxAnyValueTypeScopedPtr(wxAnyValueType* ptr) : m_ptr(ptr) { }
+    ~wxAnyValueTypeScopedPtr() { delete m_ptr; }
+    wxAnyValueType* get() const { return m_ptr; }
+private:
+    wxAnyValueType* m_ptr;
+};
+
+
 //
 // This method of checking the type is compatible with VC6
 #define wxANY_VALUE_TYPE_CHECK_TYPE(valueTypePtr, T) \
@@ -127,6 +149,11 @@ private:
     facilitate sub-type system which allows, for instance, wxAny with
     signed short '15' to be treated equal to wxAny with signed long long '15'.
     Having sm_instance is important here.
+
+    NB: We really need to have wxAnyValueType instances allocated
+        in heap. They are stored as static template member variables,
+        and with them we just can't be too careful (eg. not allocating
+        them in heap broke the type identification in GCC).
 */
 #define WX_DECLARE_ANY_VALUE_TYPE(CLS) \
     friend class wxAny; \
@@ -134,23 +161,23 @@ private:
 public: \
     static bool IsSameClass(const wxAnyValueType* otherType) \
     { \
-        return wxTypeId(*sm_instance) == wxTypeId(*otherType); \
+        return wxTypeId(*sm_instance.get()) == wxTypeId(*otherType); \
     } \
     virtual bool IsSameType(const wxAnyValueType* otherType) const \
     { \
         return IsSameClass(otherType); \
     } \
 private: \
-    static CLS* sm_instance; \
+    static wxAnyValueTypeScopedPtr sm_instance; \
 public: \
     static wxAnyValueType* GetInstance() \
     { \
-        return sm_instance; \
+        return sm_instance.get(); \
     }
 
 
 #define WX_IMPLEMENT_ANY_VALUE_TYPE(CLS) \
-    CLS* CLS::sm_instance = new CLS();
+wxAnyValueTypeScopedPtr CLS::sm_instance(new CLS());
 
 
 #ifdef __VISUALC6__
@@ -166,18 +193,24 @@ namespace wxPrivate
 {
 
 template<typename T>
-class wxAnyValueTypeOpsMovable
+class wxAnyValueTypeOpsInplace
 {
 public:
     static void DeleteValue(wxAnyValueBuffer& buf)
     {
-        wxUnusedVar(buf);
+        T* value = reinterpret_cast<T*>(&buf.m_buffer[0]);
+        value->~T();
+
+        // Some compiler may given 'unused variable' warnings without this
+        wxUnusedVar(value);
     }
 
     static void SetValue(const T& value,
                          wxAnyValueBuffer& buf)
     {
-        memcpy(buf.m_buffer, &value, sizeof(T));
+        // Use placement new
+        void* const place = buf.m_buffer;
+        ::new(place) T(value);
     }
 
     static const T& GetValue(const wxAnyValueBuffer& buf)
@@ -243,9 +276,8 @@ public:
 template<typename T>
 class wxAnyValueTypeImplBase : public wxAnyValueType
 {
-    typedef typename wxIf< wxIsMovable<T>::value &&
-                                sizeof(T) <= WX_ANY_VALUE_BUFFER_SIZE,
-                           wxPrivate::wxAnyValueTypeOpsMovable<T>,
+    typedef typename wxIf< sizeof(T) <= WX_ANY_VALUE_BUFFER_SIZE,
+                           wxPrivate::wxAnyValueTypeOpsInplace<T>,
                            wxPrivate::wxAnyValueTypeOpsGeneric<T> >::value
             Ops;
 
@@ -309,8 +341,7 @@ public:
 };
 
 template<typename T>
-wxAnyValueTypeImpl<T>* wxAnyValueTypeImpl<T>::sm_instance =
-    new wxAnyValueTypeImpl<T>();
+wxAnyValueTypeScopedPtr wxAnyValueTypeImpl<T>::sm_instance = new wxAnyValueTypeImpl<T>();
 
 
 //
@@ -702,19 +733,19 @@ public:
     template<typename T>
     wxAny(const T& value)
     {
-        m_type = wxAnyValueTypeImpl<T>::sm_instance;
+        m_type = wxAnyValueTypeImpl<T>::sm_instance.get();
         wxAnyValueTypeImpl<T>::SetValue(value, m_buffer);
     }
 
     // These two constructors are needed to deal with string literals
     wxAny(const char* value)
     {
-        m_type = wxAnyValueTypeImpl<const char*>::sm_instance;
+        m_type = wxAnyValueTypeImpl<const char*>::sm_instance.get();
         wxAnyValueTypeImpl<const char*>::SetValue(value, m_buffer);
     }
     wxAny(const wchar_t* value)
     {
-        m_type = wxAnyValueTypeImpl<const wchar_t*>::sm_instance;
+        m_type = wxAnyValueTypeImpl<const wchar_t*>::sm_instance.get();
         wxAnyValueTypeImpl<const wchar_t*>::SetValue(value, m_buffer);
     }
 
@@ -746,7 +777,7 @@ public:
     */
     // FIXME-VC6: remove this hack when VC6 is no longer supported
     template <typename T>
-    bool CheckType(T* = NULL)
+    bool CheckType(T* = NULL) const
     {
         return m_type->CheckType<T>();
     }
@@ -756,8 +787,9 @@ public:
 
         @remarks You cannot reliably test whether two wxAnys are of
                  same value type by simply comparing return values
-                 of wxAny::GetType(). Instead use
-                 wxAnyValueType::CheckType<T>() template function.
+                 of wxAny::GetType(). Instead, use wxAny::HasSameType().
+
+        @see HasSameType()
     */
     const wxAnyValueType* GetType() const
     {
@@ -765,7 +797,16 @@ public:
     }
 
     /**
-        Tests if wxAny is null (that is, whether there is data).
+        Returns @true if this and another wxAny have the same
+        value type.
+    */
+    bool HasSameType(const wxAny& other) const
+    {
+        return GetType()->IsSameType(other.GetType());
+    }
+
+    /**
+        Tests if wxAny is null (that is, whether there is no data).
     */
     bool IsNull() const
     {
@@ -789,7 +830,7 @@ public:
     wxAny& operator=(const T &value)
     {
         m_type->DeleteValue(m_buffer);
-        m_type = wxAnyValueTypeImpl<T>::sm_instance;
+        m_type = wxAnyValueTypeImpl<T>::sm_instance.get();
         wxAnyValueTypeImpl<T>::SetValue(value, m_buffer);
         return *this;
     }
@@ -938,7 +979,7 @@ public:
         if ( !wxAnyValueTypeImpl<T>::IsSameClass(m_type) )
         {
             wxAnyValueType* otherType =
-                wxAnyValueTypeImpl<T>::sm_instance;
+                wxAnyValueTypeImpl<T>::sm_instance.get();
             wxAnyValueBuffer temp_buf;
 
             if ( !m_type->ConvertValue(m_buffer, otherType, temp_buf) )
@@ -995,7 +1036,7 @@ private:
         else
         {
             // If everything else fails, wrap the whole wxVariantData
-            m_type = wxAnyValueTypeImpl<wxVariantData*>::sm_instance;
+            m_type = wxAnyValueTypeImpl<wxVariantData*>::sm_instance.get();
             wxAnyValueTypeImpl<wxVariantData*>::SetValue(data, m_buffer);
         }
     }
@@ -1005,7 +1046,7 @@ private:
     void Assign(const T &value)
     {
         m_type->DeleteValue(m_buffer);
-        m_type = wxAnyValueTypeImpl<T>::sm_instance;
+        m_type = wxAnyValueTypeImpl<T>::sm_instance.get();
         wxAnyValueTypeImpl<T>::SetValue(value, m_buffer);
     }
 
@@ -1018,17 +1059,17 @@ private:
 //
 // This method of checking the type is compatible with VC6
 #define wxANY_CHECK_TYPE(any, T) \
-    wxANY_VALUE_TYPE_CHECK_TYPE(any.GetType(), T)
+    wxANY_VALUE_TYPE_CHECK_TYPE((any).GetType(), T)
 
 
 //
 // This method of getting the value is compatible with VC6
 #define wxANY_AS(any, T) \
-    any.As(static_cast<T*>(NULL))
+    (any).As(static_cast<T*>(NULL))
 
 
 template<typename T>
-inline bool wxAnyValueType::CheckType(T* reserved)
+inline bool wxAnyValueType::CheckType(T* reserved) const
 {
     wxUnusedVar(reserved);
     return wxAnyValueTypeImpl<T>::IsSameClass(this);