don't crash if (char*)c_str() is used twice in a row on the same string and both...

[wxWidgets.git] / include / wx / ptr_scpd.h

diff --git a/include/wx/ptr_scpd.h b/include/wx/ptr_scpd.h
index 785b03603e07652ae0108cd26d07678900082883..2ebb6a67322782e0f4fcc5cddb44f508b880d1f3 100644 (file)
--- a/include/wx/ptr_scpd.h
+++ b/include/wx/ptr_scpd.h
@@ -10,8 +10,8 @@
 /////////////////////////////////////////////////////////////////////////////
 
 //  This class closely follows the implementation of the boost
-//  library scoped_ptr and is an adaption for c++ macro's in 
-//  the wxWindows project. The original authors of the boost
+//  library scoped_ptr and is an adaption for c++ macro's in
+//  the wxWidgets project. The original authors of the boost
 //  scoped_ptr are given below with their respective copyrights.
 
 //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
@@ -39,19 +39,28 @@
    still force a semicolon after the macro
 */
 
+#ifdef __WATCOMC__
+    #define wxFOR_ONCE(name)              for(int name=0; name<1; name++)
+    #define wxPRE_NO_WARNING_SCOPE(name)  wxFOR_ONCE(wxMAKE_UNIQUE_NAME(name))
+    #define wxPOST_NO_WARNING_SCOPE(name)
+#else
+    #define wxPRE_NO_WARNING_SCOPE(name)  do
+    #define wxPOST_NO_WARNING_SCOPE(name) while ( wxFalse )
+#endif
+
 #define wxCHECKED_DELETE(ptr)                                                 \
-    do                                                                        \
+    wxPRE_NO_WARNING_SCOPE(scope_var1)                                        \
     {                                                                         \
         typedef char complete[sizeof(*ptr)];                                  \
         delete ptr;                                                           \
-    } while ( 0 )
+    } wxPOST_NO_WARNING_SCOPE(scope_var1)
 
 #define wxCHECKED_DELETE_ARRAY(ptr)                                           \
-    do                                                                        \
+    wxPRE_NO_WARNING_SCOPE(scope_var2)                                        \
     {                                                                         \
         typedef char complete[sizeof(*ptr)];                                  \
         delete [] ptr;                                                        \
-    } while ( 0 )
+    } wxPOST_NO_WARNING_SCOPE(scope_var2)
 
 /* These scoped pointers are *not* assignable and cannot be used
    within a container.  Look for wxDECLARE_SHARED_PTR for this
@@ -123,9 +132,17 @@ public:                             \
 #define wxDEFINE_SCOPED_PTR(T, name)\
 name::~name()                       \
 {                                   \
-    wxCHECKED_DELETE(m_ptr)      \
+    wxCHECKED_DELETE(m_ptr);        \
 }
 
+// this macro can be used for the most common case when you want to declare and
+// define the scoped pointer at the same time and want to use the standard
+// naming convention: auto pointer to Foo is called FooPtr
+#define wxDEFINE_SCOPED_PTR_TYPE(T)    \
+    wxDECLARE_SCOPED_PTR(T, T ## Ptr)  \
+    wxDEFINE_SCOPED_PTR(T, T ## Ptr)
+
+// the same but for arrays instead of simple pointers
 #define wxDECLARE_SCOPED_ARRAY(T, name)\
 class name                          \
 {                                   \
@@ -162,16 +179,44 @@ public:                             \
 };
 
 #define wxDEFINE_SCOPED_ARRAY(T, name)  \
-name::~name()                       \
-{                                   \
-    wxCHECKED_DELETE_ARRAY(m_ptr)  \
-}                                   \
-void name::reset(T * p){            \
-    if (m_ptr != p)                 \
-    {                               \
-       wxCHECKED_DELETE_ARRAY(m_ptr); \
-       m_ptr = p;                   \
-    }                               \
+name::~name()                           \
+{                                       \
+    wxCHECKED_DELETE_ARRAY(m_ptr);      \
+}                                       \
+void name::reset(T * p){                \
+    if (m_ptr != p)                     \
+    {                                   \
+       wxCHECKED_DELETE_ARRAY(m_ptr);   \
+       m_ptr = p;                       \
+    }                                   \
 }
 
-#endif
+// ----------------------------------------------------------------------------
+// "Tied" scoped pointer: same as normal one but also sets the value of
+//                        some other variable to the pointer value
+// ----------------------------------------------------------------------------
+
+#define wxDEFINE_TIED_SCOPED_PTR_TYPE(T)                                      \
+    wxDEFINE_SCOPED_PTR_TYPE(T)                                               \
+    class T ## TiedPtr : public T ## Ptr                                      \
+    {                                                                         \
+    public:                                                                   \
+        T ## TiedPtr(T **pp, T *p)                                            \
+            : T ## Ptr(p), m_pp(pp)                                           \
+        {                                                                     \
+            m_pOld = *pp;                                                     \
+            *pp = p;                                                          \
+        }                                                                     \
+                                                                              \
+        ~ T ## TiedPtr()                                                      \
+        {                                                                     \
+            *m_pp = m_pOld;                                                   \
+        }                                                                     \
+                                                                              \
+    private:                                                                  \
+        T **m_pp;                                                             \
+        T *m_pOld;                                                            \
+    };
+
+#endif // __WX_SCOPED_POINTER__
+