friend declarations are not injected in the enclosing scope by conforming compilers...

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36384 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/include/wx/string.h b/include/wx/string.h
index 01f053d807bb8b76fed16c770e00506e008dfde6..ac55f5c5f968f694d2bfdc77b39a9b8f9e0cdc14 100644 (file)
--- a/include/wx/string.h
+++ b/include/wx/string.h
@@ -934,16 +934,19 @@ public:
     { *this = str + *this; return *this; }
 
     // non-destructive concatenation
     { *this = str + *this; return *this; }
 
     // non-destructive concatenation

-      //
-  friend wxString WXDLLIMPEXP_BASE operator+(const wxString& string1,  const wxString& string2);
-      //
+      // two strings
+  friend wxString WXDLLIMPEXP_BASE operator+(const wxString& string1,
+                                             const wxString& string2);
+      // string with a single char

   friend wxString WXDLLIMPEXP_BASE operator+(const wxString& string, wxChar ch);
   friend wxString WXDLLIMPEXP_BASE operator+(const wxString& string, wxChar ch);

-      //
+      // char with a string

   friend wxString WXDLLIMPEXP_BASE operator+(wxChar ch, const wxString& string);
   friend wxString WXDLLIMPEXP_BASE operator+(wxChar ch, const wxString& string);

-      //
-  friend wxString WXDLLIMPEXP_BASE operator+(const wxString& string, const wxChar *psz);
-      //
-  friend wxString WXDLLIMPEXP_BASE operator+(const wxChar *psz, const wxString& string);
+      // string with C string
+  friend wxString WXDLLIMPEXP_BASE operator+(const wxString& string,
+                                             const wxChar *psz);
+      // C string with string
+  friend wxString WXDLLIMPEXP_BASE operator+(const wxChar *psz,
+                                             const wxString& string);

 
   // stream-like functions
       // insert an int into string
 
   // stream-like functions
       // insert an int into string


@@ -1292,16 +1295,16 @@ public:
     { return (wxString&)wxStringBase::operator+=(ch); }
 };
 
     { return (wxString&)wxStringBase::operator+=(ch); }
 };
 

-// IBM xlC compiler needs these operators to be declared in global scope,
-// although this shouldn't be a problem for the other compilers we prefer to
-// only do it for it in stable 2.6 branch
-#ifdef __IBMCPP__
+// notice that even though for many compilers the friend declarations above are
+// enough, from the point of view of C++ standard we must have the declarations
+// here as friend ones are not injected in the enclosing namespace and without
+// them the code fails to compile with conforming compilers such as xlC or g++4

 wxString WXDLLIMPEXP_BASE operator+(const wxString& string1,  const wxString& string2);
 wxString WXDLLIMPEXP_BASE operator+(const wxString& string, wxChar ch);
 wxString WXDLLIMPEXP_BASE operator+(wxChar ch, const wxString& string);
 wxString WXDLLIMPEXP_BASE operator+(const wxString& string, const wxChar *psz);
 wxString WXDLLIMPEXP_BASE operator+(const wxChar *psz, const wxString& string);
 wxString WXDLLIMPEXP_BASE operator+(const wxString& string1,  const wxString& string2);
 wxString WXDLLIMPEXP_BASE operator+(const wxString& string, wxChar ch);
 wxString WXDLLIMPEXP_BASE operator+(wxChar ch, const wxString& string);
 wxString WXDLLIMPEXP_BASE operator+(const wxString& string, const wxChar *psz);
 wxString WXDLLIMPEXP_BASE operator+(const wxChar *psz, const wxString& string);

-#endif // __IBMCPP__
+

 
 // define wxArrayString, for compatibility
 #if WXWIN_COMPATIBILITY_2_4 && !wxUSE_STL
 
 // define wxArrayString, for compatibility
 #if WXWIN_COMPATIBILITY_2_4 && !wxUSE_STL