Preparing wxString for UTF-8 representation:

1) split into wxStringImpl class that has std::string-like API and operates on char* or wchar_t* data and wxString class that provides Unicode iterators and indexes
2) added both char* and wchar_t* versions of many wxString methods to avoid having to use _T()


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45078 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/chartype.h

@@ -183,6 +183,31 @@
     #endif /* __WCHAR_TYPE__ */
 #endif /* ASCII/Unicode */
 
+/* ------------------------------------------------------------------------- */
+/* define wxStringCharType                                                   */
+/* ------------------------------------------------------------------------- */
+
+/* depending on the platform, Unicode build can either store wxStrings as
+   wchar_t* or UTF-8 encoded char*: */
+#if wxUSE_UNICODE
+    /* for now, all Unicode builds are wchar_t* based: */
+    #define wxUSE_UNICODE_WCHAR 1
+    #define wxUSE_UNICODE_UTF8  0
+#else
+    #define wxUSE_UNICODE_WCHAR 0
+    #define wxUSE_UNICODE_UTF8  0
+#endif
+
+/* define char type used by wxString internal representation: */
+#if wxUSE_UNICODE_UTF8
+    typedef char wxStringCharType;
+#elif wxUSE_UNICODE_WCHAR
+    typedef wchar_t wxStringCharType;
+#else
+    typedef char wxStringCharType;
+#endif
+
+
 /* ------------------------------------------------------------------------- */
 /* define _T() and related macros                                            */
 /* ------------------------------------------------------------------------- */