Changed the gui core code around so that it should be safe to make window

objects at the global scope

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402526

dlib/gui_widgets/fonts.cpp

@@ -16,9 +16,6 @@
 namespace dlib
 {
 
-    scoped_ptr<default_font> default_font::f;
-    mutex default_font::m;
-
 // ----------------------------------------------------------------------------------------
 
     const std::string get_decoded_string_with_default_font_data()

dlib/gui_widgets/fonts.h

@@ -491,13 +491,14 @@ namespace dlib
         default_font(default_font&);        // copy constructor
         default_font& operator=(default_font&);    // assignment operator   
 
-        static scoped_ptr<default_font> f;
-        static mutex m;
+
 
     public:
         static const font* get_font (
         )
         {        
+            static mutex m;
+            static scoped_ptr<default_font> f;
             auto_mutex M(m);
             if (f.get() == 0)
                 f.reset(new default_font);

dlib/test/gui/main.cpp

@@ -771,13 +771,13 @@ private:
 };
 
 
+        win w;
 
 int main()
 {
 
     try
     {
-        win w;
         w.set_pos (100,200);
         w.set_title("test window");
         w.show();

dlib/unicode/unicode.cpp

@@ -15,7 +15,7 @@ namespace dlib
     static const unichar SURROGATE_FIRST_TOP = 0xD800;
     static const unichar SURROGATE_SECOND_TOP = 0xDC00;
     static const unichar SURROGATE_CLEARING_MASK = 0x03FF;
-    static const unichar &SURROGATE_TOP = SURROGATE_FIRST_TOP;
+    static const unichar SURROGATE_TOP = SURROGATE_FIRST_TOP;
     static const unichar SURROGATE_END = 0xE000;
     static const unichar SMP_TOP = 0x10000;
     static const int VALID_BITS = 10;