initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/include/wx/meta/implicitconversion.h

@@ -0,0 +1,100 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/meta/implicitconversion.h
+// Purpose:     Determine resulting type from implicit conversion
+// Author:      Vaclav Slavik
+// Created:     2010-10-22
+// Copyright:   (c) 2010 Vaclav Slavik
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_META_IMPLICITCONVERSION_H_
+#define _WX_META_IMPLICITCONVERSION_H_
+
+#include "wx/defs.h"
+#include "wx/meta/if.h"
+
+// C++ hierarchy of data types is:
+//
+//   Long double (highest)
+//   Double
+//   Float
+//   Unsigned long int
+//   Long int
+//   Unsigned int
+//   Int (lowest)
+//
+// Types lower in the hierarchy are converted into ones higher up if both are
+// involved e.g. in arithmetic expressions.
+
+namespace wxPrivate
+{
+
+template<typename T>
+struct TypeHierarchy
+{
+    // consider unknown types (e.g. objects, pointers) to be of highest
+    // level, always convert to them if they occur
+    static const int level = 9999;
+};
+
+#define WX_TYPE_HIERARCHY_LEVEL(level_num, type)        \
+    template<> struct TypeHierarchy<type>               \
+    {                                                   \
+        static const int level = level_num;             \
+    }
+
+WX_TYPE_HIERARCHY_LEVEL( 1, char);
+WX_TYPE_HIERARCHY_LEVEL( 2, unsigned char);
+WX_TYPE_HIERARCHY_LEVEL( 3, short);
+WX_TYPE_HIERARCHY_LEVEL( 4, unsigned short);
+WX_TYPE_HIERARCHY_LEVEL( 5, int);
+WX_TYPE_HIERARCHY_LEVEL( 6, unsigned int);
+WX_TYPE_HIERARCHY_LEVEL( 7, long);
+WX_TYPE_HIERARCHY_LEVEL( 8, unsigned long);
+WX_TYPE_HIERARCHY_LEVEL( 9, wxLongLong_t);
+WX_TYPE_HIERARCHY_LEVEL(10, wxULongLong_t);
+WX_TYPE_HIERARCHY_LEVEL(11, float);
+WX_TYPE_HIERARCHY_LEVEL(12, double);
+WX_TYPE_HIERARCHY_LEVEL(13, long double);
+
+#if wxWCHAR_T_IS_REAL_TYPE
+    #if SIZEOF_WCHAR_T == SIZEOF_SHORT
+      template<> struct TypeHierarchy<wchar_t> : public TypeHierarchy<short> {};
+    #elif SIZEOF_WCHAR_T == SIZEOF_INT
+      template<> struct TypeHierarchy<wchar_t> : public TypeHierarchy<int> {};
+    #elif SIZEOF_WCHAR_T == SIZEOF_LONG
+      template<> struct TypeHierarchy<wchar_t> : public TypeHierarchy<long> {};
+    #else
+      #error "weird wchar_t size, please update this code"
+    #endif
+#endif
+
+#undef WX_TYPE_HIERARCHY_LEVEL
+
+} // namespace wxPrivate
+
+// Helper to determine resulting type of implicit conversion in
+// an expression with two arithmetic types.
+template<typename T1, typename T2>
+struct wxImplicitConversionType
+{
+    typedef typename wxIf
+            <
+                // if T2 is "higher" type, convert to it
+                (int)(wxPrivate::TypeHierarchy<T1>::level) < (int)(wxPrivate::TypeHierarchy<T2>::level),
+                T2,
+                // otherwise use T1
+                T1
+            >::value
+            value;
+};
+
+
+template<typename T1, typename T2, typename T3>
+struct wxImplicitConversionType3 : public wxImplicitConversionType<
+                        T1,
+                        typename wxImplicitConversionType<T2,T3>::value>
+{
+};
+
+#endif // _WX_META_IMPLICITCONVERSION_H_