Add conversions to/from long long to wxUniChar.

Allow conversions to/from long long and unsigned long long values in wxUniChar
for consistency with the other integral types.

Also make the code shorter by using helper wxDO_FOR_INT_TYPES() and
wxDO_FOR_CHAR_INT_TYPES() macros to avoid duplicating the same code for all of
the integral types and having to handle wchar_t (and wxLongLong_t now)
specially because sometimes we may need to overload on it and sometimes not.

Finally, add more tests to check that all the wxUniChar methods compile and
work with all the different types.

Closes #15206.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74029 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/defs.h

@@ -1115,6 +1115,17 @@ typedef wxUint32 wxDword;
 
 #endif
 
+/*
+    Helper macro for conditionally compiling some code only if wxLongLong_t is
+    available and is a type different from the other integer types (i.e. not
+    long).
+ */
+#ifdef wxHAS_LONG_LONG_T_DIFFERENT_FROM_LONG
+    #define wxIF_LONG_LONG_TYPE(x) x
+#else
+    #define wxIF_LONG_LONG_TYPE(x)
+#endif
+
 
 /* Make sure ssize_t is defined (a signed type the same size as size_t). */
 /* (HAVE_SSIZE_T is not already defined by configure) */
@@ -1307,6 +1318,63 @@ typedef double wxDouble;
 #endif
 
 
+/*
+    Helper macro expanding into the given "m" macro invoked with each of the
+    integer types as parameter (notice that this does not include char/unsigned
+    char and bool but does include wchar_t).
+ */
+#define wxDO_FOR_INT_TYPES(m) \
+    m(short) \
+    m(unsigned short) \
+    m(int) \
+    m(unsigned int) \
+    m(long) \
+    m(unsigned long) \
+    wxIF_LONG_LONG_TYPE( m(wxLongLong_t) ) \
+    wxIF_LONG_LONG_TYPE( m(wxULongLong_t) ) \
+    wxIF_WCHAR_T_TYPE( m(wchar_t) )
+
+/*
+    Same as wxDO_FOR_INT_TYPES() but does include char and unsigned char.
+
+    Notice that we use "char" and "unsigned char" here but not "signed char"
+    which would be more correct as "char" could be unsigned by default. But
+    wxWidgets code currently supposes that char is signed and we'd need to
+    clean up assumptions about it, notably in wx/unichar.h, to be able to use
+    "signed char" here.
+ */
+#define wxDO_FOR_CHAR_INT_TYPES(m) \
+    m(char) \
+    m(unsigned char) \
+    wxDO_FOR_INT_TYPES(m)
+
+/*
+    Same as wxDO_FOR_INT_TYPES() above except that m macro takes the
+    type as the first argument and some extra argument, passed from this macro
+    itself, as the second one.
+ */
+#define wxDO_FOR_INT_TYPES_1(m, arg) \
+    m(short, arg) \
+    m(unsigned short, arg) \
+    m(int, arg) \
+    m(unsigned int, arg) \
+    m(long, arg) \
+    m(unsigned long, arg) \
+    wxIF_LONG_LONG_TYPE( m(wxLongLong_t, arg) ) \
+    wxIF_LONG_LONG_TYPE( m(wxULongLong_t, arg) ) \
+    wxIF_WCHAR_T_TYPE( m(wchar_t, arg) )
+
+/*
+    Combination of wxDO_FOR_CHAR_INT_TYPES() and wxDO_FOR_INT_TYPES_1():
+    invokes the given macro with the specified argument as its second parameter
+    for all char and int types.
+ */
+#define wxDO_FOR_CHAR_INT_TYPES_1(m, arg) \
+    m(char, arg) \
+    m(unsigned char, arg) \
+    wxDO_FOR_INT_TYPES_1(m, arg)
+
+
 /*  ---------------------------------------------------------------------------- */
 /*  byte ordering related definition and macros */
 /*  ---------------------------------------------------------------------------- */