interface/wx/chartype.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        chartype.h
   3 // Purpose:     interface of global functions
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /** @addtogroup group_funcmacro_string */
  10 //@{
  11
  12 /**
  13     This macro can be used with character and string literals (in other words,
  14     @c 'x' or @c "foo") to automatically convert them to wide strings in Unicode
  15     builds of wxWidgets. This macro simply returns the value passed to it
  16     without changes in ASCII build. In fact, its definition is:
  17
  18     @code
  19     #ifdef UNICODE
  20     #   define wxT(x)  L##x
  21     #else // !Unicode
  22     #   define wxT(x)  x
  23     #endif
  24     @endcode
  25
  26     Note that since wxWidgets 2.9.0 you shouldn't use wxT() anymore in your
  27     program sources (it was previously required if you wanted to support Unicode).
  28
  29     @see @ref overview_unicode, wxS()
  30
  31     @header{wx/chartype.h}
  32 */
  33 #define wxT(string)
  34
  35 /**
  36     Compatibility macro which expands to wxT() in wxWidgets 2 only.
  37
  38     This macro can be used in code which needs to compile with both
  39     wxWidgets 2 and 3 versions, in places where the wx2 API requires a Unicode string
  40     (in Unicode build) but the wx3 API only accepts a standard narrow
  41     string, as in e.g. wxCmdLineEntryDesc structure objects initializers.
  42
  43     Example of use:
  44     @code
  45     const wxCmdLineEntryDesc cmdLineDesc[] =
  46     {
  47         { wxCMD_LINE_SWITCH, wxT_2("q"), wxT_2("quiet"),
  48           wxT_2("Don't output verbose messages") },
  49         wxCMD_LINE_DESC_END
  50     };
  51     @endcode
  52
  53     Without @c wxT_2 the code above wouldn't compile with wxWidgets 2, but using @c
  54     wxT instead, it wouldn't compile with wxWidgets 3.
  55
  56     @see wxT()
  57
  58     @since 2.8.12, 2.9.2
  59
  60     @header{wx/chartype.h}
  61  */
  62 #define wxT_2(string)
  63
  64 /**
  65     wxS is a macro which can be used with character and string literals (in other words,
  66     @c 'x' or @c "foo") to convert them either to wide characters or wide strings
  67     in @c wchar_t-based (UTF-16) builds, or to keep them unchanged in @c char-based
  68     (UTF-8) builds.
  69
  70     Basically this macro produces characters or strings of type wxStringCharType.
  71
  72     The use of this macro is optional as the translation will always be done at
  73     run-time even if there is a mismatch between the kind of the literal used
  74     and the string or character type used in the current build.
  75     However using it can be beneficial in <b>performance-sensitive code</b> to
  76     do the conversion at compile-time instead.
  77
  78     @see @ref overview_unicode, wxT()
  79
  80     @header{wx/chartype.h}
  81 */
  82 #define wxS(string)
  83
  84 /**
  85     This macro is exactly the same as wxT() and is defined in wxWidgets simply
  86     because it may be more intuitive for Windows programmers as the standard
  87     Win32 headers also define it (as well as yet another name for the same
  88     macro which is _TEXT()).
  89
  90     Don't confuse this macro with _()!
  91
  92     Note that since wxWidgets 2.9.0 the use of _T() is discouraged just like
  93     for wxT() and also that this macro may conflict with identifiers defined in
  94     standard headers of some compilers (such as Sun CC) so its use should
  95     really be avoided.
  96
  97     @header{wx/chartype.h}
  98 */
  99 #define _T(string)
 100
 101 /**
 102     wxChar is defined to be
 103     \- @c char when <tt>wxUSE_UNICODE==0</tt>
 104     \- @c wchar_t when <tt>wxUSE_UNICODE==1</tt> (the default).
 105 */
 106 typedef wxUSE_UNICODE_dependent wxChar;
 107
 108 /**
 109     wxSChar is defined to be
 110     \- <tt>signed char</tt> when <tt>wxUSE_UNICODE==0</tt>
 111     \- @c wchar_t when <tt>wxUSE_UNICODE==1</tt> (the default).
 112 */
 113 typedef wxUSE_UNICODE_dependent wxSChar;
 114
 115 /**
 116     wxUChar is defined to be
 117     \- <tt>unsigned char</tt> when <tt>wxUSE_UNICODE==0</tt>
 118     \- @c wchar_t when <tt>wxUSE_UNICODE==1</tt> (the default).
 119 */
 120 typedef wxUSE_UNICODE_dependent wxUChar;
 121
 122 /**
 123     wxStringCharType is defined to be:
 124     \- @c char when <tt>wxUSE_UNICODE==0</tt>
 125     \- @c char when <tt>wxUSE_UNICODE_WCHAR==0</tt> and <tt>wxUSE_UNICODE==1</tt>
 126     \- @c wchar_t when <tt>wxUSE_UNICODE_WCHAR==1</tt> and <tt>wxUSE_UNICODE==1</tt>
 127
 128     The @c wxUSE_UNICODE_WCHAR symbol is defined to @c 1 when building on
 129     Windows while it's defined to @c 0 when building on Unix, Linux or OS X.
 130     (Note that @c wxUSE_UNICODE_UTF8 symbol is defined as the opposite of
 131     @c wxUSE_UNICODE_WCHAR.)
 132
 133     Note that wxStringCharType (as the name says) is the type used by wxString
 134     for internal storage of the characters.
 135 */
 136 typedef wxUSE_UNICODE_WCHAR_dependent wxStringCharType;
 137
 138 //@}