icuSources/common/cstr.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 ******************************************************************************
   5 *
   6 *   Copyright (C) 2016, International Business Machines
   7 *   Corporation and others.  All Rights Reserved.
   8 *
   9 ******************************************************************************
  10 *
  11 * File: cstr.h
  12 */
  13
  14 #ifndef CSTR_H
  15 #define CSTR_H
  16
  17 #include "unicode/unistr.h"
  18 #include "unicode/uobject.h"
  19 #include "unicode/utypes.h"
  20
  21 #include "charstr.h"
  22
  23 /**
  24  * ICU-internal class CStr, a small helper class to facilitate passing UnicodeStrings
  25  * to functions needing (const char *) strings, such as printf().
  26  *
  27  * It is intended primarily for use in debugging or in tests. Uses platform
  28  * default code page conversion, which will do the best job possible,
  29  * but may be lossy, depending on the platform.
  30  *
  31  * If no other conversion is available, use invariant conversion and substitue
  32  * '?' for non-invariant characters.
  33  *
  34  * Example Usage:
  35  *   UnicodeString s = whatever;
  36  *   printf("%s", CStr(s)());
  37  *
  38  *   The explicit call to the CStr() constructor creates a temporary object.
  39  *   Operator () on the temporary object returns a (const char *) pointer.
  40  *   The lifetime of the (const char *) data is that of the temporary object,
  41  *   which works well when passing it as a parameter to another function, such as printf.
  42  */
  43
  44 U_NAMESPACE_BEGIN
  45
  46 class U_COMMON_API CStr : public UMemory {
  47   public:
  48     CStr(const UnicodeString &in);
  49     ~CStr();
  50     const char * operator ()() const;
  51
  52   private:
  53     CharString s;
  54     CStr(const CStr &other);               //  Forbid copying of this class.
  55     CStr &operator =(const CStr &other);   //  Forbid assignment.
  56 };
  57
  58 U_NAMESPACE_END
  59
  60 #endif