icuSources/common/charstr.h

   1 /*
   2 **********************************************************************
   3 *   Copyright (c) 2001, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *   Date        Name        Description
   7 *   11/19/2001  aliu        Creation.
   8 **********************************************************************
   9 */
  10
  11 #include "unicode/utypes.h"
  12 #include "unicode/uobject.h"
  13 #include "unicode/unistr.h"
  14 #include "cmemory.h"
  15
  16 //--------------------------------------------------------------------
  17 // class CharString
  18 //
  19 // This is a tiny wrapper class that is used internally to make a
  20 // UnicodeString look like a const char*.  It can be allocated on the
  21 // stack.  It only creates a heap buffer if it needs to.
  22 //--------------------------------------------------------------------
  23
  24 U_NAMESPACE_BEGIN
  25
  26 class U_COMMON_API CharString : public UMemory {
  27 public:
  28     inline CharString(const UnicodeString& str);
  29     inline ~CharString();
  30     inline operator const char*() const { return ptr; }
  31
  32 private:
  33     char buf[128];
  34     char* ptr;
  35
  36     CharString(const CharString &other); // forbid copying of this class
  37     CharString &operator=(const CharString &other); // forbid copying of this class
  38 };
  39
  40 inline CharString::CharString(const UnicodeString& str) {
  41     // Invariant converter should create str.length() chars
  42     if (str.length() >= (int32_t)sizeof(buf)) {
  43         ptr = (char *)uprv_malloc(str.length() + 8);
  44     } else {
  45         ptr = buf;
  46     }
  47     str.extract(0, 0x7FFFFFFF, ptr, "");
  48 }
  49
  50 inline CharString::~CharString() {
  51     if (ptr != buf) {
  52         uprv_free(ptr);
  53     }
  54 }
  55
  56 U_NAMESPACE_END
  57
  58 //eof