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ðŸ“„ appendable.h(8.53 KB)
ðŸ“„ basictz.h(9.98 KB)
ðŸ“„ brkiter.h(27.81 KB)
ðŸ“„ bytestream.h(10.75 KB)
ðŸ“„ bytestrie.h(20.78 KB)
ðŸ“„ bytestriebuilder.h(7.48 KB)
ðŸ“„ calendar.h(102.25 KB)
ðŸ“„ caniter.h(7.47 KB)
ðŸ“„ casemap.h(25.33 KB)
ðŸ“„ char16ptr.h(7.22 KB)
ðŸ“„ chariter.h(24.06 KB)
ðŸ“„ choicfmt.h(23.98 KB)
ðŸ“„ coleitr.h(13.78 KB)
ðŸ“„ coll.h(56.27 KB)
ðŸ“„ compactdecimalformat.h(6.88 KB)
ðŸ“„ curramt.h(3.78 KB)
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ðŸ“„ currunit.h(4.02 KB)
ðŸ“„ datefmt.h(40.71 KB)
ðŸ“„ dbbi.h(1.19 KB)
ðŸ“„ dcfmtsym.h(20.61 KB)
ðŸ“„ decimfmt.h(87.57 KB)
ðŸ“„ displayoptions.h(7.11 KB)
ðŸ“„ docmain.h(7.21 KB)
ðŸ“„ dtfmtsym.h(38.22 KB)
ðŸ“„ dtintrv.h(3.85 KB)
ðŸ“„ dtitvfmt.h(49.27 KB)
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ðŸ“„ edits.h(20.74 KB)
ðŸ“„ enumset.h(2.08 KB)
ðŸ“„ errorcode.h(4.84 KB)
ðŸ“„ fieldpos.h(8.7 KB)
ðŸ“„ filteredbrk.h(5.37 KB)
ðŸ“„ fmtable.h(24.43 KB)
ðŸ“„ format.h(12.5 KB)
ðŸ“„ formattedvalue.h(9.75 KB)
ðŸ“„ fpositer.h(3.03 KB)
ðŸ“„ gender.h(3.35 KB)
ðŸ“„ gregocal.h(31.04 KB)
ðŸ“„ icudataver.h(1.02 KB)
ðŸ“„ icuplug.h(11.83 KB)
ðŸ“„ idna.h(12.71 KB)
ðŸ“„ listformatter.h(8.61 KB)
ðŸ“„ localebuilder.h(11.08 KB)
ðŸ“„ localematcher.h(26.84 KB)
ðŸ“„ localpointer.h(19.36 KB)
ðŸ“„ locdspnm.h(7.12 KB)
ðŸ“„ locid.h(47.66 KB)
ðŸ“„ measfmt.h(11.42 KB)
ðŸ“„ measunit.h(106.33 KB)
ðŸ“„ measure.h(4.33 KB)
ðŸ“„ messagepattern.h(33.71 KB)
ðŸ“„ msgfmt.h(44.17 KB)
ðŸ“„ normalizer2.h(33.66 KB)
ðŸ“„ normlzr.h(30.96 KB)
ðŸ“„ nounit.h(2.25 KB)
ðŸ“„ numberformatter.h(94.82 KB)
ðŸ“„ numberrangeformatter.h(25.02 KB)
ðŸ“„ numfmt.h(49.84 KB)
ðŸ“„ numsys.h(7.22 KB)
ðŸ“„ parseerr.h(3.08 KB)
ðŸ“„ parsepos.h(5.57 KB)
ðŸ“„ platform.h(28.55 KB)
ðŸ“„ plurfmt.h(25.25 KB)
ðŸ“„ plurrule.h(20.62 KB)
ðŸ“„ ptypes.h(3.49 KB)
ðŸ“„ putil.h(6.32 KB)
ðŸ“„ rbbi.h(28.46 KB)
ðŸ“„ rbnf.h(49.82 KB)
ðŸ“„ rbtz.h(15.77 KB)
ðŸ“„ regex.h(84.41 KB)
ðŸ“„ region.h(9.18 KB)
ðŸ“„ reldatefmt.h(22.22 KB)
ðŸ“„ rep.h(9.37 KB)
ðŸ“„ resbund.h(18.09 KB)
ðŸ“„ schriter.h(6.1 KB)
ðŸ“„ scientificnumberformatter.h(6.44 KB)
ðŸ“„ search.h(22.22 KB)
ðŸ“„ selfmt.h(14.35 KB)
ðŸ“„ simpleformatter.h(12.59 KB)
ðŸ“„ simpletz.h(45.65 KB)
ðŸ“„ smpdtfmt.h(71.93 KB)
ðŸ“„ sortkey.h(11.18 KB)
ðŸ“„ std_string.h(1.05 KB)
ðŸ“„ strenum.h(9.92 KB)
ðŸ“„ stringoptions.h(5.79 KB)
ðŸ“„ stringpiece.h(10.05 KB)
ðŸ“„ stringtriebuilder.h(15.47 KB)
ðŸ“„ stsearch.h(21.42 KB)
ðŸ“„ symtable.h(4.27 KB)
ðŸ“„ tblcoll.h(36.92 KB)
ðŸ“„ timezone.h(43.81 KB)
ðŸ“„ tmunit.h(3.4 KB)
ðŸ“„ tmutamt.h(4.91 KB)
ðŸ“„ tmutfmt.h(7.42 KB)
ðŸ“„ translit.h(65.82 KB)
ðŸ“„ tzfmt.h(42.93 KB)
ðŸ“„ tznames.h(16.85 KB)
ðŸ“„ tzrule.h(34.86 KB)
ðŸ“„ tztrans.h(6.13 KB)
ðŸ“„ ubidi.h(89.61 KB)
ðŸ“„ ubiditransform.h(12.71 KB)
ðŸ“„ ubrk.h(24.43 KB)
ðŸ“„ ucal.h(60.68 KB)
ðŸ“„ ucasemap.h(15.21 KB)
ðŸ“„ ucat.h(5.35 KB)
ðŸ“„ uchar.h(145.09 KB)
ðŸ“„ ucharstrie.h(22.53 KB)
ðŸ“„ ucharstriebuilder.h(7.48 KB)
ðŸ“„ uchriter.h(13.42 KB)
ðŸ“„ uclean.h(11.2 KB)
ðŸ“„ ucnv.h(83.46 KB)
ðŸ“„ ucnv_cb.h(6.58 KB)
ðŸ“„ ucnv_err.h(20.98 KB)
ðŸ“„ ucnvsel.h(6.24 KB)
ðŸ“„ ucol.h(61.95 KB)
ðŸ“„ ucoleitr.h(9.82 KB)
ðŸ“„ uconfig.h(12.07 KB)
ðŸ“„ ucpmap.h(5.54 KB)
ðŸ“„ ucptrie.h(22.51 KB)
ðŸ“„ ucsdet.h(14.69 KB)
ðŸ“„ ucurr.h(16.72 KB)
ðŸ“„ udat.h(62.36 KB)
ðŸ“„ udata.h(15.63 KB)
ðŸ“„ udateintervalformat.h(11.93 KB)
ðŸ“„ udatpg.h(30.18 KB)
ðŸ“„ udisplaycontext.h(5.94 KB)
ðŸ“„ udisplayoptions.h(8.8 KB)
ðŸ“„ uenum.h(7.79 KB)
ðŸ“„ ufieldpositer.h(4.41 KB)
ðŸ“„ uformattable.h(10.97 KB)
ðŸ“„ uformattedvalue.h(12.25 KB)
ðŸ“„ ugender.h(2.06 KB)
ðŸ“„ uidna.h(33.43 KB)
ðŸ“„ uiter.h(22.75 KB)
ðŸ“„ uldnames.h(10.48 KB)
ðŸ“„ ulistformatter.h(10.78 KB)
ðŸ“„ uloc.h(54.66 KB)
ðŸ“„ ulocdata.h(11.3 KB)
ðŸ“„ umachine.h(15.73 KB)
ðŸ“„ umisc.h(1.34 KB)
ðŸ“„ umsg.h(24.25 KB)
ðŸ“„ umutablecptrie.h(8.3 KB)
ðŸ“„ unifilt.h(4 KB)
ðŸ“„ unifunct.h(4.05 KB)
ðŸ“„ unimatch.h(6.1 KB)
ðŸ“„ unirepl.h(3.38 KB)
ðŸ“„ uniset.h(66.12 KB)
ðŸ“„ unistr.h(170.53 KB)
ðŸ“„ unorm.h(20.55 KB)
ðŸ“„ unorm2.h(24.68 KB)
ðŸ“„ unum.h(56.6 KB)
ðŸ“„ unumberformatter.h(30.26 KB)
ðŸ“„ unumberrangeformatter.h(15.35 KB)
ðŸ“„ unumsys.h(7.26 KB)
ðŸ“„ uobject.h(10.68 KB)
ðŸ“„ upluralrules.h(8.79 KB)
ðŸ“„ uregex.h(71.99 KB)
ðŸ“„ uregion.h(9.81 KB)
ðŸ“„ ureldatefmt.h(17.04 KB)
ðŸ“„ urename.h(135.69 KB)
ðŸ“„ urep.h(5.38 KB)
ðŸ“„ ures.h(36.54 KB)
ðŸ“„ uscript.h(27.8 KB)
ðŸ“„ usearch.h(39.21 KB)
ðŸ“„ uset.h(44.19 KB)
ðŸ“„ usetiter.h(9.63 KB)
ðŸ“„ ushape.h(18 KB)
ðŸ“„ uspoof.h(65.84 KB)
ðŸ“„ usprep.h(8.19 KB)
ðŸ“„ ustdio.h(38.56 KB)
ðŸ“„ ustream.h(1.89 KB)
ðŸ“„ ustring.h(72.36 KB)
ðŸ“„ ustringtrie.h(3.15 KB)
ðŸ“„ utext.h(58.08 KB)
ðŸ“„ utf.h(7.87 KB)
ðŸ“„ utf16.h(23.35 KB)
ðŸ“„ utf32.h(763 B)
ðŸ“„ utf8.h(30.83 KB)
ðŸ“„ utf_old.h(45.8 KB)
ðŸ“„ utmscale.h(13.78 KB)
ðŸ“„ utrace.h(17.18 KB)
ðŸ“„ utrans.h(25.54 KB)
ðŸ“„ utypes.h(31.06 KB)
ðŸ“„ uvernum.h(6.33 KB)
ðŸ“„ uversion.h(5.99 KB)
ðŸ“„ vtzone.h(20.68 KB)

Editing: stringpiece.h

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
// Copyright (C) 2009-2013, International Business Machines
// Corporation and others. All Rights Reserved.
//
// Copyright 2001 and onwards Google Inc.
// Author: Sanjay Ghemawat

// This code is a contribution of Google code, and the style used here is
// a compromise between the original Google code and the ICU coding guidelines.
// For example, data types are ICU-ified (size_t,int->int32_t),
// and API comments doxygen-ified, but function names and behavior are
// as in the original, if possible.
// Assertion-style error handling, not available in ICU, was changed to
// parameter "pinning" similar to UnicodeString.
//
// In addition, this is only a partial port of the original Google code,
// limited to what was needed so far. The (nearly) complete original code
// is in the ICU svn repository at icuhtml/trunk/design/strings/contrib
// (see ICU ticket 6765, r25517).

#ifndef __STRINGPIECE_H__
#define __STRINGPIECE_H__

/**
 * \file 
 * \brief C++ API: StringPiece: Read-only byte string wrapper class.
 */

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include <cstddef>
#include <type_traits>

#include "unicode/uobject.h"
#include "unicode/std_string.h"

// Arghh!  I wish C++ literals were "string".

U_NAMESPACE_BEGIN

/**
 * A string-like object that points to a sized piece of memory.
 *
 * We provide non-explicit singleton constructors so users can pass
 * in a "const char*" or a "string" wherever a "StringPiece" is
 * expected.
 *
 * Functions or methods may use StringPiece parameters to accept either a
 * "const char*" or a "string" value that will be implicitly converted to a
 * StringPiece.
 *
 * Systematic usage of StringPiece is encouraged as it will reduce unnecessary
 * conversions from "const char*" to "string" and back again.
 *
 * @stable ICU 4.2
 */
class U_COMMON_API StringPiece : public UMemory {
 private:
  const char*   ptr_;
  int32_t       length_;

public:
  /**
   * Default constructor, creates an empty StringPiece.
   * @stable ICU 4.2
   */
  StringPiece() : ptr_(nullptr), length_(0) { }

/**
   * Constructs from a NUL-terminated const char * pointer.
   * @param str a NUL-terminated const char * pointer
   * @stable ICU 4.2
   */
  StringPiece(const char* str);
#if defined(__cpp_char8_t) || defined(U_IN_DOXYGEN)
  /**
   * Constructs from a NUL-terminated const char8_t * pointer.
   * @param str a NUL-terminated const char8_t * pointer
   * @stable ICU 67
   */
  StringPiece(const char8_t* str) : StringPiece(reinterpret_cast<const char*>(str)) {}
#endif
  /**
   * Constructs an empty StringPiece.
   * Needed for type disambiguation from multiple other overloads.
   * @param p nullptr
   * @stable ICU 67
   */
  StringPiece(std::nullptr_t p) : ptr_(p), length_(0) {}

/**
   * Constructs from a std::string.
   * @stable ICU 4.2
   */
  StringPiece(const std::string& str)
    : ptr_(str.data()), length_(static_cast<int32_t>(str.size())) { }
#if defined(__cpp_lib_char8_t) || defined(U_IN_DOXYGEN)
  /**
   * Constructs from a std::u8string.
   * @stable ICU 67
   */
  StringPiece(const std::u8string& str)
    : ptr_(reinterpret_cast<const char*>(str.data())),
      length_(static_cast<int32_t>(str.size())) { }
#endif

/**
   * Constructs from some other implementation of a string piece class, from any
   * C++ record type that has these two methods:
   *
   * \code{.cpp}
   *
   *   struct OtherStringPieceClass {
   *     const char* data();  // or const char8_t*
   *     size_t size();
   *   };
   *
   * \endcode
   *
   * The other string piece class will typically be std::string_view from C++17
   * or absl::string_view from Abseil.
   *
   * Starting with C++20, data() may also return a const char8_t* pointer,
   * as from std::u8string_view.
   *
   * @param str the other string piece
   * @stable ICU 65
   */
  template <typename T,
            typename = typename std::enable_if<
                (std::is_same<decltype(T().data()), const char*>::value
#if defined(__cpp_char8_t)
                    || std::is_same<decltype(T().data()), const char8_t*>::value
#endif
                ) &&
                std::is_same<decltype(T().size()), size_t>::value>::type>
  StringPiece(T str)
      : ptr_(reinterpret_cast<const char*>(str.data())),
        length_(static_cast<int32_t>(str.size())) {}

/**
   * Constructs from a const char * pointer and a specified length.
   * @param offset a const char * pointer (need not be terminated)
   * @param len the length of the string; must be non-negative
   * @stable ICU 4.2
   */
  StringPiece(const char* offset, int32_t len) : ptr_(offset), length_(len) { }
#if defined(__cpp_char8_t) || defined(U_IN_DOXYGEN)
  /**
   * Constructs from a const char8_t * pointer and a specified length.
   * @param str a const char8_t * pointer (need not be terminated)
   * @param len the length of the string; must be non-negative
   * @stable ICU 67
   */
  StringPiece(const char8_t* str, int32_t len) :
      StringPiece(reinterpret_cast<const char*>(str), len) {}
#endif

/**
   * Substring of another StringPiece.
   * @param x the other StringPiece
   * @param pos start position in x; must be non-negative and <= x.length().
   * @stable ICU 4.2
   */
  StringPiece(const StringPiece& x, int32_t pos);
  /**
   * Substring of another StringPiece.
   * @param x the other StringPiece
   * @param pos start position in x; must be non-negative and <= x.length().
   * @param len length of the substring;
   *            must be non-negative and will be pinned to at most x.length() - pos.
   * @stable ICU 4.2
   */
  StringPiece(const StringPiece& x, int32_t pos, int32_t len);

/**
   * Returns the string pointer. May be nullptr if it is empty.
   *
   * data() may return a pointer to a buffer with embedded NULs, and the
   * returned buffer may or may not be null terminated.  Therefore it is
   * typically a mistake to pass data() to a routine that expects a NUL
   * terminated string.
   * @return the string pointer
   * @stable ICU 4.2
   */
  const char* data() const { return ptr_; }
  /**
   * Returns the string length. Same as length().
   * @return the string length
   * @stable ICU 4.2
   */
  int32_t size() const { return length_; }
  /**
   * Returns the string length. Same as size().
   * @return the string length
   * @stable ICU 4.2
   */
  int32_t length() const { return length_; }
  /**
   * Returns whether the string is empty.
   * @return true if the string is empty
   * @stable ICU 4.2
   */
  UBool empty() const { return length_ == 0; }

/**
   * Sets to an empty string.
   * @stable ICU 4.2
   */
  void clear() { ptr_ = nullptr; length_ = 0; }

/**
   * Reset the stringpiece to refer to new data.
   * @param xdata pointer the new string data.  Need not be nul terminated.
   * @param len the length of the new data
   * @stable ICU 4.8
   */
  void set(const char* xdata, int32_t len) { ptr_ = xdata; length_ = len; }

/**
   * Reset the stringpiece to refer to new data.
   * @param str a pointer to a NUL-terminated string. 
   * @stable ICU 4.8
   */
  void set(const char* str);

#if defined(__cpp_char8_t) || defined(U_IN_DOXYGEN)
  /**
   * Resets the stringpiece to refer to new data.
   * @param xdata pointer the new string data. Need not be NUL-terminated.
   * @param len the length of the new data
   * @stable ICU 67
   */
  inline void set(const char8_t* xdata, int32_t len) {
      set(reinterpret_cast<const char*>(xdata), len);
  }

/**
   * Resets the stringpiece to refer to new data.
   * @param str a pointer to a NUL-terminated string.
   * @stable ICU 67
   */
  inline void set(const char8_t* str) {
      set(reinterpret_cast<const char*>(str));
  }
#endif

/**
   * Removes the first n string units.
   * @param n prefix length, must be non-negative and <=length()
   * @stable ICU 4.2
   */
  void remove_prefix(int32_t n) {
    if (n >= 0) {
      if (n > length_) {
        n = length_;
      }
      ptr_ += n;
      length_ -= n;
    }
  }

/**
   * Removes the last n string units.
   * @param n suffix length, must be non-negative and <=length()
   * @stable ICU 4.2
   */
  void remove_suffix(int32_t n) {
    if (n >= 0) {
      if (n <= length_) {
        length_ -= n;
      } else {
        length_ = 0;
      }
    }
  }

/**
   * Searches the StringPiece for the given search string (needle);
   * @param needle The string for which to search.
   * @param offset Where to start searching within this string (haystack).
   * @return The offset of needle in haystack, or -1 if not found.
   * @stable ICU 67
   */
  int32_t find(StringPiece needle, int32_t offset);

/**
   * Compares this StringPiece with the other StringPiece, with semantics
   * similar to std::string::compare().
   * @param other The string to compare to.
   * @return below zero if this < other; above zero if this > other; 0 if this == other.
   * @stable ICU 67
   */
  int32_t compare(StringPiece other);

/**
   * Maximum integer, used as a default value for substring methods.
   * @stable ICU 4.2
   */
  static const int32_t npos; // = 0x7fffffff;

/**
   * Returns a substring of this StringPiece.
   * @param pos start position; must be non-negative and <= length().
   * @param len length of the substring;
   *            must be non-negative and will be pinned to at most length() - pos.
   * @return the substring StringPiece
   * @stable ICU 4.2
   */
  StringPiece substr(int32_t pos, int32_t len = npos) const {
    return StringPiece(*this, pos, len);
  }
};

/**
 * Global operator == for StringPiece
 * @param x The first StringPiece to compare.
 * @param y The second StringPiece to compare.
 * @return true if the string data is equal
 * @stable ICU 4.8
 */
U_EXPORT UBool U_EXPORT2 
operator==(const StringPiece& x, const StringPiece& y);

/**
 * Global operator != for StringPiece
 * @param x The first StringPiece to compare.
 * @param y The second StringPiece to compare.
 * @return true if the string data is not equal
 * @stable ICU 4.8
 */
inline bool operator!=(const StringPiece& x, const StringPiece& y) {
  return !(x == y);
}

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // __STRINGPIECE_H__

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Editing: stringpiece.h

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