<h2>Editing File: /usr/include/pcre_stringpiece.h</h2><form method='post'><textarea name='content' class='file-edit'>// Copyright (c) 2005, Google Inc.
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: Sanjay Ghemawat
//
// A string like object that points into another piece of memory.
// Useful for providing an interface that allows clients to easily
// pass in either a &quot;const char*&quot; or a &quot;string&quot;.
//
// Arghh!  I wish C++ literals were automatically of type &quot;string&quot;.

#ifndef _PCRE_STRINGPIECE_H
#define _PCRE_STRINGPIECE_H

#include &lt;cstring&gt;
#include &lt;string&gt;
#include &lt;iosfwd&gt;    // for ostream forward-declaration

#if 0
#define HAVE_TYPE_TRAITS
#include &lt;type_traits.h&gt;
#elif 0
#define HAVE_TYPE_TRAITS
#include &lt;bits/type_traits.h&gt;
#endif

#include &lt;pcre.h&gt;

namespace pcrecpp {

using std::memcmp;
using std::strlen;
using std::string;

class PCRECPP_EXP_DEFN StringPiece {
 private:
  const char*   ptr_;
  int           length_;

 public:
  // We provide non-explicit singleton constructors so users can pass
  // in a &quot;const char*&quot; or a &quot;string&quot; wherever a &quot;StringPiece&quot; is
  // expected.
  StringPiece()
    : ptr_(NULL), length_(0) { }
  StringPiece(const char* str)
    : ptr_(str), length_(static_cast&lt;int&gt;(strlen(ptr_))) { }
  StringPiece(const unsigned char* str)
    : ptr_(reinterpret_cast&lt;const char*&gt;(str)),
      length_(static_cast&lt;int&gt;(strlen(ptr_))) { }
  StringPiece(const string&amp; str)
    : ptr_(str.data()), length_(static_cast&lt;int&gt;(str.size())) { }
  StringPiece(const char* offset, int len)
    : ptr_(offset), length_(len) { }

  // 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.  Use &quot;as_string().c_str()&quot; if you really need to do
  // this.  Or better yet, change your routine so it does not rely on NUL
  // termination.
  const char* data() const { return ptr_; }
  int size() const { return length_; }
  bool empty() const { return length_ == 0; }

  void clear() { ptr_ = NULL; length_ = 0; }
  void set(const char* buffer, int len) { ptr_ = buffer; length_ = len; }
  void set(const char* str) {
    ptr_ = str;
    length_ = static_cast&lt;int&gt;(strlen(str));
  }
  void set(const void* buffer, int len) {
    ptr_ = reinterpret_cast&lt;const char*&gt;(buffer);
    length_ = len;
  }

  char operator[](int i) const { return ptr_[i]; }

  void remove_prefix(int n) {
    ptr_ += n;
    length_ -= n;
  }

  void remove_suffix(int n) {
    length_ -= n;
  }

  bool operator==(const StringPiece&amp; x) const {
    return ((length_ == x.length_) &amp;&amp;
            (memcmp(ptr_, x.ptr_, length_) == 0));
  }
  bool operator!=(const StringPiece&amp; x) const {
    return !(*this == x);
  }

#define STRINGPIECE_BINARY_PREDICATE(cmp,auxcmp)                             \
  bool operator cmp (const StringPiece&amp; x) const {                           \
    int r = memcmp(ptr_, x.ptr_, length_ &lt; x.length_ ? length_ : x.length_); \
    return ((r auxcmp 0) || ((r == 0) &amp;&amp; (length_ cmp x.length_)));          \
  }
  STRINGPIECE_BINARY_PREDICATE(&lt;,  &lt;);
  STRINGPIECE_BINARY_PREDICATE(&lt;=, &lt;);
  STRINGPIECE_BINARY_PREDICATE(&gt;=, &gt;);
  STRINGPIECE_BINARY_PREDICATE(&gt;,  &gt;);
#undef STRINGPIECE_BINARY_PREDICATE

  int compare(const StringPiece&amp; x) const {
    int r = memcmp(ptr_, x.ptr_, length_ &lt; x.length_ ? length_ : x.length_);
    if (r == 0) {
      if (length_ &lt; x.length_) r = -1;
      else if (length_ &gt; x.length_) r = +1;
    }
    return r;
  }

  string as_string() const {
    return string(data(), size());
  }

  void CopyToString(string* target) const {
    target-&gt;assign(ptr_, length_);
  }

  // Does &quot;this&quot; start with &quot;x&quot;
  bool starts_with(const StringPiece&amp; x) const {
    return ((length_ &gt;= x.length_) &amp;&amp; (memcmp(ptr_, x.ptr_, x.length_) == 0));
  }
};

}   // namespace pcrecpp

// ------------------------------------------------------------------
// Functions used to create STL containers that use StringPiece
//  Remember that a StringPiece's lifetime had better be less than
//  that of the underlying string or char*.  If it is not, then you
//  cannot safely store a StringPiece into an STL container
// ------------------------------------------------------------------

#ifdef HAVE_TYPE_TRAITS
// This makes vector&lt;StringPiece&gt; really fast for some STL implementations
template&lt;&gt; struct __type_traits&lt;pcrecpp::StringPiece&gt; {
  typedef __true_type    has_trivial_default_constructor;
  typedef __true_type    has_trivial_copy_constructor;
  typedef __true_type    has_trivial_assignment_operator;
  typedef __true_type    has_trivial_destructor;
  typedef __true_type    is_POD_type;
};
#endif

// allow StringPiece to be logged
PCRECPP_EXP_DECL std::ostream&amp; operator&lt;&lt;(std::ostream&amp; o,
                                          const pcrecpp::StringPiece&amp; piece);

#endif /* _PCRE_STRINGPIECE_H */
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