xapian-core/api/smallvector.cc

   1 /** @file smallvector.cc
   2  * @brief Append only vector of Xapian PIMPL objects
   3  */
   4 /* Copyright (C) 2012,2013,2014,2017 Olly Betts
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to
   8  * deal in the Software without restriction, including without limitation the
   9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  10  * sell copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 #include <config.h>
  26
  27 #include "api/smallvector.h"
  28
  29 #include <algorithm>
  30
  31 void
  32 Xapian::SmallVector_::do_reserve(std::size_t n)
  33 {
  34     // Logic error or size_t wrapping.
  35     if (rare(n <= c))
  36         throw std::bad_alloc();
  37     void ** blk = new void* [n];
  38     if (is_external()) {
  39         std::copy(static_cast<void **>(p[0]),
  40                   static_cast<void **>(p[1]),
  41                   blk);
  42         p[1] = blk +
  43             (static_cast<void**>(p[1]) - static_cast<void**>(p[0]));
  44         delete [] static_cast<void**>(p[0]);
  45     } else {
  46         std::copy(p, p + c, blk);
  47         p[1] = blk + c;
  48     }
  49     p[0] = blk;
  50     c = n;
  51 }
  52
  53 void
  54 Xapian::SmallVector_::do_free()
  55 {
  56     delete [] static_cast<void**>(p[0]);
  57 }