ceph/src/boost/libs/container/example/doc_move_containers.cpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2009-2013. Distributed under the Boost
   4 // Software License, Version 1.0. (See accompanying file
   5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/libs/container for documentation.
   8 //
   9 //////////////////////////////////////////////////////////////////////////////
  10
  11 //[doc_move_containers
  12 #include <boost/container/vector.hpp>
  13 #include <boost/move/utility_core.hpp>
  14 #include <cassert>
  15
  16 //Non-copyable class
  17 class non_copyable
  18 {
  19    BOOST_MOVABLE_BUT_NOT_COPYABLE(non_copyable)
  20
  21    public:
  22    non_copyable(){}
  23    non_copyable(BOOST_RV_REF(non_copyable)) {}
  24    non_copyable& operator=(BOOST_RV_REF(non_copyable)) { return *this; }
  25 };
  26
  27 int main ()
  28 {
  29    using namespace boost::container;
  30
  31    //Store non-copyable objects in a vector
  32    vector<non_copyable> v;
  33    non_copyable nc;
  34    v.push_back(boost::move(nc));
  35    assert(v.size() == 1);
  36
  37    //Reserve no longer needs copy-constructible
  38    v.reserve(100);
  39    assert(v.capacity() >= 100);
  40
  41    //This resize overload only needs movable and default constructible
  42    v.resize(200);
  43    assert(v.size() == 200);
  44
  45    //Containers are also movable
  46    vector<non_copyable> v_other(boost::move(v));
  47    assert(v_other.size() == 200);
  48    assert(v.empty());
  49
  50    return 0;
  51 }
  52 //]