Attempt to represent the S^2->S^3 header reorganisation as a series of "hg rename" operations
1 /* Copyright 2003-2005 Joaquín M López Muñoz.
2 * Distributed under the Boost Software License, Version 1.0.
3 * (See accompanying file LICENSE_1_0.txt or copy at
4 * http://www.boost.org/LICENSE_1_0.txt)
6 * See http://www.boost.org/libs/multi_index for library home page.
9 #ifndef BOOST_MULTI_INDEX_DETAIL_AUTO_SPACE_HPP
10 #define BOOST_MULTI_INDEX_DETAIL_AUTO_SPACE_HPP
12 #if defined(_MSC_VER)&&(_MSC_VER>=1200)
16 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
18 #include <boost/detail/allocator_utilities.hpp>
19 #include <boost/noncopyable.hpp>
24 namespace multi_index{
28 /* auto_space provides uninitialized space suitably to store
29 * a given number of elements of a given type.
32 /* NB: it is not clear whether using an allocator to handle
33 * zero-sized arrays of elements is conformant or not. GCC 3.3.1
34 * and prior fail here, other stdlibs handle the issue gracefully.
35 * To be on the safe side, the case n==0 is given special treatment.
37 * GCC Bugzilla, "standard allocator crashes when deallocating segment
38 * "of zero length", http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14176
39 * C++ Standard Library Defect Report List (Revision 28), issue 199
40 * "What does allocate(0) return?",
41 * http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-defects.html#199
44 template<typename T,typename Allocator=std::allocator<T> >
45 struct auto_space:private noncopyable
47 explicit auto_space(const Allocator& al=Allocator(),std::size_t n=1):
48 al_(al),n_(n),data_(n_?al_.allocate(n_):0)
53 if(n_)al_.deallocate(data_,n_);
56 Allocator get_allocator()const{return al_;}
58 T* data()const{return data_;}
60 void swap(auto_space& x)
63 std::swap(data_,x.data_);
67 typename boost::detail::allocator::rebind_to<
68 Allocator,T>::type al_;
73 template<typename T,typename Allocator>
74 void swap(auto_space<T,Allocator>& x,auto_space<T,Allocator>& y)
79 } /* namespace multi_index::detail */
81 } /* namespace multi_index */
83 } /* namespace boost */