/usr/include/boost/multi_index/detail
Edit: /usr/include/boost/multi_index/detail/auto_space.hpp (2907B)
/* Copyright 2003-2020 Joaquin M Lopez Munoz.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*
* See http://www.boost.org/libs/multi_index for library home page.
*/
#ifndef BOOST_MULTI_INDEX_DETAIL_AUTO_SPACE_HPP
#define BOOST_MULTI_INDEX_DETAIL_AUTO_SPACE_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include
/* keep it first to prevent nasty warns in MSVC */
#include
#include
#include
#include
#include
#include
namespace boost{
namespace multi_index{
namespace detail{
/* auto_space provides uninitialized space suitably to store
* a given number of elements of a given type.
*/
/* NB: it is not clear whether using an allocator to handle
* zero-sized arrays of elements is conformant or not. GCC 3.3.1
* and prior fail here, other stdlibs handle the issue gracefully.
* To be on the safe side, the case n==0 is given special treatment.
* References:
* GCC Bugzilla, "standard allocator crashes when deallocating segment
* "of zero length", http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14176
* C++ Standard Library Defect Report List (Revision 28), issue 199
* "What does allocate(0) return?",
* http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#199
*/
template >
struct auto_space:private noncopyable
{
typedef typename rebind_alloc_for<
Allocator,T>
::type allocator;
typedef allocator_traits alloc_traits;
typedef typename alloc_traits::pointer pointer;
typedef typename alloc_traits::size_type size_type;
explicit auto_space(const Allocator& al=Allocator(),size_type n=1):
al_(al),n_(n),data_(n_?alloc_traits::allocate(al_,n_):pointer(0))
{}
~auto_space(){if(n_)alloc_traits::deallocate(al_,data_,n_);}
Allocator get_allocator()const{return al_;}
pointer data()const{return data_;}
void swap(auto_space& x)
{
swap(
x,
boost::integral_constant<
bool,alloc_traits::propagate_on_container_swap::value>());
}
void swap(auto_space& x,boost::true_type /* swap_allocators */)
{
adl_swap(al_,x.al_);
std::swap(n_,x.n_);
std::swap(data_,x.data_);
}
void swap(auto_space& x,boost::false_type /* swap_allocators */)
{
std::swap(n_,x.n_);
std::swap(data_,x.data_);
}
private:
allocator al_;
size_type n_;
pointer data_;
};
template
void swap(auto_space& x,auto_space& y)
{
x.swap(y);
}
} /* namespace multi_index::detail */
} /* namespace multi_index */
} /* namespace boost */
#endif