ceph/src/boost/boost/container/uses_allocator_fwd.hpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2015-2015. 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 #ifndef BOOST_CONTAINER_USES_ALLOCATOR_FWD_HPP
  12 #define BOOST_CONTAINER_USES_ALLOCATOR_FWD_HPP
  13
  14 #include <boost/container/detail/workaround.hpp>
  15 #include <boost/container/detail/std_fwd.hpp>
  16
  17 //! \file
  18 //!   This header forward declares boost::container::constructible_with_allocator_prefix,
  19 //!   boost::container::constructible_with_allocator_suffix and
  20 //!   boost::container::uses_allocator. Also defines the following types:
  21
  22 namespace boost {
  23 namespace container {
  24
  25 #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
  26
  27    template <int Dummy = 0>
  28    struct std_allocator_arg_holder
  29    {
  30       static ::std::allocator_arg_t *dummy;
  31    };
  32
  33    template <int Dummy>                                             //Silence null-reference compiler warnings
  34    ::std::allocator_arg_t *std_allocator_arg_holder<Dummy>::dummy = reinterpret_cast< ::std::allocator_arg_t * >(0x1234);
  35
  36 typedef const std::allocator_arg_t & allocator_arg_t;
  37
  38 #else
  39
  40 //! The allocator_arg_t struct is an empty structure type used as a unique type to
  41 //! disambiguate constructor and function overloading. Specifically, several types
  42 //! have constructors with allocator_arg_t as the first argument, immediately followed
  43 //! by an argument of a type that satisfies Allocator requirements
  44 typedef unspecified allocator_arg_t;
  45
  46 #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
  47
  48 //! The `erased_type` struct is an empty struct that serves as a placeholder for a type
  49 //! T in situations where the actual type T is determined at runtime. For example,
  50 //! the nested type, `allocator_type`, is an alias for `erased_type` in classes that
  51 //! use type-erased allocators.
  52 struct erased_type {};
  53
  54 //! A instance of type
  55 //! allocator_arg_t
  56 static allocator_arg_t allocator_arg = BOOST_CONTAINER_DOC1ST(unspecified, *std_allocator_arg_holder<>::dummy);
  57
  58 // @cond
  59
  60 template <class T>
  61 struct constructible_with_allocator_suffix;
  62
  63 template <class T>
  64 struct constructible_with_allocator_prefix;
  65
  66 template <typename T, typename Allocator>
  67 struct uses_allocator;
  68
  69 // @endcond
  70
  71 }} // namespace boost { namespace container {
  72
  73 #endif   //BOOST_CONTAINER_USES_ALLOCATOR_HPP