Symaptic: os/ossrv/ossrv_pub/boost_apis/boost/python/ptr.hpp@260cb5ec6c19

     1 #ifndef PTR_DWA20020601_HPP

     2 # define PTR_DWA20020601_HPP

     4 # include <boost/python/detail/prefix.hpp>

     5 // Copyright David Abrahams 2002.

     6 // Distributed under the Boost Software License, Version 1.0. (See

     7 // accompanying file LICENSE_1_0.txt or copy at

     8 // http://www.boost.org/LICENSE_1_0.txt)

     9 //

    10 // Based on boost/ref.hpp, thus:

    11 //  Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)

    12 //  Copyright (C) 2001 Peter Dimov

    14 # if _MSC_VER+0 >= 1020

    15 #  pragma once

    16 # endif

    18 # include <boost/config.hpp>

    19 # include <boost/mpl/bool.hpp>

    21 namespace boost { namespace python {

    23 template<class Ptr> class pointer_wrapper

    24 {

    25  public:

    26     typedef Ptr type;

    28     explicit pointer_wrapper(Ptr x): p_(x) {}

    29     operator Ptr() const { return p_; }

    30     Ptr get() const { return p_; }

    31  private:

    32     Ptr p_;

    33 };

    35 template<class T>

    36 inline pointer_wrapper<T> ptr(T t)

    37 {

    38     return pointer_wrapper<T>(t);

    39 }

    41 # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

    42 template<typename T>

    43 class is_pointer_wrapper

    44     : public mpl::false_

    45 {

    46 };

    48 template<typename T>

    49 class is_pointer_wrapper<pointer_wrapper<T> >

    50     : public mpl::true_

    51 {

    52 };

    54 template<typename T>

    55 class unwrap_pointer

    56 {

    57  public:

    58     typedef T type;

    59 };

    61 template<typename T>

    62 class unwrap_pointer<pointer_wrapper<T> >

    63 {

    64  public:

    65     typedef T type;

    66 };

    67 # else // no partial specialization

    69 }} // namespace boost::python

    71 #include <boost/type.hpp>

    73 namespace boost { namespace python {

    75 namespace detail

    76 {

    77   typedef char (&yes_pointer_wrapper_t)[1];

    78   typedef char (&no_pointer_wrapper_t)[2];

    80   no_pointer_wrapper_t is_pointer_wrapper_test(...);

    82   template<typename T>

    83   yes_pointer_wrapper_t is_pointer_wrapper_test(boost::type< pointer_wrapper<T> >);

    85   template<bool wrapped>

    86   struct pointer_unwrapper

    87   {

    88       template <class T>

    89       struct apply

    90       {

    91           typedef T type;

    92       };

    93   };

    95   template<>

    96   struct pointer_unwrapper<true>

    97   {

    98       template <class T>

    99       struct apply

   100       {

   101           typedef typename T::type type;

   102       };

   103   };

   104 }

   106 template<typename T>

   107 class is_pointer_wrapper

   108 {

   109  public:

   110     BOOST_STATIC_CONSTANT(

   111         bool, value = (

   112         sizeof(detail::is_pointer_wrapper_test(boost::type<T>()))

   113             == sizeof(detail::yes_pointer_wrapper_t)));

   114     typedef mpl::bool_<value> type;

   115 };

   117 template <typename T>

   118 class unwrap_pointer

   119     : public detail::pointer_unwrapper<

   120         is_pointer_wrapper<T>::value

   121       >::template apply<T>

   122 {};

   124 # endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

   126 }} // namespace boost::python

   128 #endif // #ifndef PTR_DWA20020601_HPP

author	sl
	Tue, 10 Jun 2014 14:32:02 +0200
changeset 1	260cb5ec6c19
permissions	-rw-r--r--