ceph/src/boost/libs/python/include/boost/python/detail/if_else.hpp

   1 // Copyright David Abrahams 2002.
   2 // Distributed under the Boost Software License, Version 1.0. (See
   3 // accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5 #ifndef IF_ELSE_DWA2002322_HPP
   6 # define IF_ELSE_DWA2002322_HPP
   7 # include <boost/config.hpp>
   8
   9 namespace boost { namespace python { namespace detail {
  10
  11 template <class T> struct elif_selected;
  12
  13 template <class T>
  14 struct if_selected
  15 {
  16     template <bool b>
  17     struct elif : elif_selected<T>
  18     {
  19     };
  20
  21     template <class U>
  22     struct else_
  23     {
  24         typedef T type;
  25     };
  26 };
  27
  28 template <class T>
  29 struct elif_selected
  30 {
  31 # if !(defined(__MWERKS__) && __MWERKS__ <= 0x2407)
  32     template <class U> class then;
  33 # else
  34     template <class U>
  35     struct then : if_selected<T>
  36     {
  37     };
  38 # endif
  39 };
  40
  41 # if !(defined(__MWERKS__) && __MWERKS__ <= 0x2407)
  42 template <class T>
  43 template <class U>
  44 class elif_selected<T>::then : public if_selected<T>
  45 {
  46 };
  47 # endif
  48
  49 template <bool b> struct if_
  50 {
  51     template <class T>
  52     struct then : if_selected<T>
  53     {
  54     };
  55 };
  56
  57 struct if_unselected
  58 {
  59     template <bool b> struct elif : if_<b>
  60     {
  61     };
  62
  63     template <class U>
  64     struct else_
  65     {
  66         typedef U type;
  67     };
  68 };
  69
  70 template <>
  71 struct if_<false>
  72 {
  73     template <class T>
  74     struct then : if_unselected
  75     {
  76     };
  77 };
  78
  79 }}} // namespace boost::python::detail
  80
  81 #endif // IF_ELSE_DWA2002322_HPP