ceph/src/boost/boost/callable_traits/add_varargs.hpp

   1 /*
   2
   3 @Copyright Barrett Adair 2015-2017
   4 Distributed under the Boost Software License, Version 1.0.
   5 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   6
   7 */
   8
   9 #ifndef BOOST_CLBL_TRTS_ADD_VARARGS_HPP
  10 #define BOOST_CLBL_TRTS_ADD_VARARGS_HPP
  11
  12 #include <boost/callable_traits/detail/core.hpp>
  13
  14 namespace boost { namespace callable_traits {
  15
  16 //[ add_varargs_hpp
  17 /*`
  18 [section:ref_add_varargs add_varargs]
  19 [heading Header]
  20 ``#include <boost/callable_traits/add_varargs.hpp>``
  21 [heading Definition]
  22 */
  23
  24 template<typename T>
  25 using add_varargs_t = //see below
  26 //<-
  27     detail::try_but_fail_if_invalid<
  28         typename detail::traits<T>::add_varargs,
  29         varargs_are_illegal_for_this_type>;
  30
  31 namespace detail {
  32
  33     template<typename T, typename = std::false_type>
  34     struct add_varargs_impl {};
  35
  36     template<typename T>
  37     struct add_varargs_impl <T, typename std::is_same<
  38         add_varargs_t<T>, detail::dummy>::type>
  39     {
  40         using type = add_varargs_t<T>;
  41     };
  42 }
  43 //->
  44
  45 template<typename T>
  46 struct add_varargs : detail::add_varargs_impl<T> {};
  47
  48 //<-
  49 }} // namespace boost::callable_traits
  50 //->
  51
  52 /*`
  53 [heading Constraints]
  54 * `T` must be one of the following:
  55   * function type
  56   * function pointer type
  57   * function reference type
  58   * member function pointer type
  59 * If `T` is a pointer, it may not be cv/ref qualified
  60
  61 [heading Behavior]
  62 * A substitution failure occurs if the constraints are violated.
  63 * Adds C-style variadics (`...`) to the signature of `T`, if not already present.
  64
  65 [heading Input/Output Examples]
  66 [table
  67     [[`T`]                              [`add_varargs_t<T>`]]
  68     [[`int()`]                          [`int(...)`]]
  69     [[`int(int)`]                          [`int(int, ...)`]]
  70     [[`int (&)()`]                      [`int(&)(...)`]]
  71     [[`int (*)()`]                      [`int(*)(...)`]]
  72     [[`int (*)(...)`]                   [`int(*)(...)`]]
  73     [[`int(foo::*)()`]                  [`int(foo::*)(...)`]]
  74     [[`int(foo::*)() &`]                [`int(foo::*)(...) &`]]
  75     [[`int(foo::*)() &&`]               [`int(foo::*)(...) &&`]]
  76     [[`int(foo::*)() const`]            [`int(foo::*)(...) const`]]
  77     [[`int(foo::*)() transaction_safe`] [`int(foo::*)(...) transaction_safe`]]
  78     [[`int`]                            [(substitution failure)]]
  79     [[`int foo::*`]                     [(substitution failure)]]
  80     [[`int (*&)()`]                     [(substitution failure)]]
  81 ]
  82
  83 [heading Example Program]
  84 [import ../example/add_varargs.cpp]
  85 [add_varargs]
  86 [endsect]
  87 */
  88 //]
  89
  90 #endif