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90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
/*
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@Copyright Barrett Adair 2015-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_CLBL_TRTS_ADD_VARARGS_HPP
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#define BOOST_CLBL_TRTS_ADD_VARARGS_HPP
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#include <boost/callable_traits/detail/core.hpp>
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namespace boost { namespace callable_traits {
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//[ add_varargs_hpp
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/*`
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[section:ref_add_varargs add_varargs]
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[heading Header]
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``#include <boost/callable_traits/add_varargs.hpp>``
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[heading Definition]
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*/
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template<typename T>
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using add_varargs_t = //see below
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//<-
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detail::try_but_fail_if_invalid<
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typename detail::traits<T>::add_varargs,
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varargs_are_illegal_for_this_type>;
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namespace detail {
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template<typename T, typename = std::false_type>
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struct add_varargs_impl {};
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template<typename T>
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struct add_varargs_impl <T, typename std::is_same<
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add_varargs_t<T>, detail::dummy>::type>
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{
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using type = add_varargs_t<T>;
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};
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}
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//->
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template<typename T>
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struct add_varargs : detail::add_varargs_impl<T> {};
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//<-
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}} // namespace boost::callable_traits
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//->
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/*`
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[heading Constraints]
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* `T` must be one of the following:
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* function type
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* function pointer type
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* function reference type
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* member function pointer type
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* If `T` is a pointer, it may not be cv/ref qualified
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[heading Behavior]
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* A substitution failure occurs if the constraints are violated.
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* Adds C-style variadics (`...`) to the signature of `T`, if not already present.
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[heading Input/Output Examples]
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[table
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[[`T`] [`add_varargs_t<T>`]]
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[[`int()`] [`int(...)`]]
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[[`int(int)`] [`int(int, ...)`]]
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[[`int (&)()`] [`int(&)(...)`]]
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[[`int (*)()`] [`int(*)(...)`]]
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[[`int (*)(...)`] [`int(*)(...)`]]
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[[`int(foo::*)()`] [`int(foo::*)(...)`]]
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[[`int(foo::*)() &`] [`int(foo::*)(...) &`]]
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[[`int(foo::*)() &&`] [`int(foo::*)(...) &&`]]
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[[`int(foo::*)() const`] [`int(foo::*)(...) const`]]
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[[`int(foo::*)() transaction_safe`] [`int(foo::*)(...) transaction_safe`]]
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[[`int`] [(substitution failure)]]
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[[`int foo::*`] [(substitution failure)]]
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[[`int (*&)()`] [(substitution failure)]]
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]
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[heading Example Program]
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[import ../example/add_varargs.cpp]
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[add_varargs]
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[endsect]
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*/
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//]
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#endif
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