1/*=============================================================================
2 Copyright (c) 2016 Paul Fultz II
3 function_param_limit.hpp
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6==============================================================================*/
7
8#ifndef BOOST_HOF_GUARD_FUNCTION_PARAM_LIMIT_HPP
9#define BOOST_HOF_GUARD_FUNCTION_PARAM_LIMIT_HPP
10
11/// function_param_limit
12/// ====================
13///
14/// Description
15/// -----------
16///
17/// The `function_param_limit` metafunction retrieves the maximum number of
18/// parameters for a function. For function pointers it returns the number of
19/// parameters. Everything else, it returns `SIZE_MAX`, but this can be
20/// changed by annotating the function with the [`limit`](limit) decorator.
21///
22/// This is a type trait that inherits from `std::integral_constant`.
23///
24/// Synopsis
25/// --------
26///
27/// template<class F>
28/// struct function_param_limit
29/// : std::integral_constant<std::size_t, ...>
30/// {};
31///
32/// See Also
33/// --------
34///
35/// * [Partial function evaluation](<Partial function evaluation>)
36/// * [limit](limit)
37///
38
39#include <boost/hof/detail/holder.hpp>
40#include <type_traits>
41#include <cstdint>
42
43namespace boost { namespace hof {
44
45template<class F, class=void>
46struct function_param_limit
47: std::integral_constant<std::size_t, SIZE_MAX>
48{};
49
50template<class F>
51struct function_param_limit<F, typename detail::holder<typename F::fit_function_param_limit>::type>
52: F::fit_function_param_limit
53{};
54
55}} // namespace boost::hof
56
57#endif
58

source code of boost/libs/hof/include/boost/hof/function_param_limit.hpp