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0001 /*============================================================================= 0002 Copyright (c) 2016 Paul Fultz II 0003 function_param_limit.hpp 0004 Distributed under the Boost Software License, Version 1.0. (See accompanying 0005 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 0006 ==============================================================================*/ 0007 0008 #ifndef BOOST_HOF_GUARD_FUNCTION_PARAM_LIMIT_HPP 0009 #define BOOST_HOF_GUARD_FUNCTION_PARAM_LIMIT_HPP 0010 0011 /// function_param_limit 0012 /// ==================== 0013 /// 0014 /// Description 0015 /// ----------- 0016 /// 0017 /// The `function_param_limit` metafunction retrieves the maximum number of 0018 /// parameters for a function. For function pointers it returns the number of 0019 /// parameters. Everything else, it returns `SIZE_MAX`, but this can be 0020 /// changed by annotating the function with the [`limit`](limit) decorator. 0021 /// 0022 /// This is a type trait that inherits from `std::integral_constant`. 0023 /// 0024 /// Synopsis 0025 /// -------- 0026 /// 0027 /// template<class F> 0028 /// struct function_param_limit 0029 /// : std::integral_constant<std::size_t, ...> 0030 /// {}; 0031 /// 0032 /// See Also 0033 /// -------- 0034 /// 0035 /// * [Partial function evaluation](<Partial function evaluation>) 0036 /// * [limit](limit) 0037 /// 0038 0039 #include <boost/hof/detail/holder.hpp> 0040 #include <type_traits> 0041 #include <cstdint> 0042 0043 namespace boost { namespace hof { 0044 0045 template<class F, class=void> 0046 struct function_param_limit 0047 : std::integral_constant<std::size_t, SIZE_MAX> 0048 {}; 0049 0050 template<class F> 0051 struct function_param_limit<F, typename detail::holder<typename F::fit_function_param_limit>::type> 0052 : F::fit_function_param_limit 0053 {}; 0054 0055 }} // namespace boost::hof 0056 0057 #endif
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