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72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
// The MIT License (MIT)
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// Copyright (c) 2013 Danny Y., Rapptz
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_TRAITS_HPP
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#define SOL_TRAITS_HPP
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#include <type_traits>
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namespace sol {
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template<typename T, typename R = void>
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using EnableIf = typename std::enable_if<T::value, R>::type;
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template<typename T, typename R = void>
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using DisableIf = typename std::enable_if<!T::value, R>::type;
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template<typename T>
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using Unqualified = typename std::remove_reference<typename std::remove_cv<T>::type>::type;
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template<typename T>
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using Decay = typename std::decay<T>::type;
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namespace detail {
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// code borrowed from Gears
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// https://github.com/Rapptz/Gears/
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template<typename T, typename = void>
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struct is_function_impl : std::is_function<typename std::remove_pointer<T>::type> {};
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template<typename T>
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struct is_function_impl<T, EnableIf<std::is_class<Unqualified<T>>>> {
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using yes = char;
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using no = struct { char s[2]; };
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struct F { void operator()(); };
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struct Derived : T, F { };
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template<typename U, U> struct Check;
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template<typename V>
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static no test(Check<void (F::*)(), &V::operator()>*);
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template<typename>
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static yes test(...);
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static const bool value = sizeof(test<Derived>(0)) == sizeof(yes);
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};
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} // detail
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template<bool B>
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using Bool = std::integral_constant<bool, B>;
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template<typename T>
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struct Function : Bool<detail::is_function_impl<T>::value> {};
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} // sol
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#endif // SOL_TRAITS_HPP
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