mirror of
https://github.com/ThePhD/sol2.git
synced 2024-03-22 13:10:44 +08:00
37c3883eb6
now are usable as functions for userdata. allows free functions and lambdas to provide useful operations, like operator+*-/ and other things which may not be implemented as class members.
320 lines
10 KiB
C++
320 lines
10 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 "tuple.hpp"
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#include <type_traits>
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#include <functional>
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namespace sol {
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template<typename T>
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struct identity { typedef T type; };
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template<typename... Args>
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struct is_tuple : std::false_type{ };
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template<typename... Args>
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struct is_tuple<std::tuple<Args...>> : std::true_type{ };
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template<typename T>
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struct unwrap {
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typedef T type;
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};
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template<typename T>
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struct unwrap<std::reference_wrapper<T>> {
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typedef typename std::add_lvalue_reference<T>::type type;
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};
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template<typename T>
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struct remove_member_pointer;
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template<typename R, typename T>
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struct remove_member_pointer<R T::*> {
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typedef R type;
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};
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template<typename T, template<typename...> class Templ>
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struct is_specialization_of : std::false_type { };
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template<typename... T, template<typename...> class Templ>
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struct is_specialization_of<Templ<T...>, Templ> : std::true_type { };
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template<class T, class...>
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struct are_same : std::true_type { };
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template<class T, class U, class... Args>
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struct are_same<T, U, Args...> : std::integral_constant <bool, std::is_same<T, U>::value && are_same<T, Args...>::value> { };
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template<typename T>
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using Type = typename T::type;
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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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using Not = Bool<!T::value>;
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template<typename Condition, typename Then, typename Else>
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using If = typename std::conditional<Condition::value, Then, Else>::type;
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template<typename Condition, typename Then, typename Else>
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using TypeIf = typename std::conditional<Condition::value, Type<Then>, Type<Else>>::type;
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template<typename... Args>
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struct And : Bool<true> {};
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template<typename T, typename... Args>
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struct And<T, Args...> : If<T, And<Args...>, Bool<false>> {};
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template<typename... Args>
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struct Or : Bool<true> {};
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template<typename T, typename... Args>
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struct Or<T, Args...> : If<T, Bool<true>, Or<Args...>> {};
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template<typename... Args>
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using EnableIf = typename std::enable_if<And<Args...>::value, int>::type;
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template<typename... Args>
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using DisableIf = typename std::enable_if<Not<And<Args...>>::value, int>::type;
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template<typename T>
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using Unqualified = typename std::remove_cv<typename std::remove_reference<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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template<typename T>
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using Unwrap = typename unwrap<T>::type;
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template<typename... Args>
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struct return_type {
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typedef std::tuple<Args...> type;
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};
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template<typename T>
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struct return_type<T> {
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typedef T type;
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};
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template<>
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struct return_type<> : types<>{
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typedef void type;
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};
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namespace detail {
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template<typename T, bool isclass = std::is_class<Unqualified<T>>::value>
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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, true> {
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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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namespace detail {
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template<class F>
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struct check_deducible_signature {
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template<class G>
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static auto test( int ) -> decltype( &G::operator(), void( ) );
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template<class>
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static auto test( ... ) -> struct nat;
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using type = std::is_void < decltype( test<F>( 0 ) ) > ;
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};
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} // detail
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template<class F>
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struct has_deducible_signature : detail::check_deducible_signature<F>::type { };
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template<typename T>
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using has_deducible_signature_t = typename has_deducible_signature<T>::type;
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template<typename T>
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struct Function : Bool<detail::is_function_impl<T>::value> {};
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namespace detail {
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template<typename Signature, bool b = std::is_class<Signature>::value>
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struct fx_traits;
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template<typename Signature>
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struct fx_traits<Signature, true> : fx_traits<decltype(Signature::operator()), false> {
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};
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template<typename T, typename R, typename... Args>
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struct fx_traits<R(T::*)(Args...), false> {
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static const std::size_t arity = sizeof...(Args);
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static const bool is_member_function = true;
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typedef std::tuple<Args...> arg_tuple_type;
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typedef types<Args...> args_type;
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typedef R(T::* function_pointer_type)(Args...);
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typedef typename std::remove_pointer<function_pointer_type>::type function_type;
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typedef R(*free_function_pointer_type)(Args...);
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typedef R return_type;
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typedef typename std::remove_pointer<free_function_pointer_type>::type signature_type;
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template<std::size_t i>
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using arg = typename std::tuple_element<i, arg_tuple_type>::type;
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};
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template<typename T, typename R, typename... Args>
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struct fx_traits<R(T::*)(Args...) const, false> {
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static const std::size_t arity = sizeof...(Args);
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static const bool is_member_function = true;
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typedef std::tuple<Args...> arg_tuple_type;
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typedef types<Args...> args_type;
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typedef R(T::* function_pointer_type)(Args...);
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typedef typename std::remove_pointer<function_pointer_type>::type function_type;
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typedef R(*free_function_pointer_type)(Args...);
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typedef R return_type;
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typedef typename std::remove_pointer<free_function_pointer_type>::type signature_type;
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template<std::size_t i>
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using arg = typename std::tuple_element<i, arg_tuple_type>::type;
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};
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template<typename R, typename... Args>
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struct fx_traits<R(Args...), false> {
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static const std::size_t arity = sizeof...(Args);
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static const bool is_member_function = false;
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typedef std::tuple<Args...> arg_tuple_type;
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typedef types<Args...> args_type;
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typedef R(function_type)(Args...);
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typedef R(*function_pointer_type)(Args...);
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typedef R(*free_function_pointer_type)(Args...);
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typedef R return_type;
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typedef typename std::remove_pointer<free_function_pointer_type>::type signature_type;
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template<std::size_t i>
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using arg = typename std::tuple_element<i, arg_tuple_type>::type;
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};
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template<typename R, typename... Args>
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struct fx_traits<R(*)(Args...), false> {
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static const std::size_t arity = sizeof...(Args);
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static const bool is_member_function = false;
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typedef std::tuple<Args...> arg_tuple_type;
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typedef types<Args...> args_type;
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typedef R(function_type)(Args...);
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typedef R(*function_pointer_type)(Args...);
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typedef R(*free_function_pointer_type)(Args...);
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typedef R return_type;
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typedef typename std::remove_pointer<free_function_pointer_type>::type signature_type;
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template<std::size_t i>
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using arg = typename std::tuple_element<i, arg_tuple_type>::type;
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};
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} // detail
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template<typename Signature>
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struct function_traits : detail::fx_traits<Signature> {};
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template<typename Signature>
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using function_args_t = typename function_traits<Signature>::args_type;
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template<typename Signature>
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using function_signature_t = typename function_traits<Signature>::signature_type;
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template<typename Signature>
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using function_return_t = typename function_traits<Signature>::return_type;
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namespace detail {
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template<typename Signature, bool b = std::is_member_object_pointer<Signature>::value>
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struct member_traits : function_traits<Signature> {
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};
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template<typename Signature>
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struct member_traits<Signature, true> {
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typedef typename remove_member_pointer<Signature>::type Arg;
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typedef typename remove_member_pointer<Signature>::type R;
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typedef Signature signature_type;
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static const bool is_member_function = false;
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static const std::size_t arity = 1;
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typedef std::tuple<Arg> arg_tuple_type;
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typedef types<Arg> args_type;
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typedef R return_type;
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typedef R(function_type)(Arg);
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typedef R(*function_pointer_type)(Arg);
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typedef R(*free_function_pointer_type)(Arg);
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template<std::size_t i>
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using arg = typename std::tuple_element<i, arg_tuple_type>::type;
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};
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} // detail
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template<typename Signature>
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struct member_traits : detail::member_traits<Signature> {
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};
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struct has_begin_end_impl {
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template<typename T, typename U = Unqualified<T>,
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typename B = decltype(std::declval<U&>().begin()),
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typename E = decltype(std::declval<U&>().end())>
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static std::true_type test(int);
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template<typename...>
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static std::false_type test(...);
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};
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template<typename T>
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struct has_begin_end : decltype(has_begin_end_impl::test<T>(0)) {};
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struct has_key_value_pair_impl {
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template<typename T, typename U = Unqualified<T>,
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typename V = typename U::value_type,
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typename F = decltype(std::declval<V&>().first),
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typename S = decltype(std::declval<V&>().second)>
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static std::true_type test(int);
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template<typename...>
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static std::false_type test(...);
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};
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template<typename T>
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struct has_key_value_pair : decltype(has_key_value_pair_impl::test<T>(0)) {};
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template<typename T>
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auto unwrapper(T&& item) -> decltype(std::forward<T>(item)) {
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return std::forward<T>(item);
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}
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template<typename Arg>
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Unwrap<Arg> unwrapper(std::reference_wrapper<Arg> arg) {
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return arg.get();
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}
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} // sol
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#endif // SOL_TRAITS_HPP
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