mirror of
https://github.com/ThePhD/sol2.git
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99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
// sol2
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// The MIT License (MIT)
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// Copyright (c) 2013-2022 Rapptz, ThePhD and contributors
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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_FILTERS_HPP
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#define SOL_FILTERS_HPP
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#include <sol/traits.hpp>
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#include <array>
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namespace sol {
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namespace detail {
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struct policy_base_tag { };
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} // namespace detail
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template <int Target, int... In>
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struct static_stack_dependencies : detail::policy_base_tag { };
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typedef static_stack_dependencies<-1, 1> self_dependency;
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template <int... In>
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struct returns_self_with : detail::policy_base_tag { };
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typedef returns_self_with<> returns_self;
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struct stack_dependencies : detail::policy_base_tag {
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int target;
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std::array<int, 64> stack_indices;
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std::size_t len;
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template <typename... Args>
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stack_dependencies(int stack_target, Args&&... args) : target(stack_target), stack_indices(), len(sizeof...(Args)) {
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std::size_t i = 0;
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(void)detail::swallow { int(), (stack_indices[i++] = static_cast<int>(std::forward<Args>(args)), int())... };
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}
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int& operator[](std::size_t i) {
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return stack_indices[i];
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}
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const int& operator[](std::size_t i) const {
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return stack_indices[i];
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}
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std::size_t size() const {
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return len;
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}
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};
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template <typename F, typename... Policies>
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struct policy_wrapper {
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typedef std::index_sequence_for<Policies...> indices;
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F value;
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std::tuple<Policies...> policies;
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template <typename Fx, typename... Args, meta::enable<meta::neg<std::is_same<meta::unqualified_t<Fx>, policy_wrapper>>> = meta::enabler>
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policy_wrapper(Fx&& fx, Args&&... args) : value(std::forward<Fx>(fx)), policies(std::forward<Args>(args)...) {
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}
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policy_wrapper(const policy_wrapper&) = default;
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policy_wrapper& operator=(const policy_wrapper&) = default;
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policy_wrapper(policy_wrapper&&) = default;
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policy_wrapper& operator=(policy_wrapper&&) = default;
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};
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template <typename F, typename... Args>
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auto policies(F&& f, Args&&... args) {
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return policy_wrapper<std::decay_t<F>, std::decay_t<Args>...>(std::forward<F>(f), std::forward<Args>(args)...);
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}
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namespace detail {
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template <typename T>
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using is_policy = meta::is_specialization_of<T, policy_wrapper>;
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template <typename T>
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inline constexpr bool is_policy_v = is_policy<T>::value;
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} // namespace detail
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} // namespace sol
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#endif // SOL_FILTERS_HPP
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