ctx.hpp

#ifndef ENTT_META_CTX_HPP
#define ENTT_META_CTX_HPP
 
#include "../config/config.h"
#include "../core/attribute.h"
 
namespace entt {
 
namespace internal {
 
struct meta_type_node;
 
struct ENTT_API meta_context {
    // we could use the lines below but VS2017 returns with an ICE if combined with ENTT_API despite the code being valid C++
    //     inline static meta_type_node *local = nullptr;
    //     inline static meta_type_node **global = &local;
 
    [[nodiscard]] static meta_type_node *&local() ENTT_NOEXCEPT {
        static meta_type_node *chain = nullptr;
        return chain;
    }
 
    [[nodiscard]] static meta_type_node **&global() ENTT_NOEXCEPT {
        static meta_type_node **chain = &local();
        return chain;
    }
};
 
} // namespace internal
 
struct meta_ctx {
    static void bind(meta_ctx other) ENTT_NOEXCEPT {
        internal::meta_context::global() = other.ctx;
    }
 
private:
    internal::meta_type_node **ctx{&internal::meta_context::local()};
};
 
} // namespace entt
 
#endif