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+// The MIT License (MIT)
+
+// Copyright (c) 2013-2016 Rapptz, ThePhD and contributors
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SOL_REFERENCE_HPP
+#define SOL_REFERENCE_HPP
+
+#include "types.hpp"
+#include "stack_reference.hpp"
+
+namespace sol {
+ namespace stack {
+ template <bool top_level>
+ struct push_popper_n {
+ lua_State* L;
+ int t;
+ push_popper_n(lua_State* L, int x) : L(L), t(x) { }
+ ~push_popper_n() { lua_pop(L, t); }
+ };
+ template <>
+ struct push_popper_n<true> {
+ push_popper_n(lua_State*, int) { }
+ };
+ template <bool top_level, typename T>
+ struct push_popper {
+ T t;
+ push_popper(T x) : t(x) { t.push(); }
+ ~push_popper() { t.pop(); }
+ };
+ template <typename T>
+ struct push_popper<true, T> {
+ push_popper(T) {}
+ ~push_popper() {}
+ };
+ template <bool top_level = false, typename T>
+ push_popper<top_level, T> push_pop(T&& x) {
+ return push_popper<top_level, T>(std::forward<T>(x));
+ }
+ template <bool top_level = false>
+ push_popper_n<top_level> pop_n(lua_State* L, int x) {
+ return push_popper_n<top_level>(L, x);
+ }
+ } // stack
+
+ namespace detail {
+ struct global_tag { } const global_{};
+ } // detail
+
+ class reference {
+ private:
+ lua_State* L = nullptr; // non-owning
+ int ref = LUA_NOREF;
+
+ int copy() const noexcept {
+ if (ref == LUA_NOREF)
+ return LUA_NOREF;
+ push();
+ return luaL_ref(L, LUA_REGISTRYINDEX);
+ }
+
+ protected:
+ reference(lua_State* L, detail::global_tag) noexcept : L(L) {
+ lua_pushglobaltable(L);
+ ref = luaL_ref(L, LUA_REGISTRYINDEX);
+ }
+
+ int stack_index() const noexcept {
+ return -1;
+ }
+
+ public:
+ reference() noexcept = default;
+ reference(nil_t) noexcept : reference() {}
+ reference(const stack_reference& r) noexcept : reference(r.lua_state(), r.stack_index()) {}
+ reference(stack_reference&& r) noexcept : reference(r.lua_state(), r.stack_index()) {}
+ reference(lua_State* L, int index = -1) noexcept : L(L) {
+ lua_pushvalue(L, index);
+ ref = luaL_ref(L, LUA_REGISTRYINDEX);
+ }
+
+ virtual ~reference() noexcept {
+ luaL_unref(L, LUA_REGISTRYINDEX, ref);
+ }
+
+ reference(reference&& o) noexcept {
+ L = o.L;
+ ref = o.ref;
+
+ o.L = nullptr;
+ o.ref = LUA_NOREF;
+ }
+
+ reference& operator=(reference&& o) noexcept {
+ L = o.L;
+ ref = o.ref;
+
+ o.L = nullptr;
+ o.ref = LUA_NOREF;
+
+ return *this;
+ }
+
+ reference(const reference& o) noexcept {
+ L = o.L;
+ ref = o.copy();
+ }
+
+ reference& operator=(const reference& o) noexcept {
+ L = o.L;
+ ref = o.copy();
+ return *this;
+ }
+
+ int push() const noexcept {
+ lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
+ return 1;
+ }
+
+ void pop(int n = 1) const noexcept {
+ lua_pop(lua_state(), n);
+ }
+
+ int registry_index() const noexcept {
+ return ref;
+ }
+
+ bool valid() const noexcept {
+ return !(ref == LUA_NOREF || ref == LUA_REFNIL);
+ }
+
+ explicit operator bool() const noexcept {
+ return valid();
+ }
+
+ type get_type() const noexcept {
+ auto pp = stack::push_pop(*this);
+ int result = lua_type(L, -1);
+ return static_cast<type>(result);
+ }
+
+ lua_State* lua_state() const noexcept {
+ return L;
+ }
+ };
+
+ inline bool operator== (const reference& l, const reference& r) {
+ auto ppl = stack::push_pop(l);
+ auto ppr = stack::push_pop(r);
+ return lua_compare(l.lua_state(), -1, -2, LUA_OPEQ) == 1;
+ }
+
+ inline bool operator!= (const reference& l, const reference& r) {
+ return !operator==(l, r);
+ }
+} // sol
+
+#endif // SOL_REFERENCE_HPP