mirror of
https://github.com/ThePhD/sol2.git
synced 2024-03-22 13:10:44 +08:00
750 lines
19 KiB
C++
750 lines
19 KiB
C++
// sol3
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// The MIT License (MIT)
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// Copyright (c) 2013-2019 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_REFERENCE_HPP
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#define SOL_REFERENCE_HPP
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#include <sol/types.hpp>
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#include <sol/stack_reference.hpp>
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#include <functional>
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namespace sol {
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namespace detail {
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inline const char (&default_main_thread_name())[9] {
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static const char name[9] = "sol.\xF0\x9F\x93\x8C";
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return name;
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}
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} // namespace detail
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namespace stack {
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inline void remove(lua_State* L, int rawindex, int count) {
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if (count < 1)
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return;
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int top = lua_gettop(L);
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if (top < 1) {
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return;
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}
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if (rawindex == -count || top == rawindex) {
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// Slice them right off the top
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lua_pop(L, static_cast<int>(count));
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return;
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}
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// Remove each item one at a time using stack operations
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// Probably slower, maybe, haven't benchmarked,
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// but necessary
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int index = lua_absindex(L, rawindex);
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if (index < 0) {
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index = lua_gettop(L) + (index + 1);
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}
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int last = index + count;
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for (int i = index; i < last; ++i) {
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lua_remove(L, index);
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}
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}
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struct push_popper_at {
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lua_State* L;
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int index;
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int count;
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push_popper_at(lua_State* luastate, int index = -1, int count = 1)
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: L(luastate), index(index), count(count) {
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}
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~push_popper_at() {
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remove(L, index, count);
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}
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};
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template <bool top_level>
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struct push_popper_n {
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lua_State* L;
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int t;
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push_popper_n(lua_State* luastate, int x)
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: L(luastate), t(x) {
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}
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push_popper_n(const push_popper_n&) = delete;
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push_popper_n(push_popper_n&&) = default;
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push_popper_n& operator=(const push_popper_n&) = delete;
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push_popper_n& operator=(push_popper_n&&) = default;
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~push_popper_n() {
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lua_pop(L, t);
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}
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};
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template <>
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struct push_popper_n<true> {
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push_popper_n(lua_State*, int) {
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}
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};
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template <bool, typename T, typename = void>
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struct push_popper {
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using Tu = meta::unqualified_t<T>;
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T t;
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int idx;
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push_popper(T x)
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: t(x), idx(lua_absindex(t.lua_state(), -t.push())) {
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}
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int index_of(const Tu&) {
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return idx;
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}
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~push_popper() {
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t.pop();
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}
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};
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template <typename T, typename C>
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struct push_popper<true, T, C> {
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using Tu = meta::unqualified_t<T>;
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push_popper(T) {
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}
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int index_of(const Tu&) {
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return -1;
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}
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~push_popper() {
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}
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};
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template <typename T>
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struct push_popper<false, T, std::enable_if_t<is_stack_based_v<meta::unqualified_t<T>>>> {
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using Tu = meta::unqualified_t<T>;
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push_popper(T) {
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}
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int index_of(const Tu& r) {
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return r.stack_index();
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}
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~push_popper() {
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}
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};
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template <bool top_level = false, typename T>
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push_popper<top_level, T> push_pop(T&& x) {
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return push_popper<top_level, T>(std::forward<T>(x));
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}
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template <typename T>
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push_popper_at push_pop_at(T&& x) {
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int c = x.push();
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lua_State* L = x.lua_state();
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return push_popper_at(L, lua_absindex(L, -c), c);
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}
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template <bool top_level = false>
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push_popper_n<top_level> pop_n(lua_State* L, int x) {
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return push_popper_n<top_level>(L, x);
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}
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} // namespace stack
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inline lua_State* main_thread(lua_State* L, lua_State* backup_if_unsupported = nullptr) {
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#if SOL_LUA_VERSION < 502
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if (L == nullptr)
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return backup_if_unsupported;
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lua_getglobal(L, detail::default_main_thread_name());
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auto pp = stack::pop_n(L, 1);
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if (type_of(L, -1) == type::thread) {
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return lua_tothread(L, -1);
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}
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return backup_if_unsupported;
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#else
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if (L == nullptr)
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return backup_if_unsupported;
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lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_MAINTHREAD);
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lua_State* Lmain = lua_tothread(L, -1);
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lua_pop(L, 1);
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return Lmain;
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#endif // Lua 5.2+ has the main thread unqualified_getter
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}
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namespace detail {
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struct global_tag {
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} const global_ {};
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struct no_safety_tag {
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} const no_safety {};
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template <bool b>
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inline lua_State* pick_main_thread(lua_State* L, lua_State* backup_if_unsupported = nullptr) {
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(void)L;
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(void)backup_if_unsupported;
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if (b) {
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return main_thread(L, backup_if_unsupported);
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}
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return L;
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}
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} // namespace detail
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class stateless_reference {
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private:
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template <bool o_main_only>
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friend class basic_reference;
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int ref = LUA_NOREF;
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int copy(lua_State* L) const noexcept {
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if (ref == LUA_NOREF)
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return LUA_NOREF;
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push(L);
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return luaL_ref(L, LUA_REGISTRYINDEX);
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}
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lua_State* copy_assign(lua_State* L, lua_State* rL, const stateless_reference& r) {
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if (valid(L)) {
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deref(L);
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}
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ref = r.copy(L);
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return rL;
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}
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lua_State* move_assign(lua_State* L, lua_State* rL, stateless_reference&& r) {
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if (valid(L)) {
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deref(L);
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}
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ref = r.ref;
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r.ref = LUA_NOREF;
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return rL;
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}
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protected:
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int stack_index () const noexcept {
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return -1;
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}
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stateless_reference(lua_State* L, detail::global_tag) noexcept {
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#if SOL_IS_ON(SOL_SAFE_STACK_CHECK_I_)
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luaL_checkstack(L, 1, "not enough Lua stack space to push this reference value");
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#endif // make sure stack doesn't overflow
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lua_pushglobaltable(L);
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ref = luaL_ref(L, LUA_REGISTRYINDEX);
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}
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stateless_reference(int raw_ref_index) noexcept : ref(raw_ref_index) {
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}
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public:
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stateless_reference() noexcept = default;
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stateless_reference(lua_nil_t) noexcept : stateless_reference() {
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}
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stateless_reference(const stack_reference& r) noexcept : stateless_reference(r.lua_state(), r.stack_index()) {
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}
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stateless_reference(stack_reference&& r) noexcept : stateless_reference(r.lua_state(), r.stack_index()) {
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}
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stateless_reference(lua_State* L, const stateless_reference& r) noexcept {
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if (r.ref == LUA_REFNIL) {
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ref = LUA_REFNIL;
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return;
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}
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if (r.ref == LUA_NOREF || L == nullptr) {
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ref = LUA_NOREF;
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return;
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}
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ref = r.copy(L);
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}
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stateless_reference(lua_State* L, stateless_reference&& r) noexcept {
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if (r.ref == LUA_REFNIL) {
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ref = LUA_REFNIL;
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return;
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}
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if (r.ref == LUA_NOREF || L == nullptr) {
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ref = LUA_NOREF;
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return;
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}
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ref = r.ref;
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r.ref = LUA_NOREF;
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}
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stateless_reference(lua_State* L, const stack_reference& r) noexcept {
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if (L == nullptr || r.lua_state() == nullptr || r.get_type() == type::none) {
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ref = LUA_NOREF;
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return;
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}
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if (r.get_type() == type::lua_nil) {
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ref = LUA_REFNIL;
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return;
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}
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if (L != r.lua_state() && !detail::xmovable(L, r.lua_state())) {
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return;
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}
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r.push(L);
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ref = luaL_ref(L, LUA_REGISTRYINDEX);
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}
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stateless_reference(lua_State* L, int index = -1) noexcept {
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// use L to stick with that state's execution stack
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#if SOL_IS_ON(SOL_SAFE_STACK_CHECK_I_)
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luaL_checkstack(L, 1, "not enough Lua stack space to push this reference value");
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#endif // make sure stack doesn't overflow
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lua_pushvalue(L, index);
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ref = luaL_ref(L, LUA_REGISTRYINDEX);
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}
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stateless_reference(lua_State* L, ref_index index) noexcept {
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lua_rawgeti(L, LUA_REGISTRYINDEX, index.index);
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ref = luaL_ref(L, LUA_REGISTRYINDEX);
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}
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stateless_reference(lua_State*, lua_nil_t) noexcept {
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}
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~stateless_reference() noexcept = default;
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stateless_reference(const stateless_reference& o) noexcept = delete;
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stateless_reference& operator=(const stateless_reference& r) noexcept = delete;
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stateless_reference(stateless_reference&& o) noexcept
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: ref(o.ref) {
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o.ref = LUA_NOREF;
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}
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stateless_reference& operator=(stateless_reference&& o) noexcept {
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ref = o.ref;
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o.ref = LUA_NOREF;
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return *this;
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}
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int push(lua_State* L) const noexcept {
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#if SOL_IS_ON(SOL_SAFE_STACK_CHECK_I_)
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luaL_checkstack(L, 1, "not enough Lua stack space to push this reference value");
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#endif // make sure stack doesn't overflow
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lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
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return 1;
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}
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void pop(lua_State* L, int n = 1) const noexcept {
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lua_pop(L, n);
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}
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int registry_index() const noexcept {
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return ref;
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}
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bool valid(lua_State*) const noexcept {
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return !(ref == LUA_NOREF || ref == LUA_REFNIL);
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}
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const void* pointer(lua_State* L) const noexcept {
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int si = push(L);
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const void* vp = lua_topointer(L, -si);
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lua_pop(L, si);
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return vp;
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}
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type get_type(lua_State* L) const noexcept {
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int p = push(L);
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int result = lua_type(L, -1);
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pop(L, p);
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return static_cast<type>(result);
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}
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void abandon(lua_State* = nullptr) {
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ref = LUA_NOREF;
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}
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void deref(lua_State* L) const noexcept {
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luaL_unref(L, LUA_REGISTRYINDEX, ref);
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}
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};
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template <bool main_only = false>
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class basic_reference : public stateless_reference {
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private:
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template <bool o_main_only>
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friend class basic_reference;
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lua_State* luastate = nullptr; // non-owning
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template <bool r_main_only>
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void copy_assign(const basic_reference<r_main_only>& r) {
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if (valid()) {
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deref();
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}
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if (r.ref == LUA_REFNIL) {
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luastate = detail::pick_main_thread < main_only && !r_main_only > (r.lua_state(), r.lua_state());
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ref = LUA_REFNIL;
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return;
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}
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if (r.ref == LUA_NOREF) {
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luastate = r.luastate;
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ref = LUA_NOREF;
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return;
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}
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if (detail::xmovable(lua_state(), r.lua_state())) {
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r.push(lua_state());
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ref = luaL_ref(lua_state(), LUA_REGISTRYINDEX);
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return;
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}
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luastate = detail::pick_main_thread < main_only && !r_main_only > (r.lua_state(), r.lua_state());
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ref = r.copy();
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}
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template <bool r_main_only>
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void move_assign(basic_reference<r_main_only>&& r) {
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if (valid()) {
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deref();
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}
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if (r.ref == LUA_REFNIL) {
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luastate = detail::pick_main_thread < main_only && !r_main_only > (r.lua_state(), r.lua_state());
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ref = LUA_REFNIL;
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return;
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}
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if (r.ref == LUA_NOREF) {
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luastate = r.luastate;
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ref = LUA_NOREF;
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return;
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}
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if (detail::xmovable(lua_state(), r.lua_state())) {
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r.push(lua_state());
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ref = luaL_ref(lua_state(), LUA_REGISTRYINDEX);
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return;
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}
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luastate = detail::pick_main_thread < main_only && !r_main_only > (r.lua_state(), r.lua_state());
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ref = r.ref;
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r.ref = LUA_NOREF;
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r.luastate = nullptr;
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}
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protected:
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basic_reference(lua_State* L, detail::global_tag) noexcept
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: basic_reference(detail::pick_main_thread<main_only>(L, L), detail::global_, detail::global_) {
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}
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basic_reference(lua_State* L, detail::global_tag, detail::global_tag) noexcept
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: stateless_reference(L, detail::global_), luastate(L) {
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}
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basic_reference(lua_State* oL, const basic_reference<!main_only>& o) noexcept : stateless_reference(oL, o), luastate(oL) {
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}
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void deref() const noexcept {
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return stateless_reference::deref(lua_state());
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}
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int copy() const noexcept {
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return copy(lua_state());
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}
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int copy(lua_State* L) const noexcept {
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return stateless_reference::copy(L);
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}
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public:
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basic_reference() noexcept = default;
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basic_reference(lua_nil_t) noexcept
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: basic_reference() {
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}
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basic_reference(const stack_reference& r) noexcept
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: basic_reference(r.lua_state(), r.stack_index()) {
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}
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basic_reference(stack_reference&& r) noexcept
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: basic_reference(r.lua_state(), r.stack_index()) {
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}
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template <bool r_main_only>
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basic_reference(lua_State* L, const basic_reference<r_main_only>& r) noexcept
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: luastate(detail::pick_main_thread<main_only>(L, L)) {
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if (r.ref == LUA_REFNIL) {
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ref = LUA_REFNIL;
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return;
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}
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if (r.ref == LUA_NOREF || lua_state() == nullptr) {
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ref = LUA_NOREF;
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return;
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}
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if (detail::xmovable(lua_state(), r.lua_state())) {
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r.push(lua_state());
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ref = luaL_ref(lua_state(), LUA_REGISTRYINDEX);
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return;
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}
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ref = r.copy();
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}
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template <bool r_main_only>
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basic_reference(lua_State* L, basic_reference<r_main_only>&& r) noexcept
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: luastate(detail::pick_main_thread<main_only>(L, L)) {
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if (r.ref == LUA_REFNIL) {
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ref = LUA_REFNIL;
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return;
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}
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if (r.ref == LUA_NOREF || lua_state() == nullptr) {
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ref = LUA_NOREF;
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return;
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}
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if (detail::xmovable(lua_state(), r.lua_state())) {
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r.push(lua_state());
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ref = luaL_ref(lua_state(), LUA_REGISTRYINDEX);
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return;
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}
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ref = r.ref;
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r.ref = LUA_NOREF;
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r.luastate = nullptr;
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}
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basic_reference(lua_State* L, const stack_reference& r) noexcept
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: luastate(detail::pick_main_thread<main_only>(L, L)) {
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if (lua_state() == nullptr || r.lua_state() == nullptr || r.get_type() == type::none) {
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ref = LUA_NOREF;
|
|
return;
|
|
}
|
|
if (r.get_type() == type::lua_nil) {
|
|
ref = LUA_REFNIL;
|
|
return;
|
|
}
|
|
if (lua_state() != r.lua_state() && !detail::xmovable(lua_state(), r.lua_state())) {
|
|
return;
|
|
}
|
|
r.push(lua_state());
|
|
ref = luaL_ref(lua_state(), LUA_REGISTRYINDEX);
|
|
}
|
|
basic_reference(lua_State* L, int index = -1) noexcept
|
|
: luastate(detail::pick_main_thread<main_only>(L, L)) {
|
|
// use L to stick with that state's execution stack
|
|
#if SOL_IS_ON(SOL_SAFE_STACK_CHECK_I_)
|
|
luaL_checkstack(L, 1, "not enough Lua stack space to push this reference value");
|
|
#endif // make sure stack doesn't overflow
|
|
lua_pushvalue(L, index);
|
|
ref = luaL_ref(L, LUA_REGISTRYINDEX);
|
|
}
|
|
basic_reference(lua_State* L, ref_index index) noexcept
|
|
: luastate(detail::pick_main_thread<main_only>(L, L)) {
|
|
lua_rawgeti(lua_state(), LUA_REGISTRYINDEX, index.index);
|
|
ref = luaL_ref(lua_state(), LUA_REGISTRYINDEX);
|
|
}
|
|
basic_reference(lua_State* L, lua_nil_t) noexcept
|
|
: luastate(detail::pick_main_thread<main_only>(L, L)) {
|
|
}
|
|
|
|
~basic_reference() noexcept {
|
|
if (lua_state() == nullptr || ref == LUA_NOREF)
|
|
return;
|
|
deref();
|
|
}
|
|
|
|
basic_reference(const basic_reference& o) noexcept
|
|
: stateless_reference(o.copy()), luastate(o.lua_state()) {
|
|
}
|
|
|
|
basic_reference(basic_reference&& o) noexcept
|
|
: stateless_reference(std::move(o)), luastate(o.lua_state()) {
|
|
o.luastate = nullptr;
|
|
}
|
|
|
|
basic_reference(const basic_reference<!main_only>& o) noexcept
|
|
: basic_reference(detail::pick_main_thread<main_only>(o.lua_state(), o.lua_state()), o) {
|
|
}
|
|
|
|
basic_reference(basic_reference<!main_only>&& o) noexcept
|
|
: stateless_reference(std::move(o)), luastate(detail::pick_main_thread<main_only>(o.lua_state(), o.lua_state())) {
|
|
o.luastate = nullptr;
|
|
o.ref = LUA_NOREF;
|
|
}
|
|
|
|
basic_reference& operator=(basic_reference&& r) noexcept {
|
|
move_assign(std::move(r));
|
|
return *this;
|
|
}
|
|
|
|
basic_reference& operator=(const basic_reference& r) noexcept {
|
|
copy_assign(r);
|
|
return *this;
|
|
}
|
|
|
|
basic_reference& operator=(basic_reference<!main_only>&& r) noexcept {
|
|
move_assign(std::move(r));
|
|
return *this;
|
|
}
|
|
|
|
basic_reference& operator=(const basic_reference<!main_only>& r) noexcept {
|
|
copy_assign(r);
|
|
return *this;
|
|
}
|
|
|
|
basic_reference& operator=(const lua_nil_t&) noexcept {
|
|
if (valid()) {
|
|
deref();
|
|
}
|
|
luastate = nullptr;
|
|
ref = LUA_NOREF;
|
|
return *this;
|
|
}
|
|
|
|
template <typename Super>
|
|
basic_reference& operator=(proxy_base<Super>&& r);
|
|
|
|
template <typename Super>
|
|
basic_reference& operator=(const proxy_base<Super>& r);
|
|
|
|
int push() const noexcept {
|
|
return push(lua_state());
|
|
}
|
|
|
|
int push(lua_State* L) const noexcept {
|
|
#if SOL_IS_ON(SOL_SAFE_STACK_CHECK_I_)
|
|
luaL_checkstack(L, 1, "not enough Lua stack space to push this reference value");
|
|
#endif // make sure stack doesn't overflow
|
|
if (lua_state() == nullptr) {
|
|
lua_pushnil(L);
|
|
return 1;
|
|
}
|
|
lua_rawgeti(lua_state(), LUA_REGISTRYINDEX, ref);
|
|
if (L != lua_state()) {
|
|
lua_xmove(lua_state(), L, 1);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void pop() const noexcept {
|
|
pop(lua_state());
|
|
}
|
|
|
|
void pop(lua_State* L, int n = 1) const noexcept {
|
|
stateless_reference::pop(L, n);
|
|
}
|
|
|
|
int registry_index() const noexcept {
|
|
return stateless_reference::registry_index();
|
|
}
|
|
|
|
bool valid() const noexcept {
|
|
return stateless_reference::valid(lua_state());
|
|
}
|
|
|
|
const void* pointer() const noexcept {
|
|
return stateless_reference::pointer(lua_state());
|
|
}
|
|
|
|
explicit operator bool() const noexcept {
|
|
return valid();
|
|
}
|
|
|
|
type get_type() const noexcept {
|
|
return stateless_reference::get_type(lua_state());
|
|
}
|
|
|
|
lua_State* lua_state() const noexcept {
|
|
return luastate;
|
|
}
|
|
};
|
|
|
|
template <bool lb, bool rb>
|
|
inline bool operator==(const basic_reference<lb>& l, const basic_reference<rb>& r) {
|
|
auto ppl = stack::push_pop(l);
|
|
auto ppr = stack::push_pop(r);
|
|
return lua_compare(l.lua_state(), -1, -2, LUA_OPEQ) == 1;
|
|
}
|
|
|
|
template <bool lb, bool rb>
|
|
inline bool operator!=(const basic_reference<lb>& l, const basic_reference<rb>& r) {
|
|
return !operator==(l, r);
|
|
}
|
|
|
|
template <bool lb>
|
|
inline bool operator==(const basic_reference<lb>& l, const stack_reference& r) {
|
|
auto ppl = stack::push_pop(l);
|
|
return lua_compare(l.lua_state(), -1, r.stack_index(), LUA_OPEQ) == 1;
|
|
}
|
|
|
|
template <bool lb>
|
|
inline bool operator!=(const basic_reference<lb>& l, const stack_reference& r) {
|
|
return !operator==(l, r);
|
|
}
|
|
|
|
template <bool rb>
|
|
inline bool operator==(const stack_reference& l, const basic_reference<rb>& r) {
|
|
auto ppr = stack::push_pop(r);
|
|
return lua_compare(l.lua_state(), -1, r.stack_index(), LUA_OPEQ) == 1;
|
|
}
|
|
|
|
template <bool rb>
|
|
inline bool operator!=(const stack_reference& l, const basic_reference<rb>& r) {
|
|
return !operator==(l, r);
|
|
}
|
|
|
|
template <bool lb>
|
|
inline bool operator==(const basic_reference<lb>& lhs, const lua_nil_t&) {
|
|
return !lhs.valid();
|
|
}
|
|
|
|
template <bool rb>
|
|
inline bool operator==(const lua_nil_t&, const basic_reference<rb>& rhs) {
|
|
return !rhs.valid();
|
|
}
|
|
|
|
template <bool lb>
|
|
inline bool operator!=(const basic_reference<lb>& lhs, const lua_nil_t&) {
|
|
return lhs.valid();
|
|
}
|
|
|
|
template <bool rb>
|
|
inline bool operator!=(const lua_nil_t&, const basic_reference<rb>& rhs) {
|
|
return rhs.valid();
|
|
}
|
|
|
|
struct reference_equals : public stack_reference_equals {
|
|
template <bool rb>
|
|
bool operator()(const lua_nil_t& lhs, const basic_reference<rb>& rhs) const {
|
|
return lhs == rhs;
|
|
}
|
|
|
|
template <bool lb>
|
|
bool operator()(const basic_reference<lb>& lhs, const lua_nil_t& rhs) const {
|
|
return lhs == rhs;
|
|
}
|
|
|
|
template <bool lb, bool rb>
|
|
bool operator()(const basic_reference<lb>& lhs, const basic_reference<rb>& rhs) const {
|
|
return lhs == rhs;
|
|
}
|
|
|
|
template <bool lb>
|
|
bool operator()(const basic_reference<lb>& lhs, const stack_reference& rhs) const {
|
|
return lhs == rhs;
|
|
}
|
|
|
|
template <bool rb>
|
|
bool operator()(const stack_reference& lhs, const basic_reference<rb>& rhs) const {
|
|
return lhs == rhs;
|
|
}
|
|
};
|
|
|
|
struct reference_hash : public stack_reference_hash {
|
|
typedef reference argument_type;
|
|
typedef std::size_t result_type;
|
|
|
|
template <bool lb>
|
|
result_type operator()(const basic_reference<lb>& lhs) const {
|
|
std::hash<const void*> h;
|
|
return h(lhs.pointer());
|
|
}
|
|
};
|
|
} // namespace sol
|
|
|
|
#endif // SOL_REFERENCE_HPP
|