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Diffstat (limited to '3rdparty/sol2/sol/reference.hpp')
-rw-r--r-- | 3rdparty/sol2/sol/reference.hpp | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/3rdparty/sol2/sol/reference.hpp b/3rdparty/sol2/sol/reference.hpp new file mode 100644 index 00000000000..c7c9d823d59 --- /dev/null +++ b/3rdparty/sol2/sol/reference.hpp @@ -0,0 +1,174 @@ +// 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 |