1 files changed, 69 insertions, 0 deletions
diff --git a/lib/sol2/include/sol/stack_guard.hpp b/lib/sol2/include/sol/stack_guard.hpp
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+++ b/lib/sol2/include/sol/stack_guard.hpp
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+// sol3 
+
+// The MIT License (MIT)
+
+// Copyright (c) 2013-2019 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_STACK_GUARD_HPP
+#define SOL_STACK_GUARD_HPP
+
+#include "compatibility/version.hpp"
+#include "error.hpp"
+#include <functional>
+
+namespace sol {
+	namespace detail {
+		inline void stack_fail(int, int) {
+#if !(defined(SOL_NO_EXCEPTIONS) && SOL_NO_EXCEPTIONS)
+			throw error(detail::direct_error, "imbalanced stack after operation finish");
+#else
+			// Lol, what do you want, an error printout? :3c
+			// There's no sane default here. The right way would be C-style abort(), and that's not acceptable, so
+			// hopefully someone will register their own stack_fail thing for the `fx` parameter of stack_guard.
+#endif // No Exceptions
+		}
+	} // namespace detail
+
+	struct stack_guard {
+		lua_State* L;
+		int top;
+		std::function<void(int, int)> on_mismatch;
+
+		stack_guard(lua_State* L)
+		: stack_guard(L, lua_gettop(L)) {
+		}
+		stack_guard(lua_State* L, int top, std::function<void(int, int)> fx = detail::stack_fail)
+		: L(L), top(top), on_mismatch(std::move(fx)) {
+		}
+		bool check_stack(int modification = 0) const {
+			int bottom = lua_gettop(L) + modification;
+			if (top == bottom) {
+				return true;
+			}
+			on_mismatch(top, bottom);
+			return false;
+		}
+		~stack_guard() {
+			check_stack();
+		}
+	};
+} // namespace sol
+
+#endif // SOL_STACK_GUARD_HPP