mirror of https://github.com/minetest/minetest.git
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
/*
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Minetest
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Copyright (C) 2018 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#pragma once
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#include <string_view>
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extern "C" {
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#include <lua.h>
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}
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class LuaHelper
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{
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protected:
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/**
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* Read a value using a template type T from Lua state L at index
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*
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* @tparam T type to read from Lua
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* @param L Lua state
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* @param index Lua index to read
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* @return read value from Lua
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*/
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template <typename T>
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static T readParam(lua_State *L, int index);
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/**
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* Read a value using a template type T from Lua state L at index
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*
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* @tparam T type to read from Lua
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* @param L Lua state
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* @param index Lua index to read
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* @param default_value default value to apply if nil
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* @return read value from Lua or default value if nil
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*/
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template <typename T>
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static inline T readParam(lua_State *L, int index, const T &default_value)
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{
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return lua_isnoneornil(L, index) ? default_value : readParam<T>(L, index);
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}
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};
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// (only declared for documentation purposes:)
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/**
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* Read a string from Lua state L at index without copying it.
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*
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* Note that the returned string view is only valid as long as the value is on
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* the stack and has not been modified. Be careful.
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*
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* @param L Lua state
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* @param index Lua index to read
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* @return string view
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*/
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template <>
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std::string_view LuaHelper::readParam(lua_State *L, int index);
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