use nullptr

diff --git a/ext/luawrapper/include/LuaContext.hpp b/ext/luawrapper/include/LuaContext.hpp
index 49aed17bbf524b99feba9430361c5c6f4ea63007..e3a87ee9b77688fdaf2c9024cdcc3cb101280fad 100644 (file)
--- a/ext/luawrapper/include/LuaContext.hpp
+++ b/ext/luawrapper/include/LuaContext.hpp
@@ -2690,12 +2690,12 @@ struct LuaContext::Reader<std::string>
         size_t len;
         const auto val = lua_tolstring(state, -1, &len);
 
-        if (val != 0)
+        if (val != nullptr)
           result.assign(val, len);
 
         lua_pop(state, 1);
 
-        return val != 0 ? boost::optional<std::string>{ std::move(result) } : boost::none;
+        return val != nullptr ? boost::optional<std::string>{ std::move(result) } : boost::none;
     }
 };