title: Convert const char* to const wchar_t*
body: <p>I am trying to create a program with Irrlicht that loads certain things from a configuration file written in Lua, one of which is the window title. However, the <code>lua_tostring</code> function returns a <code>const char*</code> while the Irrlicht device's method <code>setWindowCaption</code> expects a <code>const wchar_t*</code>. How can I convert the string returned by <code>lua_tostring</code>?</p>