pass by ref, no matching overload found

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I want to pass parameters in method by reference.

class Node : public EventReceiver
{
public:
virtual void setTag ( const std::string& name, const std::string& value )
...
};

And this is luabind code to expose Node to lua:
class_<Node, EventReceiver> ( "Node" )
.def ( constructor<> () )
.def ( "setTag", &Node::setTag )
...

I want to set tag for node from lua script:
node = scene:find ( "NewGameButton" )
node:setTag ( "scale", value )

I get luabind error:
No matching overload found, candidates:
void setTag(Node&,std::string const&,std::string const&)

But this line works fine
node:setTag ( "scale", "str_value" )

How to get setTag working in both cases?

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<div dir=3D"ltr"><div>I want to pass parameters in method by reference.</di=
v><div><br></div><div>class Node : public EventReceiver</div><div>{</div><d=
iv>public:</div><div><span class=3D"" style=3D"white-space:pre">	</span>vir=
tual void setTag ( const std::string&amp; name, const std::string&amp; valu=
e )</div><div><span class=3D"" style=3D"white-space:pre">	</span>...</div><=
div>};</div><div><br></div><div>And this is luabind code to expose Node to =
lua:</div><div><span class=3D"" style=3D"white-space:pre">	</span>class_&lt=
;Node, EventReceiver&gt; ( &quot;Node&quot; )</div><div><span class=3D"" st=
yle=3D"white-space:pre">		</span>.def ( constructor&lt;&gt; () )</div><div>=
<span class=3D"" style=3D"white-space:pre">		</span>.def ( &quot;setTag&quo=
t;, &amp;Node::setTag )</div><div><span class=3D"" style=3D"white-space:pre=
">		</span>...</div><div><br></div><div>I want to set tag for node from lua=
 script:</div><div>node =3D scene:find ( &quot;NewGameButton&quot; )</div><=
div>node:setTag ( &quot;scale&quot;, value )</div><div><br></div><div>I get=
 luabind error:</div><div>No matching overload found, candidates:</div><div=
>void setTag(Node&amp;,std::string const&amp;,std::string const&amp;)</div>=
<div><br></div><div>But this line works fine</div><div>node:setTag ( &quot;=
scale&quot;, &quot;str_value&quot; )</div><div><br></div><div>How to get se=
tTag working in both cases?</div></div>

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