call_function with parts of string + length

Consider this:

 

char *pString = "Hello world!";

luabind::call_function<void>(L, "foo", pString);

 

For efficiency, I want to send "Hello" only, to function foo - without having to copy the string or alter the pointer array. How can this be done? It must be possible to somehow wrap the pointer with a desired length!

 

Something like this:

luabind::call_function<void>(L, "foo", luabind::parameter(pString, 5));

 

Thanks.

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