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boost::bind() returns something that can be called like a function. It doesn't actually call the function.
In your first example, you should be able to reproduce the behavior with:
boost::bind(&show, boost::ref(letter))();
Or if you want it to call that function more than once (like the TF example does), you could do:
boost::function f = boost::bind(&show, boost::ref(letter));
f();
f();
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