d, though if one considers the entire process of
    invoking slots one sees that the overhead is nearly equivalent to
    that in the "push" model, but we have inverted the control
    structures to make iteration and dereference complex (instead of
    making combiner state-finding complex).</p>
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<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.3.37.9.6"></a>Connection Interfaces: +=  operator</h3></div></div></div>
<p> Boost.Signals2 supports a connection synt