tations. There is,
    however, no performance gain in the 'left' forms: they still need a
    conversion from <code>U</code> to <code>T</code> and have an
    implementation equivalent to the code that would be automatically created
    by the compiler if it considered the single type binary operator to be
    the best match.</p>

    <h3>Base Class <a name="chaining">Chaining</a> and Object Size</h3>

    <p>Every operator class template, except the <a href=
    "#ex_oprs">arithmetic examples</a> and the 