erations with dimensioned quantities. Specifically, construction of quantities
        is required to fully specify both value and unit. Direct construction from
        a scalar value is prohibited (though the static member function <span class="underline"><code class="computeroutput"><a class="link" href="../boost/units/quantity.html#id-1_3_44_10_2_36_1_1_1_18_1-bb">from_value</a></code></span>
        is provided to enable this functionality where it is necessary. In addition,
        a <span class="unde