>
      The action undertaken by each error condition is determined by the current
      <a class="link" href="../policy.html" title="Chapter&#160;18.&#160;Policies: Controlling Precision, Error Handling etc">Policy</a> in effect. This can be changed program-wide
      by setting some configuration macros, or at namespace scope, or at the call
      site (by specifying a specific policy in the function call).
    </p>
<p>
      The available actions are:
    </p>
<div class="variablelist">
<p class="title">