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assume_value_lvalue_const.html

assume_value_lvalue_const.html 2.5 KB
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  3. <title>const value_type &amp;assume_value() const &amp; noexcept - Boost.Outcome documentation</title>
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  13.   <div class="titlepage"><div><div><h1 style="clear: both"><code>const value_type &amp;assume_value() const &amp; noexcept</code></h1></div></div></div>
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  14.   <p>Narrow contract const lvalue reference observer of any value present. <code>NoValuePolicy::narrow_value_check()</code> is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however <code>NoValuePolicy::narrow_value_check()</code> can do something to avoid that.</p>
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  16. <p>Note that if <code>value_type</code> is <code>void</code>, only a <code>const</code> overload returning <code>void</code> is present.</p>
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  18. <p><em>Requires</em>: Always available.</p>
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  20. <p><em>Complexity</em>: Depends on <code>NoValuePolicy::narrow_value_check()</code>.</p>
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  22. <p><em>Guarantees</em>: An exception is never thrown.</p>
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  25.         </div><p><small>Last revised: February 12, 2019 at 16:36:24 UTC</small></p>
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