[#C09F005DE770948FAB82A2FA8F293C22C43C9733]

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        <h2>Function to_upper</h2>
        <p><span>Return c converted to uppercase</span></p>


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        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            constexpr
char
to_upper(char c) noexcept;
        </pre>
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        <h3>Description</h3>
        <p><span>This function returns the character,</span> <span>converting it to uppercase if it is</span>
<span>lowercase.</span>
<span>The function is defined only for</span>
<span>low-ASCII characters.</span></p>

<h3>Example</h3>
<code>
assert( to_upper( 'a' ) == 'A' );
</code>
<h3>Exception Safety</h3>
<p><span>Throws nothing.</span></p>


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