[#24EE323827C6D6D6BB4690F93A8E4D4EB97563DD]

<div id="24EE323827C6D6D6BB4690F93A8E4D4EB97563DD">
    <div>
        <h2>Friend operator+</h2>
        <p><span>Return the union of two character sets.</span></p>


    </div>

    <div>
        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            friend
constexpr
lut_chars
operator+(
    lut_chars const& cs0,
    lut_chars const& cs1) noexcept;
        </pre>
    </div>

    <div>
        <h3>Description</h3>
        <p><span>This function returns a new character</span> <span>set which contains all of the characters</span>
<span>in `cs0` as well as all of the characters</span>
<span>in `cs`.</span></p>

<h3>Example</h3>
<p><span>This creates a character set which</span>
<span>includes all letters and numbers</span></p>

<code>
constexpr lut_chars alpha_chars(
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "abcdefghijklmnopqrstuvwxyz");

constexpr lut_chars alnum_chars = alpha_chars + "0123456789";
</code>
<h3>Complexity</h3>
<p><span>Constant.</span></p>


    </div>
</div>