[#7959759509D8F8470BBB3DED31B97D5FC0389D01]

<div id="7959759509D8F8470BBB3DED31B97D5FC0389D01">
    <div>
        <h2>Friend operator-</h2>
        <p><span>Return a new character set by subtracting</span></p>


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    <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>
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    <div>
        <h3>Description</h3>
        <p><span>This function returns a new character</span> <span>set which is formed from all of the</span>
<span>characters in `cs0` which are not in `cs`.</span></p>

<h3>Example</h3>
<p><span>This statement declares a character set</span>
<span>containing all the lowercase letters</span>
<span>which are not vowels:</span></p>

<code>
constexpr lut_chars consonants = lut_chars("abcdefghijklmnopqrstuvwxyz") - "aeiou";
</code>
<h3>Complexity</h3>
<p><span>Constant.</span></p>


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