[#boost-urls-grammar-lut_chars-operator_call-0f6]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/grammar.adoc[grammar]::xref:boost/urls/grammar/lut_chars.adoc[lut&lowbar;chars]::operator()
:relfileprefix: ../../../../
:mrdocs:


Return true if ch is in the character set&period;

== Synopsis


Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/lut_chars.hpp#L265[boost&sol;url&sol;grammar&sol;lut&lowbar;chars&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
bool
operator()(char ch) const noexcept;
----

== Description


This function returns true if the        character `ch` is in the set, otherwise        it returns false&period;


=== Complexity

Constant&period;


=== Exception Safety

Throws nothing&period;



== Parameters


|===
| Name | Description

| *ch*
| The character to test&period;


|===



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