:relfileprefix: ../../../../
[#boost-urls-grammar-lut_chars-operator_call-0f6]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/grammar.adoc[pass:[grammar]]::xref:boost/urls/grammar/lut_chars.adoc[pass:[lut_chars]]::operator()


Return true if ch is in the character set.


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/lut_chars.hpp#L265[boost/url/grammar/lut_chars.hpp,window=blank_]>`

[source,cpp,subs="verbatim,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.

=== Complexity

Constant.

=== Exception Safety

Throws nothing.





== Parameters

|===
| Name | Description 

| *ch*
| 
The character to test.

|===