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

== 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
  

[source,cpp,subs="verbatim,macros,-callouts"]
----
constexpr
bool
xref:boost/urls/grammar/lut_chars/operator_call-0fe.adoc[pass:[operator()]](unsigned char ch) const noexcept;
----

[source,cpp,subs="verbatim,macros,-callouts"]
----
constexpr
bool
xref:boost/urls/grammar/lut_chars/operator_call-0f6.adoc[pass:[operator()]](char ch) const noexcept;
----
  
=== Description


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

=== Constant.

=== Throws nothing.




=== Parameters

|===
| Name | Description 

| *ch*
| 
The character to test.

|===




