[#boost-urls-grammar-lut_chars-operator_call]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/grammar.adoc[grammar]::xref:boost/urls/grammar/lut_chars.adoc[lut_chars]::operator()
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:mrdocs:


Return true if ch is in the character set.

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/lut_chars.hpp#L256[boost/url/grammar/lut_chars.hpp]>`

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

[.small]#xref:boost/urls/grammar/lut_chars/operator_call-0fe.adoc[_» more..._]#

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

[.small]#xref:boost/urls/grammar/lut_chars/operator_call-0f6.adoc[_» more..._]#

== 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.


|===



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