:relfileprefix: ../../../
[#EFD205C2FD02E34A0FAE1B9CA2ED6E03A0C2D512]

= Class lut_chars

pass:v,q[A set of characters]


== Synopsis

Declared in header `</boost/url/grammar/lut_chars.hpp#L64[boost/url/grammar/lut_chars.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
class lut_chars;
----

==  Member Functions
[,cols=2]
|===
|Name |Description
|xref:boost/urls/grammar/lut_chars/find_if.adoc[`pass:v[find_if]`] |

|xref:boost/urls/grammar/lut_chars/find_if_not.adoc[`pass:v[find_if_not]`] |

|xref:boost/urls/grammar/lut_chars/2constructor.adoc[`pass:v[lut_chars]`] |
pass:v,q[Constructor]

|xref:boost/urls/grammar/lut_chars/operator_call.adoc[`pass:v[operator()]`] |
pass:v,q[Return true if ch is in the character set.]

|xref:boost/urls/grammar/lut_chars/operator_bitnot.adoc[`pass:v[operator~]`] |
pass:v,q[Return a new character set which is the complement of another character set.]

|===
==  Friends
[,cols=2]
|===
|Name |Description
|xref:boost/urls/grammar/lut_chars/8friend-02.adoc[`pass:v[operator+]`] |
pass:v,q[Return the union of two character sets.]

|xref:boost/urls/grammar/lut_chars/8friend-07.adoc[`pass:v[operator-]`] |
pass:v,q[Return a new character set by subtracting]

|===

== Description

pass:v,q[The characters defined by instances of] pass:v,q[this set are provided upon construction.]
pass:v,q[The `constexpr` implementation allows]
pass:v,q[these to become compile-time constants.]

=== Example
pass:v,q[Character sets are used with rules and the]
pass:v,q[functions]
xref:boost/urls/grammar/lut_chars/find_if.adoc[find_if]
pass:v,q[and]
xref:boost/urls/grammar/lut_chars/find_if_not.adoc[find_if_not.]
[,cpp]
----
constexpr lut_chars vowel_chars = "AEIOU" "aeiou";

system::result< core::string_view > rv = parse( "Aiea", token_rule( vowel_chars ) );
----