:relfileprefix: ../../../
[#boost-urls-grammar-to_lower]

== xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/grammar.adoc[pass:[grammar]]::to_lower


Return c converted to lowercase


=== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/ci_string.hpp#L53[boost/url/grammar/ci_string.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
constexpr
char
to_lower(char c) noexcept;
----

=== Description


This function returns the character,
converting it to lowercase if it is
uppercase.
The function is defined only for
low-ASCII characters.
[,cpp]
----
assert( to_lower( 'A' ) == 'a' );
----

=== Throws nothing.




=== Return Value


The converted character



=== Parameters

|===
| Name | Description 

| *c*
| 
The character to convert

|===




=== See Also


xref:boost/urls/grammar/to_upper.adoc[to_upper]
.