[#boost-urls-grammar-to_lower]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/grammar.adoc[grammar]::to&lowbar;lower
:relfileprefix: ../../../
:mrdocs:


Return c converted to lowercase

== Synopsis


Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/ci_string.hpp#L53[boost&sol;url&sol;grammar&sol;ci&lowbar;string&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
char
to&lowbar;lower(char c) noexcept;
----

== Description


This function returns the character,    converting it to lowercase if it is    uppercase&period;    The function is defined only for    low&hyphen;ASCII characters&period;


=== Example

[,cpp]
----
assert( to_lower( 'A' ) == 'a' );
----

=== Exception Safety

Throws nothing&period;



== Return Value


The converted character



== Parameters


|===
| Name | Description

| *c*
| The character to convert


|===

== See Also


xref:boost/urls/grammar/to_upper.adoc[to&lowbar;upper]&period;






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