[#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

[cols="1,4"]
|===
| Name| Description
| *c*
| The character to convert
|===

== See Also

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


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