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

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


Return true if s0 is less than s1 using case-insensitive comparison


=== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/ci_string.hpp#L252[boost/url/grammar/ci_string.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
bool
ci_is_less(
    core::string_view s0,
    core::string_view s1) noexcept;
----

=== Description


The comparison algorithm implements a
case-insensitive total order on the set
of all strings; however, it is not a
lexicographical comparison.
The function is defined only for strings
containing low-ASCII characters.
[,cpp]
----
assert( ! ci_is_less( "Boost", "boost" ) );
----








=== See Also


xref:boost/urls/grammar/ci_compare.adoc[ci_compare]
,
xref:boost/urls/grammar/ci_is_equal-0a.adoc[ci_is_equal]
.