[#boost-urls-grammar-ci_equal]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/grammar.adoc[grammar]::ci_equal
:relfileprefix: ../../../
:mrdocs:

A case‐insensitive equals predicate for strings

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/ci_string.hpp#L326[boost/url/grammar/ci_string.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
using ci_equal = /* implementation-defined */;
----

== Description

The function object returns `true` when two strings are equal, ignoring case. This is a suitable equality predicate for unordered containers. The function is defined only for strings containing low‐ASCII characters.

== Example
[,cpp]
----
boost::unordered_map< std::string, std::string, ci_hash, ci_equal > m1;

std::unordered_map  < std::string, std::string, ci_hash, ci_equal > m2; // (since C++20)
----
== See Also

xref:boost/urls/grammar/ci_hash.adoc[`ci&lowbar;hash`], xref:boost/urls/grammar/ci_less.adoc[`ci&lowbar;less`]&period;


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