[#boost-urls-params_encoded_base-const_iterator]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_encoded_base.adoc[params&lowbar;encoded&lowbar;base]::const&lowbar;iterator
:relfileprefix: ../../../
:mrdocs:

A Bidirectional iterator to a query parameter

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_encoded_base.hpp#L80[boost&sol;url&sol;params&lowbar;encoded&lowbar;base&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
using const&lowbar;iterator = xref:boost/urls/params_encoded_base/iterator.adoc[iterator];
----

== Description

Objects of this type allow iteration through the parameters in the query&period; Strings returned by iterators may contain percent escapes&period; The values returned are read&hyphen;only&semi; changes to parameters must be made through the container instead, if the container supports modification&period;

The strings produced when iterators are dereferenced refer to the underlying character buffer&period; Ownership is not transferred&semi; the caller is responsible for ensuring that the lifetime of the buffer extends until it is no longer referenced by any container or iterator&period;


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