:relfileprefix: ../../../
[#boost-urls-params_base-begin]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/params_base.adoc[pass:[params_base]]::begin


Return an iterator to the beginning


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_base.hpp#L218[boost/url/params_base.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
begin() const noexcept;
----

== Description


=== Complexity

Linear in the size of the first param.

=== Exception Safety

Throws nothing.