:relfileprefix: ../../../ [#boost-urls-param-2constructor-0d] == xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/param.adoc[pass:[param]]::param Constructor === Synopsis Declared in header `` [source,cpp,subs="verbatim,macros,-callouts"] ---- constexpr param(xref:boost/urls/param.adoc[param] const& other) = default; ---- === Description Upon construction, this becomes a copy of `other`. [,cpp] ---- this->key == other.key && this->value == other.value && this->has_value == other.has_value ---- === Linear in `other.key.size() + other.value.size()`. === Calls to allocate may throw.