:relfileprefix: ../../../ [#boost-urls-static_url-set_host_ipv4] == xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/static_url.adoc[pass:[static_url]]::set_host_ipv4 Set the host to an address === Synopsis Declared in header `` [source,cpp,subs="verbatim,macros,-callouts"] ---- xref:boost/urls/static_url.adoc[static_url]& set_host_ipv4(xref:boost/urls/ipv4_address.adoc[ipv4_address] const& addr); ---- === Description The host is set to the specified IPv4 address. The host type is xref:boost/urls/host_type/ipv4.adoc[host_type::ipv4] . [,cpp] ---- assert( url("http://www.example.com").set_host_ipv4( ipv4_address( "127.0.0.1" ) ).buffer() == "http://127.0.0.1" ); ---- === Linear in `this->size()`. [,cpp] ---- this->has_authority() == true && this->host_ipv4_address() == addr && this->host_type() == host_type::ipv4 ---- === Strong guarantee. Calls to allocate may throw. [,cpp] ---- IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet dec-octet = DIGIT ; 0-9 / %x31-39 DIGIT ; 10-99 / "1" 2DIGIT ; 100-199 / "2" %x30-34 DIGIT ; 200-249 / "25" %x30-35 ; 250-255 ---- * link:https://en.wikipedia.org/wiki/IPv4[IPv4 (Wikipedia)] * link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[ 3.2.2. Host (rfc3986)] === Parameters |=== | Name | Description | *addr* | The address to set. |=== === See Also xref:boost/urls/url_base/set_encoded_host.adoc[set_encoded_host] , xref:boost/urls/url_base/set_encoded_host_address.adoc[set_encoded_host_address] , xref:boost/urls/url_base/set_encoded_host_name.adoc[set_encoded_host_name] , xref:boost/urls/url_base/set_host.adoc[set_host] , xref:boost/urls/url_base/set_host_address.adoc[set_host_address] , xref:boost/urls/url_base/set_host_ipv6.adoc[set_host_ipv6] , xref:boost/urls/url_base/set_host_ipvfuture.adoc[set_host_ipvfuture] , xref:boost/urls/url_base/set_host_name.adoc[set_host_name] .