:relfileprefix: ../../../ [#28BF05DCA631CB3A42D5EE9FAA8272DC1F081E1C] = Function url_view_base::host_ipv4_address pass:v,q[Return the host IPv4 address] == Synopsis Declared in header `` [source,cpp,subs="verbatim,macros,-callouts"] ---- xref:boost/urls/ipv4_address.adoc[ipv4_address] host_ipv4_address() const noexcept; ---- == Description pass:v,q[If the host type is] xref:boost/urls/host_type/ipv4.adoc[host_type::ipv4,] pass:v,q[this function returns the address as] pass:v,q[a value of type] xref:boost/urls/ipv4_address.adoc[ipv4_address.] pass:v,q[Otherwise, if the host type is not an IPv4] pass:v,q[address, it returns a default-constructed] pass:v,q[value which is equal to the unspecified] pass:v,q[address "0.0.0.0".] === Example [,cpp] ---- assert( url_view( "http://127.0.0.1/index.htm?user=win95" ).host_ipv4_address() == ipv4_address( "127.0.0.1" ) ); ---- === Complexity pass:v,q[Constant.] === Exception Safety pass:v,q[Throws nothing.] === BNF [,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 ---- === Specification * link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[3.2.2. Host (rfc3986)] == Return Value * `ipv4_address`