boost::urls::url_view_base::zone_id

Return the IPv6 Zone ID

Synopsis

Declared in <boost/url/url_view_base.hpp>

template<string_token::StringToken StringToken = string_token::return_string>
StringToken::result_type
zone_id(StringToken&& token = {});

Description

If the host type is host_type::ipv6, this function returns the Zone ID as a string. Otherwise an empty string is returned. Any percent‐escapes in the string are decoded first.

Example

assert( url_view( "http://[fe80::1%25eth0]/" ).zone_id() == "eth0" );

Complexity

Linear in this‐>encoded_zone_id().size().

Exception Safety

Calls to allocate may throw.

BNF

host        = IP-literal / IPv4address / reg-name

IP-literal = "[" ( IPv6address / IPv6addrz / IPvFuture  ) "]"

ZoneID = 1*( unreserved / pct-encoded )

IPv6addrz = IPv6address "%25" ZoneID

Specification

https://datatracker.ietf.org/doc/html/rfc6874

Return Value

The Zone ID as a string.

Parameters

Name

Description

token

A string token customization.

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