[#45C6C2580A4449ACB38567265B3298EEC2D15B72]

<div id="45C6C2580A4449ACB38567265B3298EEC2D15B72">
    <div>
        <h2>Function <a href="#">url</a>::
set_host_address</h2>
        <p><span>Set the host to an address</span></p>


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    <div>
        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            url&
set_host_address(core::string_view s);
        </pre>
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    <div>
        <h3>Description</h3>
        <p><span>Depending on the contents of the passed</span> <span>string, this function sets the host:</span></p>

<li><span>If the string is a valid IPv4 address,</span>
<span>then the host is set to the address.</span>
<span>The host type is</span>
<span>host_type::ipv4</span>
<span>.</span></li>
<li><span>If the string is a valid IPv6 address,</span>
<span>then the host is set to that address.</span>
<span>The host type is</span>
<span>host_type::ipv6</span>
<span>.</span></li>
<li><span>If the string is a valid IPvFuture,</span>
<span>then the host is set to that address.</span>
<span>The host type is</span>
<span>host_type::ipvfuture</span>
<span>.</span></li>
<li><span>Otherwise, the host name is set to</span>
<span>the string, which may be empty.</span>
<span>Reserved characters in the string are</span>
<span>percent-escaped in the result.</span>
<span>The host type is</span>
<span>host_type::name</span>
<span>.</span></li>
<p><span>In all cases, when this function returns,</span>
<span>the URL contains an authority.</span></p>

<h3>Example</h3>
<code>
assert( url( "http://www.example.com" ).set_host_address( "127.0.0.1" ).buffer() == "http://127.0.0.1" );
</code>
<h3>Postconditions</h3>
<code>
this->has_authority() == true
</code>
<h3>Complexity</h3>
<p><span>Linear in `s.size()`.</span></p>

<h3>Exception Safety</h3>
<p><span>Strong guarantee.</span>
<span>Calls to allocate may throw.</span></p>

<h3>BNF</h3>
<code>
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

IPv6address =                            6( h16 ":" ) ls32
            /                       "::" 5( h16 ":" ) ls32
            / [               h16 ] "::" 4( h16 ":" ) ls32
            / [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32
            / [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32
            / [ *3( h16 ":" ) h16 ] "::"    h16 ":"   ls32
            / [ *4( h16 ":" ) h16 ] "::"              ls32
            / [ *5( h16 ":" ) h16 ] "::"              h16
            / [ *6( h16 ":" ) h16 ] "::"

ls32        = ( h16 ":" h16 ) / IPv4address
            ; least-significant 32 bits of address

h16         = 1*4HEXDIG
            ; 16 bits of address represented in hexadecimal

IPvFuture     = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )

reg-name    = *( unreserved / pct-encoded / "-" / ".")
</code>
<h3>Specification</h3>
<li><a href="https://en.wikipedia.org/wiki/IPv4">IPv4 (Wikipedia)</a></li>
<li><a href="https://datatracker.ietf.org/doc/html/rfc4291">IP Version 6 Addressing Architecture (rfc4291)</a></li>
<li><a href="https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2">            3.2.2. Host (rfc3986)</a></li>

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