[#boost-urls-url_base-set_path_absolute]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_base.adoc[url&lowbar;base]::set&lowbar;path&lowbar;absolute
:relfileprefix: ../../../
:mrdocs:

Set if the path is absolute

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/url_base.hpp#L1761[boost&sol;url&sol;url&lowbar;base&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
set&lowbar;path&lowbar;absolute(bool absolute);
----

== Description

This function adjusts the path to make it absolute or not, depending on the parameter&period;

[NOTE]
====
If an authority is present, the path is always absolute&period; In this case, the function has no effect&period;

====

== Example

[,cpp]
----
url u( "path/to/file.txt" );
assert( u.set_path_absolute( true ) );
assert( u.buffer() == "/path/to/file.txt" );
----
== Postconditions

[,cpp]
----
this->is_path_absolute() == true && this->encoded_path().front() == '/'
----
== Complexity

Linear in `this&hyphen;&gt;size()`&period;

== BNF

[,cpp]
----
path          = path-abempty    ; begins with "/" or is empty
              / path-absolute   ; begins with "/" but not "//"
              / path-noscheme   ; begins with a non-colon segment
              / path-rootless   ; begins with a segment
              / path-empty      ; zero characters

path-abempty  = *( "/" segment )
path-absolute = "/" [ segment-nz *( "/" segment ) ]
path-noscheme = segment-nz-nc *( "/" segment )
path-rootless = segment-nz *( "/" segment )
path-empty    = 0<pchar>
----
== Specification

* https://datatracker.ietf.org/doc/html/rfc3986#section-3.3[3&period;3&period;  Path (rfc3986)]

== Return Value

true on success&period;

== Parameters

[cols=2]
|===
| Name
| Description
| *absolute*
| If `true`, the path is made absolute&period;
|===

== See Also

xref:boost/urls/url_base/encoded_segments-0a.adoc[`encoded&lowbar;segments`], xref:boost/urls/url_base/segments-07.adoc[`segments`], xref:boost/urls/url_base/set_encoded_path.adoc[`set&lowbar;encoded&lowbar;path`], xref:boost/urls/url_base/set_path.adoc[`set&lowbar;path`]&period;


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