[#boost-urls-url_view_base-is_path_absolute]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_view_base.adoc[url_view_base]::is_path_absolute
:relfileprefix: ../../../
:mrdocs:

Return true if the path is absolute

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/url_view_base.hpp#L1674[boost/url/url_view_base.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
is_path_absolute() const noexcept;
----

== Description

This function returns true if the path begins with a forward slash ('/').

== Example
[,cpp]
----
assert( url_view( "/path/to/file.txt" ).is_path_absolute() );
----
== Complexity
Constant.

== Exception Safety
Throws nothing.

== 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[]

== Return Value

`true` if the path is absolute, `false` otherwise&period;

== See Also

xref:boost/urls/url_view_base/encoded_path.adoc[`encoded&lowbar;path`], xref:boost/urls/url_view_base/encoded_segments.adoc[`encoded&lowbar;segments`]&period; xref:boost/urls/url_view_base/path.adoc[`path`], xref:boost/urls/url_view_base/segments.adoc[`segments`]&period;


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