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##### url::is_path_absolute

Return true if the path is absolute.

###### Synopsis

    bool
    is_path_absolute() const;

###### Description

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

###### Example

    assert( url_view( "/path/to/file.txt" ).is_path_absolute() );

###### Complexity

Constant.

###### Exception Safety

Throws nothing.

###### BNF

    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

- 3.3. Path (rfc3986)

###### See Also

`encoded_path`, `encoded_segments`. `path`, `segments`.