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url_view_base::has_scheme

Return true a scheme is present.

Synopsis
bool
has_scheme() const;
Description

This function returns true if this contains a scheme.

Example
assert( [link url.ref.boost__urls__url_view_base.url_view `url_view`]( "http://www.example.com" ).[link url.ref.boost__urls__url_view_base.has_scheme `has_scheme`]() );
Complexity

Constant.

Exception Safety

Throws nothing.

BNF
URI             = [link url.ref.boost__urls__url_view_base.scheme `scheme`] ":" hier-part [ "?" [link url.ref.boost__urls__url_view_base.query `query`] ] [ "#" [link url.ref.boost__urls__url_view_base.fragment `fragment`] ]

absolute-URI    = [link url.ref.boost__urls__url_view_base.scheme `scheme`] ":" hier-part [ "?" [link url.ref.boost__urls__url_view_base.query `query`] ]

[link url.ref.boost__urls__url_view_base.scheme `scheme`]          = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
Specification
See Also

scheme, scheme_id.


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