boost::urls::grammar::not_empty_rule

Match another rule, if the result is not empty

Synopsis

Declared in header <boost/url/grammar/not_empty_rule.hpp>

template<class Rule>
constexpr
implementation-defined
not_empty_rule(Rule const& r);

Description

This adapts another rule such that when an empty string is successfully parsed, the result is an error.

Value Type

using value_type = typename Rule::value_type;

Example

Rules are used with the function parse .

system::result< decode_view > rv = parse( "Program%20Files",
    not_empty_rule( pct_encoded_rule( unreserved_chars ) ) );

Parameters

Name	Description
r	The rule to match

See Also

parse , pct_encoded_rule , unreserved_chars .