Match another rule, if the result is not empty

Synopsis

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

template<Rule R>
constexpr
/* implementation-defined */
not_empty_rule(R 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 ) ) );

Return Value

The adapted rule

Parameters

Name

Description

r

The rule to match

See Also

parse, pct_encoded_rule, unreserved_chars.

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