boost::urls::grammar::ref

Return a reference to a rule

Synopsis

Declared in <boost/url/grammar/parse.hpp>
template<Rule R>
constexpr
/* implementation-defined */
ref(R const& r) noexcept
requires is_rule<R>::value &&
    ! std::is_same<R,
        implementation_defined::rule_ref<R> >::value;

Description

This function returns a rule which references the specified object. This is used to reduce the number of bytes of storage (sizeof) required by a combinator when it stores a copy of the object. Ownership of the object is not transferred; the caller is responsible for ensuring the lifetime of the object is extended until it is no longer referenced. For best results, ref should only be used with compile-time constants.

Return Value

The rule as a reference type

Parameters

Name Description
r The rule to use

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