boost::urls::grammar::ref
Return a reference to a rule
Synopsis
Declared in header <boost/url/grammar/parse.hpp>
template<class Rule>
constexpr
implementation-defined
ref(Rule const& r) noexcept;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.