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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.

Parameters

Name Description

r

The rule to use