boost::urls::grammar::ref

Return a reference to a rule

Synopsis

Declared in <include/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

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