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[ceph.git] / ceph / src / boost / libs / phoenix / doc / starter_kit / references.qbk

[/==============================================================================
    Copyright (C) 2001-2010 Joel de Guzman
    Copyright (C) 2001-2005 Dan Marsden
    Copyright (C) 2001-2010 Thomas Heller

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
===============================================================================/]

[section References]

References are functions. They hold a reference to a value stored somewhere.
For example, given:

    int i = 3;
    char const* s = "Hello World";

we create `references` to `i` and `s` this way:

    ref(i)
    ref(s)

Like `val`, the expressions above evaluates to a nullary function; the first one
returning an `int&`, and the second one returning a `char const*&`.

(See [@../../example/references.cpp references.cpp])

[blurb __tip__ Learn more about references [link phoenix.modules.core.references here.]]

[endsect]