libs/phoenix/doc/starter_kit/statement.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 Lazy Statements]

Lazy statements? Sure. There are lazy versions of the C++ statements we all know
and love. For example:

    if_(arg1 > 5)
    [
        std::cout << arg1
    ]

Say, for example, we wish to print all the elements that are greater than 5
(separated by a comma) in a vector. Here's how we write it:

    std::for_each(v.begin(), v.end(),
        if_(arg1 > 5)
        [
            std::cout << arg1 << ", "
        ]
    );

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

[blurb __tip__ Learn more about statements [link phoenix.modules.statement here.]]

[endsect]