ceph/src/boost/libs/phoenix/doc/starter_kit/statement.qbk

   1 [/==============================================================================
   2     Copyright (C) 2001-2010 Joel de Guzman
   3     Copyright (C) 2001-2005 Dan Marsden
   4     Copyright (C) 2001-2010 Thomas Heller
   5
   6     Distributed under the Boost Software License, Version 1.0. (See accompanying
   7     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   8 ===============================================================================/]
   9
  10 [section Lazy Statements]
  11
  12 Lazy statements? Sure. There are lazy versions of the C++ statements we all know
  13 and love. For example:
  14
  15     if_(arg1 > 5)
  16     [
  17         std::cout << arg1
  18     ]
  19
  20 Say, for example, we wish to print all the elements that are greater than 5
  21 (separated by a comma) in a vector. Here's how we write it:
  22
  23     std::for_each(v.begin(), v.end(),
  24         if_(arg1 > 5)
  25         [
  26             std::cout << arg1 << ", "
  27         ]
  28     );
  29
  30 (See [@../../example/if.cpp if.cpp])
  31
  32 [blurb __tip__ Learn more about statements [link phoenix.modules.statement here.]]
  33
  34 [endsect]