1 [/==============================================================================
2 Copyright (C) 2001-2010 Joel de Guzman
3 Copyright (C) 2001-2005 Dan Marsden
4 Copyright (C) 2001-2010 Thomas Heller
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 ===============================================================================/]
12 Arguments are also functions? You bet!
14 Until now, we have been dealing with expressions returning a nullary function.
15 Arguments, on the other hand, evaluate to an N-ary function. An argument
16 represents the Nth argument. There are a few predefined arguments arg1,
17 arg2, arg3, arg4 and so on (and it's __bll__ counterparts: _1, _2, _3, _4 and so
20 arg1 // one-or-more argument function that returns its first argument
21 arg2 // two-or-more argument function that returns its second argument
22 arg3 // three-or-more argument function that returns its third argument
24 `argN` returns the Nth argument. Examples:
27 char const* s = "Hello World";
28 std::cout << arg1(i) << std::endl; // prints 3
29 std::cout << arg2(i, s) << std::endl; // prints "Hello World"
31 (See [@../../example/arguments.cpp arguments.cpp])
33 [blurb __tip__ Learn more about arguments [link phoenix.modules.core.arguments here.]]