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- [/==============================================================================
- 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 Arguments]
- Arguments are also functions? You bet!
- Until now, we have been dealing with expressions returning a nullary function.
- Arguments, on the other hand, evaluate to an N-ary function. An argument
- represents the Nth argument. There are a few predefined arguments arg1,
- arg2, arg3, arg4 and so on (and it's __bll__ counterparts: _1, _2, _3, _4 and so
- on). Examples:
- arg1 // one-or-more argument function that returns its first argument
- arg2 // two-or-more argument function that returns its second argument
- arg3 // three-or-more argument function that returns its third argument
- `argN` returns the Nth argument. Examples:
- int i = 3;
- char const* s = "Hello World";
- std::cout << arg1(i) << std::endl; // prints 3
- std::cout << arg2(i, s) << std::endl; // prints "Hello World"
- (See [@../../example/arguments.cpp arguments.cpp])
- [blurb __tip__ Learn more about arguments [link phoenix.modules.core.arguments here.]]
- [endsect]
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