73ef4ff3
 Hu Chunming
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[/
/ Copyright (c) 2008 Eric Niebler
/
/ 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:naming Naming Conventions]
[/================================]
Proto is a large library and probably quite unlike any library you've used
before. Proto uses some consistent naming conventions to make it easier to
navigate, and they're described below.
[/================]
[heading Functions]
[/================]
All of Proto's functions are defined in the `boost::proto` namespace. For
example, there is a function called `value()` defined in `boost::proto` that
accepts a terminal expression and returns the terminal's value.
[/====================]
[heading Metafunctions]
[/====================]
Proto defines /metafunctions/ that correspond to each of Proto's free functions.
The metafunctions are used to compute the functions' return types. All of
Proto's metafunctions live in the `boost::proto::result_of` namespace and
have the same name as the functions to which they correspond. For instance,
there is a class template `boost::proto::result_of::value<>` that you can
use to compute the return type of the `boost::proto::value()` function.
[/=======================]
[heading Function Objects]
[/=======================]
Proto defines /function object/ equivalents of all of its free functions. (A
function object is an instance of a class type that defines an `operator()`
member function.) All of Proto's function object types are defined in the
`boost::proto::functional` namespace and have the same name as their
corresponding free functions. For example, `boost::proto::functional::value`
is a class that defines a function object that does the same thing as the
`boost::proto::value()` free function.
[/===========================]
[heading Primitive Transforms]
[/===========================]
Proto also defines /primitive transforms/ -- class types that can be used
to compose larger transforms for manipulating expression trees. Many of
Proto's free functions have corresponding primitive transforms. These live
in the `boost::proto` namespace and their names have a leading underscore.
For instance, the transform corresponding to the `value()` function is
called `boost::proto::_value`.
The following table summarizes the discussion above:
[table Proto Naming Conventions
[[Entity] [Example] ]
[[Free Function] [`boost::proto::value()`] ]
[[Metafunction] [`boost::proto::result_of::value<>`] ]
[[Function Object] [`boost::proto::functional::value`] ]
[[Transform] [`boost::proto::_value`] ]
]
[endsect]
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