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## Organization

The library is organized into layers of modules, with each module addressing a particular area of responsibility. A module may not depend on modules in higher layers.

The library is organized in three layers:

#### Layers

The entire library is found in the `"boost/fusion"` directory. Modules are organized in directories. Each module has its own header file placed in the same directory with the actual module-directory. For example, there exists `"boost/fusion/support.hpp"` in the same directory as "boost/fusion/support". Everything, except those found inside "detail" directories, is public.

There is also a `"boost/fusion/include/"` directory that contains all the headers to all the components and modules. If you are unsure where to find a specific component or module, or don't want to fuss with hierarchy and nesting, use this.

The library is header-only. There is no need to build object files to link against.

#### Directory

- tuple
- algorithm
  - iteration
  - query
  - transformation
- adapted
  - array
  - mpl
  - boost::tuple
  - std_pair
  - struct
  - variant
- view
  - filter_view
  - iterator_range
  - joint_view
  - reverse_view
  - single_view
  - transform_view
  - zip_view
- container
  - deque
  - list
  - map
  - set
  - vector
  - generation
- mpl
- functional
- sequence
  - comparison
  - intrinsic
  - io
- iterator
- support

#### Example

If, for example, you want to use `list`, depending on the granularity that you desire, you may do so by including one of

    #include <boost/fusion/container.hpp>
    #include <boost/fusion/include/container.hpp>
    #include <boost/fusion/container/list.hpp>
    #include <boost/fusion/include/list.hpp>

The first includes all containers The second includes only `list` [4] .

[4] Modules may contain smaller components. Header file information for each component will be provided as part of the component's documentation.