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  10 <title>THE BOOST MPL LIBRARY: Physical Structure</title>
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  18 <h1><a class="toc-backref" href="./technical-details.html#id71" name="physical-structure">Physical Structure</a></h1>
  19 <p>The library uses a fine-grained header structure with one header per public
  20 component (class/function template), with the header named after the component. For example,
  21 <tt class="literal"><span class="pre">boost::mpl::apply</span></tt> is defined in the header <tt class="literal"><span class="pre">&lt;boost/mpl/apply.hpp&gt;</span></tt>. This
  22 scheme ensures both that we don't pay for what we don't use in terms of compilation time
  23 and header dependencies, and frees us from memorizing the
  24 relationship between a given header and the components it
  25 provides. For entities that are likely to be used together,
  26 such as arithmetic
  27 metafunctions (<tt class="literal"><span class="pre">plus</span></tt>, <tt class="literal"><span class="pre">minus</span></tt>, <tt class="literal"><span class="pre">times</span></tt>, et. al.), the library also supplies
  28 appropriately-named composite headers
  29 (<tt class="literal"><span class="pre">&lt;boost/mpl/airthmetic.hpp&gt;</span></tt>) as a convenience.</p>
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