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- <h1><a class="toc-backref" href="./technical-details.html#id71" name="physical-structure">Physical Structure</a></h1>
- <p>The library uses a fine-grained header structure with one header per public
- component (class/function template), with the header named after the component. For example,
- <tt class="literal"><span class="pre">boost::mpl::apply</span></tt> is defined in the header <tt class="literal"><span class="pre"><boost/mpl/apply.hpp></span></tt>. This
- scheme ensures both that we don't pay for what we don't use in terms of compilation time
- and header dependencies, and frees us from memorizing the
- relationship between a given header and the components it
- provides. For entities that are likely to be used together,
- such as arithmetic
- 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
- appropriately-named composite headers
- (<tt class="literal"><span class="pre"><boost/mpl/airthmetic.hpp></span></tt>) as a convenience.</p>
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