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| 14 | <div class="section" id="physical-structure"> |
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| 15 | <h1><a class="toc-backref" href="./technical-details.html#id71" name="physical-structure">Physical Structure</a></h1> |
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| 16 | <p>The library uses a fine-grained header structure with one header per public |
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| 17 | component (class/function template), with the header named after the component. For example, |
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| 18 | <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 |
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| 19 | scheme ensures both that we don't pay for what we don't use in terms of compilation time |
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| 20 | and header dependencies, and frees us from memorizing the |
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| 21 | relationship between a given header and the components it |
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| 22 | provides. For entities that are likely to be used together, |
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| 23 | such as arithmetic |
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| 24 | 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 |
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| 25 | appropriately-named composite headers |
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| 26 | (<tt class="literal"><span class="pre"><boost/mpl/airthmetic.hpp></span></tt>) as a convenience.</p> |
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