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2004-11-28 03:35:12 +00:00
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< title > THE BOOST MPL LIBRARY: Physical Structure</ title >
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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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