March 2008 - Boost-users - lists.preview.boost.org

templates: parts of functions
by Hicham Mouline 01 Mar '08

01 Mar '08

Hi, I have a function makeTree whose behavior depends on 3 different policies typename T1 typename T2 int N For performance reasons, I need to write the 2- and 3- specializations alongside the general N case. That is, the 2- and 3- default instantiations generated from the N case by the compiler are not optimal. As it is impossible to write function templates partial specializations, I encapsulate the template< typename T1, typename T2, int N> void makeTree(Head<N>&, const T2&, const C&) ; function in a class template template< typename T1, typename T2, int N> class makeTree{ void makeTree(Head<N>&, const T2&, const C&); }; and write the partial specializations <T1,T2,2> and <T1,T2,3>. Now, this makeTree function is quite large. It includes code that : . doesn't depend on any of the template arguments . code that depends only T1 . code that depends only on T2 . code that depends only on N . code that depends only on <T1,N>. I am worried about code bloat, and the effect on overall performance of the actual code generated even if it is not run (I noticed substantial effects depending on the size of object files and final shared library generated). Besides this, I suppose it is a better design to have these segments of code put in template functions with the right template arguments. Is it MPL the library that I should look into for such work? Perhaps nothing in Boost particularly facilitates this work, and std c++ templates are enough, Thoughts, comments are appreciated, Rds,

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static assert
by Hicham Mouline 01 Mar '08

01 Mar '08

hi, I would like to avoid template instantiations with ContractType whose static functions st1 and st2 return an enum... template <typename ContractType> class C { BOOST_STATIC_ASSERT( !(ContractType::st1()==A && ContractType::st2()==P) ); ... }; Is there a way to make this work?

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Re: [Boost-users] A request for help using the Boost Unit Test Library
by Tim Allison 01 Mar '08

01 Mar '08

> > Tim Allison <tallison <at> meicompany.com> writes: > >> I ran the -E option on the Gnu compiler. Here is what I hope is the >> relevant output (at the end of the 38K resulting file!): > > [...] > >> # 20 "/usr/include/boost/test/unit_test.hpp" 2 3 4 > > [...] > >> BOOST_AUTO_TEST_CASE( test1 ) > > Looks like this is Boost 1.33. You need 1.34 to build examples in new docs. > > Gennadiy > > Where do I find examples for Boost 1.33? Based on your previous remarks, I used: http://www.boost.org/libs/test/example/unit_test_example_01.cpp It is copyrighted 2005. Tim Allison

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