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copied!<p>C++ is so slow to compile as the header files have to be reread and reparse every time they are included. Due to the way “#defines” work, it is very hard for a compiler to automatically pre-compile all header files. (Modula-2 made a much better job of this) Having 100s of headers read for each C++ file that is compiled is normal on a lot of C++ projects.</p> <p>Sometimes incremental c++ compiles can be a lot faster than C#. If you have all your C++ header files (and design) in a very good state (see books like <a href="http://rads.stackoverflow.com/amzn/click/0201633620" rel="nofollow noreferrer">Large-Scale C++ Software Design</a>, <a href="http://rads.stackoverflow.com/amzn/click/0321334876" rel="nofollow noreferrer">Effective C++</a>) You can make a change to the implementation of a class that is used by most of the system and only have one dll recompile.</p> <p>As C# does not have separate header files whenever you change the implantation of a class, all uses of the class get recompiled even if the public interface of the class has not changed. This can be reduced in C# by using “interface based programming” and “dependency injection” etc. But it is still a pain.</p> <p>However on the whole I find that C# compiles fast enough, but large C++ projects are so slow to compile that I find myself not wanting to add a methods to a “base class” due to the time of the rebuild.</p> <p>Having lots of Visual Studio projects with a handful of classes in each can slow down C# builds a lot. Combining related projects together and then “trusting” the developers not to use class that are private to a namespace can at times have a great benefit. (<a href="http://www.ndepend.com/" rel="nofollow noreferrer">nDepends</a> can be used to check for people breaking the rules)</p> <p>(When trying to speed up C++ compiles I have found FileMon very useful. One project I worked on, the STL was added to a header file and the build got a lot slower. Just adding STL to the precompiled header file made a big difference! Therefore track your build time and investigate when it gets slower)</p>

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