Measuring Compilation Time of C++ Template Metaprograms Zolt·an Porkol·ab

Template metaprograms have become an essential part of today's C++ programs. Despite their importance there are surprisingly few tools for creating, using and analysing them efciently. The radi-cally increased compilation time of programs using template-heavy code is one of the phenomena of which root is a serious challange to trace down. The compilation speed can increase when one starts using even less complex template metaprogram structures. Indus-trial projects pay a big price for these additional times. Our paper presents intrusive and non-intrusive approaches of getting detailed information on the compilation process of templates and measur-ing time each specic template instantiations had taken. The results show the pros and cons of the different techniques, comparing them across different compilers. In an example we demonstrate how to identify the bottleneck and how to improve template metaprograms regarding compilation time