On 7/5/2015 3:15 PM, Christophe Henry wrote:

Michael Caisse wrote:

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Boost.Msm v3 also implements a new compile-time strings based front-end called eUML2 to demonstrate the power of the library and the conciseness and expressiveness it allows. Please have a look at the documentation:

https://htmlpreview.github.io/?https://raw.githubusercontent.com/boostorg/ms...

Christophe, this is wonderful work and a great example of the usefulness of Metaparse. Can you comment on the compile time compared to eUML?

Hi Michael,

sorry, I had completely forgotten this post and saw it while preparing the review results (which will be done soon).

Please allow me to answer this question, with my apologies.

I added in the msm3 branch a CompareFrontEnds.cpp example. It is a simple fsm with 12 transitions.

I tried with gcc-4.9 and clang-3.5, using -O2 on a i7-5960X processor, suse linux 13.2. Here are the results.

eUML

clang 4s

g++ 5s

eUML2

clang 9s

g++ 14s

Clang is clearly much faster than g++, with about 0.5s added compile-time per transition.

With g++ it does not look so good. I already noticed that compile times of most production code at work with g++ is much higher than with clang.

2x slower on clang and 3x slower on gcc is pretty significant I think.