Hi all! I have worked with phoenix together with valarray and am currently stumbling over a case of segmentation fault. I construct the following phoenix expression boost::phoenix::at_c<0>(arg1) += boost::phoenix::at_c<1>(arg1) / val(mass) * arg2 I then feed a std::tuple<std::valarray<double>, std::valarray<double>> to it. It compiles nicely with gcc (4.6 & 4.7) using boost 1.52 as well as trunk. The resulting executable then proceeds to segfault, however. I have put together a small example (c++11) demonstrating my problem. The valarray's memory should already be reserved from original initialization. Performing the same operations manually with just the valarray not in phoenix seems to work fine. Am I missing something or doing something stupid here? thanks for any help! cheers Philipp