Dear boost users, could someone tell me why this short program does not compile? #include #include int main(int argc, const char *argv[]) { boost::array a1 = {{1, 1, 1}}; BOOST_STATIC_ASSERT(a1.static_size == 3); return 0; } With g++ (4.3.4) I get the following error: tmp.cpp: In function ‘int main(int, const char**)’: tmp.cpp:7: error: ‘a1’ cannot appear in a constant-expression tmp.cpp:7: error: `.' cannot appear in a constant-expression tmp.cpp:7: error: template argument 1 is invalid With icc (12.1.6) I get the following error: tmp.cpp(7): error: this operator is not allowed in a template argument expression BOOST_STATIC_ASSERT(a1.static_size == 3); ^ tmp.cpp(7): error: incomplete type is not allowed BOOST_STATIC_ASSERT(a1.static_size == 3); ^ compilation aborted for tmp.cpp (code 2) However I can compile using IBM xlC compiler. I thought that static_size is a compile time constant and can be used in this context...