Have you tried:
typedef mpl::string<'hell','o wo','rld'>::type my_hello;
? BOOST_MPL_LIMIT_STRING_SIZE is a count of "characters" in the mpl::string, which is 4X the number of template parameters, since mpl::string uses multi-character literals to pack 4 characters into an int.
Thanks, Eric. This is from the examples and works. But there rises the question how to use slightly longer mpl strings. Further more, using this emits a compiler warning about multichar literal (or similar) on gcc. Generally disabling this warning may prevent detection of issues on other places. A similar compile problem I have with typedef mpl::char<'A'>::type my_A; int main() { std::cout << mpl::c_str<my_A>::value << '\n'; } but I haven't a compiler at the hand here. Thanks, Olaf