boost split usage

I have a string of format [id1,id2,id3]. i'm using boost split to split the string and fill it in a vector.

boost::split(ids, message, boost::is_any_of("[, ]"));

ids is my vector declared a开发者_StackOverflow中文版s std::vector<std::string> ids.

now only the odd indices of the vector contains the ids, the even ones are empty. can anyone tell me what could be the reason and how to fix it.

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boost::algorithm::split( ids, message, boost::is_any_of("[, ]"),
                         boost::algorithm::token_compress_on );