Bug in real_parser

There is a bug in real_parser, as an "ignored" exponent gives a wrong result.
Consider

double as_double(std::string const& s)
{
    double result;
    auto begin = std::begin(s);
    if (phrase_parse(begin,std::end(s),double_,space,d)) return -1;
    return d;
}

Now as_double("045.000W") returns 45, but as_double("045.000E") returns
45000.




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