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From: Kevin Wheatley (hxpro_at_[hidden])
Date: 2006-03-16 04:21:51

Caleb Epstein wrote:
> Note that boost::lexical_cast uses a precision of
> std::numeric_limits<T>::digits10
> + 1 in its T-to-string conversions. For double, this is 16 which would
> probably explain the mismatch on the 17th significant digit on two separate
> platforms.

so it looks like lexical_cast has a bug (repeated) as well then see
Paul Bristow's comment earlier, here is the code in lexical_cast.hpp.


stream.precision(std::numeric_limits<Target>::digits10 + 1);
                else if(std::numeric_limits<Source>::is_specialized)
stream.precision(std::numeric_limits<Source>::digits10 + 1);

Should both be tweaked to add the extra digits:

stream.precision(2+std::numeric_limits<Target>::digits * 3010/10000);


stream.precision(2+std::numeric_limits<Source>::digits * 3010/10000);

or am I missing the boat on my quick inspection


| Kevin Wheatley, Cinesite (Europe) Ltd | Nobody thinks this      |
| Senior Technology                     | My employer for certain |
| And Network Systems Architect         | Not even myself         |

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