Johan Råde wrote:
At the suggestion of Robert Ramey's, I have put together facets for reading and writing non-finite numbers, such as infinity and not-a-number, to text streams, in a consistent and portable way.
The code, with documentation and tests, is available in the Boost Vault, serialization/non_finite_num_facets.zip.
If there is enough interest in the code, I will submit it for a mini-review, in order to have it added to the serialization lib.
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What does the code do?
The following test fails on VC++ 7.1:
stringstream s; double x = numeric_limits<double>::infinity(); double y; ss << x; ss >> y; assert(x == y);
The situation gets even worse when text files are required to be portable between different platforms.
But the following test succeeds:
stringstream s;
locale old_locale; locale tmp_locale(old_locale, new extended_num_put<char>); locale new_locale(tmp_locale, new extended_num_get<char>); s.imbue(new_locale);
double x = numeric_limits<double>::infinity(); double y; ss << x; ss >> y; assert(x == y);
For more info, read the documentation.
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--Johan Råde
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I have uploaded a revised version with a more robust is_nan function. The code is in the vault: serialization/non_finite_num_facets.zip. --Johan Råde