RE: [Boost-users] lexical_cast tests failed

From: Rozental, Gennadiy (gennadiy.rozental_at_[hidden])
Date: 2004-05-27 15:19:53

> I was testing out lexical_cast, and I would expect that for 
> any value v of type T, it should be true that
> 
> v == lexical_cast<T>(lexical_cast<string>(v))
> 
> but this does not appear to work for float or double in all 
> cases. In particular, the following tests failed:
> 
> float value = numeric_values<float>::min(); 
> BOOST_CHECK_EQUAL(value, 
> lexical_cast<float>(lexical_cast<string>(value)));
> value = numeric_values<float>::max();
> BOOST_CHECK_EQUAL(value, 
> lexical_cast<float>(lexical_cast<string>(value)));
> 
> double dvalue = numeric_values<double>::min(); 
> BOOST_CHECK_EQUAL(dvalue, 
> lexical_cast<double>(lexical_cast<string>(dvalue)));
> dvalue = numeric_values<double>::max(); 
> BOOST_CHECK_EQUAL(dvalue, 
> lexical_cast<double>(lexical_cast<string>(dvalue)));
> 
> Should I have expected these tests to pass?
> 
> thanks,
> 
> --chris

Try to use BOOST_CHECK_CLOSE instead. Don't use BOOST_CHECK_EQUAL to compare
floats.

Gennadiy.