[Boost-users] lexical_cast tests failed

From: Chris Surridge (csurridge_at_[hidden])
Date: 2004-05-27 14:16:20

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