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.