Boost C++ Libraries: Ticket #5660: reimplement conversions to float/double/long double types

Thomas Heller — Wed, 29 Jun 2011 16:53:33 GMT

You shouldn't compare floating point values with operator==, as explained here:
http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.16
http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.17
http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.18

status, summary changed

Antony Polukhin — Wed, 06 Jul 2011 15:40:48 GMT

status new → assigned
summary lexical_cast_loopback_test fails on some compilers → reimplement conversions to float/double/long double types

Antony Polukhin — Wed, 06 Jul 2011 15:52:54 GMT

Replying to theller:

You shouldn't compare floating point values with operator==, as explained here:
http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.16
http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.17
http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.18

Test lexical_cast_loopback_test is more like an exception from the rule. It is used to determinate the accuracy of the upcoming algorithm. Some of the compilers currently do not fail the test, so this test must continue to pass successfully on those compilers.
Other tests use BOOST_CHECK_CLOSE for floats.

Some work on this ticket has been already done in [72925].

Antony Polukhin — Tue, 24 Jul 2012 18:14:17 GMT

Fixing this ticket must also resolve #6975. See #6975 for more requirements.

status, milestone changed; resolution set

Antony Polukhin — Mon, 09 Mar 2015 08:48:48 GMT

status assigned → closed
resolution → wontfix
milestone To Be Determined → Boost 1.58.0

Since Boost 1.58 it is decided that lexical_cast must use converters from Sandard Library.