Ticket #6812 (closed Bugs: fixed)
boost::lexical_cast<float>(".") returns 0 instead of throwing
|Reported by:||Bruce Merry <bmerry@…>||Owned by:||apolukhin|
The attached program reports
boost::lexical_cast<float>(".") returns 0
when it should report an exception. According to the lexical_cast docs, lexical_cast<float>(string) is supposed to be equivalent to
- using stream extraction, which in turn is defined in terms of
- num_get on the numeric facet, which is defined in terms of
- strtold in the C standard, which requires
- "a non-empty sequence of decimal digits, optionally containing a decimal-point character"
strtold also refers to the grammar for a floating-point literal, which is pretty clear that either the part before or the part after the decimal point has to be non-empty. Compiler is MSVC 2010 SP1. I haven't messed around with locales at all so it's whatever the default is for an English install of Windows 7.
This works with Boost 1.46 under GCC 4.6 - I'm guessing because 1.46 left parsing of float strings to operator>>.
- Status changed from new to assigned
- Milestone changed from To Be Determined to Boost 1.50.0
- Status changed from assigned to closed
- Resolution set to fixed