Re: [Boost-users] [conversion] Using Lexical_cast to convert string to float

Subject: Re: [Boost-users] [conversion] Using Lexical_cast to convert string to float
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-06-10 10:17:45

AMDG

Ryan McConnehey wrote:
> Steven Watanabe wrote:
>> The problem is in the standard library.  (Tested with msvc 9.0 
>> express--gcc 4.3.0 behaves sensibly).
> So, Microsoft's implementation is off?  It wouldn't be that surprising 
> though. :-)
>> ss: true, val: 1.#INF
>> ss: false, val: -9.25596e+061
> It looks like the "3.4e350" gets converted to a valid value (for 
> doubles) and the only way to determine if it was out of range is to do 
> a cast on the stream itself.

There are no guarantees about what val holds.

> Is this what lexical_cast does internally?

Yes.

In Christ,
Steven Watanabe