Re: [Boost-users] [date_time] Memory leak in io example?

Subject: Re: [Boost-users] [date_time] Memory leak in io example?
From: Jim Bell (Jim_at_[hidden])
Date: 2011-02-17 14:16:37

On 1:59 PM, John Maddock wrote:
>> In the example code under Date Time Input/Output
>> <http://www.boost.org/doc/libs/1_45_0/doc/html/date_time/date_time_io.html>,
>>
>> "A simple example of this new system:", it shows a date_facet being
>> constructed with new, then a locale constructed with it, and finally
>> ios::imbue called on that.
>>
>>> From what I can tell from locale's constructors
>> <http://stdcxx.apache.org/doc/stdlibref/locale.html#idx811> and imbue,
>> neither will own/release that pointer.
>>
>> True?
>
> False I believe: all facet types derive from std::locale::facet, which
> is a reference counted class.  As long as the reference count starts
> off at 0 when the facet is constructed, and then to quote from
> "22.1.1.1.2":
>
> "The refs argument to the constructor is used for lifetime management.
> - For refs == 0, the implementation performs delete
> static_cast<locale::facet*>(f)
> (where f is a pointer to the facet) when the last locale object
> containing the facet is destroyed; for
> refs == 1, the implementation never destroys the facet."

Thanks!   And even Apache's docs are vindicated
(<http://stdcxx.apache.org/doc/stdlibref/locale.html#idx809>), though I
doubt I would have found it on my own.