Re: [boost] [chrono] New Features + Bug fixes + Updateddocumentation

Subject: Re: [boost] [chrono] New Features + Bug fixes + Updateddocumentation
From: Howard Hinnant (howard.hinnant_at_[hidden])
Date: 2009-12-11 12:21:43

On Dec 11, 2009, at 12:04 PM, vicente.botet wrote:

> Hi,
> ----- Original Message ----- 
> From: "Howard Hinnant" <howard.hinnant_at_[hidden]>
> To: <boost_at_[hidden]>
> Sent: Friday, December 11, 2009 5:20 PM
> Subject: Re: [boost] [chrono] New Features + Bug fixes + Updateddocumentation
> 
> 
>> 
>> On Dec 11, 2009, at 3:37 AM, vicente.botet wrote:
>> 
>>> There is yet an error with gcc-4.4.0
>>> 
>>> ./boost/chrono/chrono.hpp:945: error: declaration of 'typedef class boost::chrono::duration<long long int, boost::ratio<1ll, 10000000ll> > boost::chrono::system_clock::duration'
>>> ./boost/chrono/chrono.hpp:458: error: changes meaning of 'duration' from 'class boost::chrono::duration<long long int, boost::ratio<1ll, 10000000ll> >'
>>> 
>>> Note that the line numbers will be no more significant. It corresponds to the following
>>> 
>>> namespace chrono {
>>> 
>>>   template <class Rep, class Period>
>>>   class duration
>>>   {...}
>>> 
>>> class BOOST_CHRONO_DECL system_clock
>>> {
>>> public:
>>>     typedef BOOST_SYSTEM_CLOCK_DURATION          duration;
>>>   ...
>>> };
>>> }
>>> 
>>> where
>>> 
>>> #ifdef BOOST_CHRONO_WINDOWS_API
>>> // The system_clock tick is 100 nanoseconds
>>> # define BOOST_SYSTEM_CLOCK_DURATION duration<boost::int_least64_t, ratio<BOOST_INTMAX_C(1), BOOST_INTMAX_C(10000000)> >
>>> #else
>>> # define BOOST_SYSTEM_CLOCK_DURATION boost::chrono::nanoseconds
>>> #endif
>> 
>> Try qualifying "duration" with "chrono::" in BOOST_SYSTEM_CLOCK_DURATION:
>> 
>> # define BOOST_SYSTEM_CLOCK_DURATION chrono::duration<boost::int_least64_t, ...
> 
> This could help if the warning was for windows API, but unfortunately it was reported be gcc-4.4.0 and also by  gcc-4.3.4 :(

Try a preprocess (-E) and make sure system_clock looks the way you think it should.  This could be a configuration error.  I just copy/pasted your sandbox chrono.hpp into a test file and compiled it fine using gcc-4.4.0.

-Howard