reinterpret_cast works from smaller sizes to larger sizes.
So simply
reinterpret_cast<uint64_t *>(thread)
should work for both of our machines (size_t is uint64_t for me).
... until some pthread implementation decides to hand you a larger sized struct
for pthread_t.
> On Sep 20, 2017, at 3:26 PM, Juergen Sauermann
> <juergen.sauerm...@t-online.de> wrote:
>
> Hi Xiao-Yong,
>
> I can compile this:
>
> << reinterpret_cast<uint64_t>(
> reinterpret_cast<void *>(thread))
>
> Please let me know if it compiles on you box as well.
>
> Best Regards,
> Jürgen
>
>
> On 09/20/2017 10:00 PM, Juergen Sauermann wrote:
>> Hi Xiao-Yong,
>>
>> with reinterpret_cast<size_t> I am getting (gcc 4.8) this:
>>
>> Thread_context.cc: In member function ‘void
>> Thread_context::print(std::ostream&) const’:
>> Thread_context.cc:73:42: error: invalid cast from type ‘pthread_t {aka long
>> unsigned int}’ to type ‘size_t {aka unsigned int}’
>> << reinterpret_cast<size_t>(thread)
>> ^
>> make[1]: *** [apl-Thread_context.o] Error 1
>>
>> It seems a little ridiculous to me that replacing a good old C-style cast
>> that worked fine for the
>> last 10 years cannot be replaced by one of the 3 members of the C++ zoo of
>> casts in a portable way?
>>
>> Maybe some intermediate cast to const void * can be done on your machine?
>>
>> Best Regards,
>> Jürgen
>>
>>
>> On 09/19/2017 11:44 PM, Xiao-Yong Jin wrote:
>>> Should have got back to you sooner, but static_cast is not allowed between
>>> pointer types and non-pointer types.
>>>
>>> Thread_context.cc:73:11: error: static_cast from 'pthread_t' (aka
>>> '_opaque_pthread_t *') to 'int' is not allowed
>>> << static_cast<int>(thread)
>>> ^~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>> I need reinterpret_cast<size_t> here. I cannot reinterpret_cast<int>
>>> either, because of the difference in size.
>>>
>>>
>>>> On Sep 11, 2017, at 3:01 PM, Juergen Sauermann
>>>> <juergen.sauerm...@t-online.de>
>>>> wrote:
>>>>
>>>> Hi Xiao-Yong,
>>>>
>>>> I see. In this particular case the pthread_t is only used to identify a
>>>> thread and
>>>> to distinguish it from other threads for debugging purposes. So as long as
>>>> the
>>>> compiler does not complain about the cast everything is fine. Cast to void
>>>> * instead of
>>>> int would also be an option.
>>>>
>>>> /// Jürgen
>>>>
>>>>
>>>> On 09/11/2017 08:38 PM, Xiao-Yong Jin wrote:
>>>>
>>>>> I don't think there is a portable way of printing a variable of type
>>>>> pthread_t. It could be a struct, depending on the implementation.
>>>>> static_cast<int> is alright, but may not be useful in the future.
>>>>>
>>>>>
>>>>>
>>>>>> On Sep 11, 2017, at 1:08 PM, Juergen Sauermann
>>>>>> <juergen.sauerm...@t-online.de>
>>>>>>
>>>>>> wrote:
>>>>>>
>>>>>> Hi Xiao-Yong,
>>>>>>
>>>>>> thanks, maybe fixed in SVN 1011.
>>>>>> Problem with that error is that the casted type is not a pointer, at
>>>>>> least on my machine.
>>>>>>
>>>>>> /// Jürgen
>>>>>>
>>>>>>
>>>>>> On 09/11/2017 06:55 PM, Xiao-Yong Jin wrote:
>>>>>>
>>>>>>
>>>>>>> At revision 1010
>>>>>>>
>>>>>>> Thread_context.cc:72:65: error: cast from pointer to smaller type 'int'
>>>>>>> loses information
>>>>>>> out << "thread #" << setw(2) << N << ":" << setw(16) <<
>>>>>>> int(thread)
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>
>
