Blitz Support :

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From: Julian Cummings (cummings_at_[hidden])
Date: 2004-06-18 22:28:10

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In reply to: Julian Cummings: "Re: [Blitz-support] array iterators"
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I went ahead and made the necessary changes to the blitz array iterator
types ArrayIterator and ConstArrayIterator to make the behavior
STL-compliant. The postfix operator++ now
returns a const reference to the state of the iterator before the
increment as it should. Also,
there are specializations of the struct std::iterator_traits<> provided
for ArrayIterator and ConstArrayIterator. I have enhanced the iter.cpp
testsuite code to exercise the new features.
Please check this out from the cvs repository and let me know if you
encounter problems.

Regards, Julian C.

Julian Cummings wrote:

> Hi Patrik,
>
> This is a problem with the blitz array iterators. They are not
> currently STL compliant. There have been questions about this from
> time to time on the blitz support mailing list. I don't think there
> is any fundamental reason why we cannot make the blitz array iterators
> STL compliant by adding the expected typedefs and so forth. A couple
> of months ago someone else wrote in and mentioned that they had
> patched the blitz array iterator code to address this problem. I
> replied to him and invited him to submit a patch for inclusion in the
> blitz repository, but I don't believe I got a response. I just sent a
> note to that person asking again if he can submit his proposed patch.
> If not, I believe all that is required is to derive the blitz array
> iterator class from std::forward_iterator and fix up the behavior of
> the prefix and postfix operator++ to be standard-compliant. Shouldn't
> be that hard to make these changes.
>
> Regards, Julian C.
>
>
> Patrik Jonsson wrote:
>
>> Hello,
>>
>> I'm trying to construct a vector from an array using:
>> Array<double,1> a;
>> vector<double> v(a.begin(),a.end());
>>
>> but it doesn't work. I'm getting compiler errors saying that the
>> array iterator class is lacking typedefs (see below). Is this a
>> problem with the blitz iterators, or am I doing something wrong?
>>
>> Regards,
>>
>> /Patrik
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/iterator", line 43:
>> error: class
>> "blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>"
>> has no member "value_type"
>> typedef typename Iterator::value_type value_type;
>> ^
>> detected during:
>> instantiation of class "std::iterator_traits<Iterator> [with
>>
>> Iterator=blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>]" at line 69 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "void std::vector<T,
>> Allocator>::_initialize(InputIterator,
>> InputIterator,
>> std::vector<T, Allocator>::_Helper<false> *) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 128 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "std::vector<T,
>> Allocator>::vector(InputIterator,
>> InputIterator, const Allocator &) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 994 of
>> "mcrx-extras.cc"
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/iterator", line 44:
>> error: class
>> "blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>"
>> has no member "difference_type"
>> typedef typename Iterator::difference_type difference_type;
>> ^
>> detected during:
>> instantiation of class "std::iterator_traits<Iterator> [with
>>
>> Iterator=blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>]" at line 69 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "void std::vector<T,
>> Allocator>::_initialize(InputIterator,
>> InputIterator,
>> std::vector<T, Allocator>::_Helper<false> *) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 128 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "std::vector<T,
>> Allocator>::vector(InputIterator,
>> InputIterator, const Allocator &) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 994 of
>> "mcrx-extras.cc"
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/iterator", line 45:
>> error: class
>> "blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>"
>> has no member "pointer"
>> typedef typename Iterator::pointer pointer;
>> ^
>> detected during:
>> instantiation of class "std::iterator_traits<Iterator> [with
>>
>> Iterator=blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>]" at line 69 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "void std::vector<T,
>> Allocator>::_initialize(InputIterator,
>> InputIterator,
>> std::vector<T, Allocator>::_Helper<false> *) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 128 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "std::vector<T,
>> Allocator>::vector(InputIterator,
>> InputIterator, const Allocator &) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 994 of
>> "mcrx-extras.cc"
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/iterator", line 46:
>> error: class
>> "blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>"
>> has no member "reference"
>> typedef typename Iterator::reference reference;
>> ^
>> detected during:
>> instantiation of class "std::iterator_traits<Iterator> [with
>>
>> Iterator=blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>]" at line 69 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "void std::vector<T,
>> Allocator>::_initialize(InputIterator,
>> InputIterator,
>> std::vector<T, Allocator>::_Helper<false> *) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 128 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "std::vector<T,
>> Allocator>::vector(InputIterator,
>> InputIterator, const Allocator &) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 994 of
>> "mcrx-extras.cc"
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/iterator", line 47:
>> error: class
>> "blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>"
>> has no member "iterator_category"
>> typedef typename Iterator::iterator_category iterator_category;
>> ^
>> detected during:
>> instantiation of class "std::iterator_traits<Iterator> [with
>>
>> Iterator=blitz::ArrayIterator<blitz::Array<mcrx::T_float,
>> 1>::T_numtype, 1>]" at line 69 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "void std::vector<T,
>> Allocator>::_initialize(InputIterator,
>> InputIterator,
>> std::vector<T, Allocator>::_Helper<false> *) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 128 of
>>
>> "/usr/common/usg/KCC/4.0f9/KCC_BASE/include/vector"
>> instantiation of "std::vector<T,
>> Allocator>::vector(InputIterator,
>> InputIterator, const Allocator &) [with
>> T=mcrx::T_float,
>> Allocator=std::allocator<mcrx::T_float>,
>>
>> InputIterator=blitz::ArrayIterator<blitz::Array<mcrx::T_f
>> loat, 1>::T_numtype, 1>]" at line 994 of
>> "mcrx-extras.cc"
>> ============================================================
>> Patrik Jonsson (831) 459-3809
>> Department of Astronomy & Astrophysics
>> University of California, Santa Cruz, CA 95064
>>
>> This message has been written using a voice recognition system.
>> Words that don't make sense or not the fault of the author...
>>
>> _______________________________________________
>> Blitz-support mailing list
>> Blitz-support_at_[hidden]
>> http://www.oonumerics.org/mailman/listinfo.cgi/blitz-support
>
>
>

-- 
Dr. Julian C. Cummings                       E-mail: cummings_at_[hidden]
California Institute of Technology           Phone:  626-395-2543
1200 E. California Blvd., Mail Code 158-79   Fax:    626-584-5917
Pasadena, CA 91125

Next message: Alok Ahuja: "[Blitz-support] problem with installation"
Previous message: Julian C. Cummings: "RE: [Blitz-support] building from cvs (again)"
In reply to: Julian Cummings: "Re: [Blitz-support] array iterators"
Next in thread: carlos.rega_at_[hidden]: "RE: [Blitz-support] Template support in VC++ .NET"

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