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Gennadiy Rozental

19 Nov 2011 19 Nov '11

8:56 a.m.

Hi, I am zipping fusion sequences in a series of incremental zip operations: zip(zip(zip(a,b),c),...) as a result I am getting sequence with elements like: vector2,c[i]>,...> what I want instead is that elements would look like: vector What the simplest way to achieve this? Gennadiy

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Christopher Schmidt

19 Nov 19 Nov

10:22 a.m.

Gennadiy Rozental writes:

Hi,

I am zipping fusion sequences in a series of incremental zip operations:

zip(zip(zip(a,b),c),...)

as a result I am getting sequence with elements like:

vector2,c[i]>,...>

what I want instead is that elements would look like:

vector

What the simplest way to achieve this?

--8<---------------cut here---------------start------------->8--- #include #include #include #include #include #include <iostream> int main() { using namespace boost::fusion; vector a(0,1),b(1,2),c(2,3); auto v=push_back( push_back( push_back( make_vector(),boost::ref(a)),boost::ref(b)),boost::ref(c)); auto z=zip_view(v); std::cout << z << std::endl; } --8<---------------cut here---------------end--------------->8--- Christopher

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Gennadiy Rozental

10:44 p.m.

Christopher Schmidt writes:

auto v=push_back( push_back( push_back( make_vector(),boost::ref(a)),boost::ref(b)),boost::ref(c)); auto z=zip_view(v);

This is not what I want. Let @ denote zipping operation. I want: x = a @ b // x == ((0,1),(1,2)) ... y = x @ c // y = ((0,1,2),(1,2,3)) Right now I am getting y = (((0,1),2),((1,2),3)) Gennadiy P.S. You example does not work for me push_back.hpp does not build under MSVC10

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Joel de Guzman

11:16 p.m.

On 11/20/2011 6:44 AM, Gennadiy Rozental wrote:

Christopher Schmidt writes:

...
auto v=push_back( push_back( push_back( make_vector(),boost::ref(a)),boost::ref(b)),boost::ref(c)); auto z=zip_view(v);

This is not what I want. Let @ denote zipping operation. I want:

x = a @ b // x == ((0,1),(1,2)) ... y = x @ c // y = ((0,1,2),(1,2,3))

Right now I am getting y = (((0,1),2),((1,2),3))

Gennadiy

P.S. You example does not work for me push_back.hpp does not build under MSVC10

Builds fine with me using both VC2010 and g++. Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com

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Gennadiy Rozental

20 Nov 20 Nov

2:15 a.m.

Joel de Guzman writes:

Builds fine with me using both VC2010 and g++.

After I just include this: #include I am getting this from express edition: 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(261): error C2146: syntax error : missing ',' before identifier 'push_back' 1> ...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(279) : see reference to class template instantiation 'boost::fusion::detail::make_segment_sequence_back' being compiled 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(261): error C2065: 'push_back' : undeclared identifier 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(262): error C2275: 'boost::fusion::detail::make_segment_sequence_back::rest_type' : illegal use of this type as an expression 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(262): error C2143: syntax error : missing ',' before 'const' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(265): warning C4517: access-declarations are deprecated; member using-declarations provide a better alternative 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(265): warning C4346: 'boost::fusion::detail::segment_sequence::type>::type' : dependent name is not a type 1> prefix with 'typename' to indicate a type 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(265): error C2143: syntax error : missing ';' before '>' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(266): error C2238: unexpected token(s) preceding ';' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(268): error C2146: syntax error : missing ';' before identifier 'call' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(268): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(268): error C2086: 'segment_sequenceStack::cdr_type::type>::type type' : redefinition 1> ...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(265) : see declaration of 'boost::fusion::detail::make_segment_sequence_back::operator type' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(268): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(269): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(278): warning C4183: 'call': missing return type; assumed to be a member function returning 'int' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(394): error C2146: syntax error : missing ',' before identifier 'push_back' 1> ...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(421) : see reference to class template instantiation 'boost::fusion::detail::make_segmented_range_reduce2' being compiled 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(394): error C2065: 'push_back' : undeclared identifier 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(399): warning C4346: 'Stack::size::value' : dependent name is not a type 1> prefix with 'typename' to indicate a type 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(399): error C2226: syntax error : unexpected type 'boost::fusion::result_of::push_frontStackBegin::car_type::begin_type ::type,StackEnd::car_type::begin_type>,make_segment_sequence_front<StackBegin> ::type>::type' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(401): warning C4517: access-declarations are deprecated; member using-declarations provide a better alternative 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(401): warning C4346: 'boost::fusion::detail::segment_sequence::type' : dependent name is not a type 1> prefix with 'typename' to indicate a type 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(401): error C2143: syntax error : missing ';' before '>' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(402): error C2238: unexpected token(s) preceding ';' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(404): error C2146: syntax error : missing ';' before identifier 'call' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(404): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(404): error C2086: 'segment_sequence::type type' : redefinition 1> ...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(401) : see declaration of 'boost::fusion::detail:: make_segmented_range_reduce2::operator type' 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(404): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(405): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>...\boost\fusion\view\iterator_range\detail\segmented_iterator_range.hpp(420): warning C4183: 'call': missing return type; assumed to be a member function returning 'int' What about original question BTW? Do you have a suggestion? Gennadiy

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Joel de Guzman

11:02 a.m.

On 11/20/2011 10:15 AM, Gennadiy Rozental wrote:

Joel de Guzman writes:

...
Builds fine with me using both VC2010 and g++.

After I just include this: #include

I am getting this from express edition:

You might want to update from SVN. There's been some recent bug fixes in trunk and release.

What about original question BTW? Do you have a suggestion?

I'll look into it later tonight. I need to understand better what you want. Right now, I'm in Sunday mode ;-) Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com

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Christopher Schmidt

1:30 p.m.

Gennadiy Rozental writes:

Christopher Schmidt writes:

...
auto v=push_back( push_back( push_back( make_vector(),boost::ref(a)),boost::ref(b)),boost::ref(c)); auto z=zip_view(v);

This is not what I want. Let @ denote zipping operation. I want:

x = a @ b // x == ((0,1),(1,2)) ... y = x @ c // y = ((0,1,2),(1,2,3))

Right now I am getting y = (((0,1),2),((1,2),3))

Gennadiy

P.S. You example does not work for me push_back.hpp does not build under MSVC10

That's a tough questions. You cannot unzip a zip_view, add another sequence, and zip it again. I'd either use transform to flatten the nested zip_view's, or I'd store the sequences separately and rebuild the zip_view every time on the fly. Christopher

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Robert Ramey

5:54 p.m.

Gennadiy Rozental wrote:

Hi,

I am zipping fusion sequences in a series of incremental zip operations:

zip(zip(zip(a,b),c),...)

as a result I am getting sequence with elements like:

vector2,c[i]>,...>

what I want instead is that elements would look like:

vector

What the simplest way to achieve this?

Gennadiy

I think what you want is "deduce_sequence" - it's in the docs Robert Ramey

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Gennadiy Rozental

23 Nov 23 Nov

10:50 a.m.

Robert Ramey writes:

Gennadiy Rozental wrote:

...
zip(zip(zip(a,b),c),...) what I want: vector

I think what you want is "deduce_sequence" - it's in the docs

I am not that well versed in fusion. I do not see how to apply this. can someone show an example? Gennadiy

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participants (4)

Christopher Schmidt
Gennadiy Rozental
Joel de Guzman
Robert Ramey