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boost-users [pointer containers] stl set_unions

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chun ping wang

28 Nov 2007 28 Nov '07

6:39 a.m.

is it possible to use stl set_unions with ptr_container or do I have to hand roll my own. if yes what inserter should i use or how would i use two containers having pointer of int ptr_vector<int> a1; ptr_vector<int> a2; have a1 union a2 and store in a3.

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Thorsten Ottosen

28 Nov 28 Nov

1:38 p.m.

chun ping wang skrev:

is it possible to use stl set_unions with ptr_container or do I have to hand roll my own. if yes what inserter should i use or how would i use two containers having pointer of int ptr_vector<int> a1; ptr_vector<int> a2;

have a1 union a2 and store in a3.

Should be possible, but you need a different out-put iterator compared to e.g. std::back_inserter( a_normal_container ). Specifically, you need to call a3's clone_allocators' allocate_clone() in the call to push_back(). -Thorsten

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chun ping wang

7:28 p.m.

hmm can you give a small example of what you mean.. calling clone_allocators' allocate clone On Nov 28, 2007 5:38 AM, Thorsten Ottosen wrote:

chun ping wang skrev:

...
is it possible to use stl set_unions with ptr_container or do I have to hand roll my own. if yes what inserter should i use or how would i use two containers having pointer of int ptr_vector<int> a1; ptr_vector<int> a2;

have a1 union a2 and store in a3.

Should be possible, but you need a different out-put iterator compared to e.g. std::back_inserter( a_normal_container ).

Specifically, you need to call a3's clone_allocators' allocate_clone() in the call to push_back().

-Thorsten _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Thorsten Ottosen

10:44 p.m.

chun ping wang skrev:

hmm can you give a small example of what you mean.. calling clone_allocators' allocate clone

Calling new_clone() is probably sufficient for most purposes. -Thorsten

On Nov 28, 2007 5:38 AM, Thorsten Ottosen mailto:thorsten.ottosen@dezide.com> wrote:

chun ping wang skrev: > is it possible to use stl set_unions with ptr_container or do I have > to hand roll my own. > if yes what inserter should i use or how would i use two containers > having pointer of int > ptr_vector<int> a1; > ptr_vector<int> a2; > > have a1 union a2 and store in a3.

Should be possible, but you need a different out-put iterator compared to e.g. std::back_inserter( a_normal_container ).

Specifically, you need to call a3's clone_allocators' allocate_clone() in the call to push_back().

-Thorsten _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org mailto:Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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chun ping wang

29 Nov 29 Nov

1:09 a.m.

hmm yeah i want to be able to store them in ptr_vector<int> a3. Since this doesn't work.. you think their would be future work around to support integeration with stl algorithms. On Nov 28, 2007 2:44 PM, Thorsten Ottosen wrote:

chun ping wang skrev:

...
hmm can you give a small example of what you mean.. calling clone_allocators' allocate clone

Calling new_clone() is probably sufficient for most purposes.

-Thorsten

...
On Nov 28, 2007 5:38 AM, Thorsten Ottosen mailto:thorsten.ottosen@dezide.com> wrote:

chun ping wang skrev: > is it possible to use stl set_unions with ptr_container or do I have > to hand roll my own. > if yes what inserter should i use or how would i use two containers > having pointer of int > ptr_vector<int> a1; > ptr_vector<int> a2; > > have a1 union a2 and store in a3.

Should be possible, but you need a different out-put iterator compared to e.g. std::back_inserter( a_normal_container ).

Specifically, you need to call a3's clone_allocators' allocate_clone() in the call to push_back().

-Thorsten _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org mailto:Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Thorsten Ottosen

8:51 a.m.

chun ping wang skrev:

hmm yeah i want to be able to store them in ptr_vector<int> a3.

Since this doesn't work.. you think their would be future work around to support integeration with stl algorithms.

If you were to implement output iterators for ptr_containers, I would be happy to include it. The planned void* -> T* implementation will also make it easier to use some stl algorithms. But notice most algorithms use Copyability, something not usually supported by polymorphic types. -Thorsten

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Jeff Flinn

1:34 p.m.

chun ping wang wrote:

hmm yeah i want to be able to store them in ptr_vector<int> a3.

I'm curious as to why one would ever want a ptr_vector of int's? Or is this just used in this example? Jeff Flinn

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chun ping wang
Jeff Flinn
Thorsten Ottosen