Well, I still having trouble to get mem_fun working. multi_index accept boost mem_fn? Joaquin, the const still wont work. I stripped down the sample to this code: [code] #include #include #include using boost::multi_index_container; using namespace ::boost::multi_index; class Entry { private: int size; public: Entry(int s) : size(s) {} int getSize() const { return size; } }; typedef multi_index_container< Entry, indexed_by< ordered_non_unique // line 23 >

EntryCollection;

void main() { EntryCollection entries; Entry a(3); entries.insert(a); // line 33 } [/code] With getSize() const; I get this error: main.cpp:23: error: could not convert template argument `&Entry::getSize' to `int (Entry::*)()' main.cpp:24: error: template argument 1 is invalid main.cpp:25: error: template argument 1 is invalid main.cpp:25: error: template argument 2 is invalid main.cpp:25: error: ISO C++ forbids declaration of `EntryCollection' with no type main.cpp: In function `int main(int, char**)': main.cpp:33: error: `insert' has not been declared main.cpp:33: error: request for member of non-aggregate type before '(' token make.exe: *** [main.o] Error 1 On 12/7/06, "JOAQUIN LOPEZ MU?Z" wrote:

----- Mensaje original ----- De: fungos Fecha: Viernes, Diciembre 8, 2006 1:02 am Asunto: [Boost-users] Newbie to boost Para: boost-users@lists.boost.org

...

Hi, I need help to get started with boost, Im trying about some time to get a little project mine converted to use boost libs. My current project uses raw pointers and std::map. But I want to use shared_ptr and multi_index_container. [...] See the sample here: http://rafb.net/paste/results/hfHOx934.html , I have done this little sample to start understunding multi_index_container with classes using methods (mem_fun) as "selectors?". What is wrong with it?

Hello,

I can only give a cursory look to your code right now (hope to have more stable Internet access in a couple of days), but looks to me the problem with it is that the memfuns you're using for key selection must be const, i.e.

int getSize() const { return size; } etc.

HTH,

Joaquín M López Muñoz Telefónica, Investigación y Desarrollo _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

-- Animal Frontline Liberation

Nice! const_mem_fun worked in this sample. I will try to port my map to multi_index now and see how it performs. But, I dont want to give up without understund why mem_fun doesnt work. Anybody has any theory? :D Thanks Jeff. On 12/8/06, Jeff F wrote:

"fungos" wrote in message news:e763e59d0612080512k4f02b88cnee2732030a95a5ff@mail.gmail.com... Well, I still having trouble to get mem_fun working. multi_index accept boost mem_fn? Joaquin, the const still wont work. I stripped down the sample to this code:

[code]

#include #include #include

using boost::multi_index_container; using namespace ::boost::multi_index;

class Entry { private: int size; public: Entry(int s) : size(s) {} int getSize() const { return size; } };

typedef multi_index_container< Entry, indexed_by< ordered_non_unique // line 23

Doesn't this work?

ordered_non_unique< const_mem_fun > >

...

EntryCollection;

void main() { EntryCollection entries; Entry a(3); entries.insert(a); // line 33 }

Jeff Flinn

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-- Animal Frontline Liberation

Ok, so If I want to use a multi_index to manage a large collection of dynamic data, I need to be constantly updating it using the container update functions. So I need find a way to my objects known their containers so I can manage that Update inside the setters of my object. This will work? (I will try as I get at home again) On 12/8/06, Jeff F wrote:

fungos wrote:

...

...

Nice! const_mem_fun worked in this sample. I will try to port my map to multi_index now and see how it performs. But, I dont want to give up without understund why mem_fun doesnt work. Anybody has any theory? :D

IIRC, you are only allowed access to the const interface of items held by multi_index containers. Non-const methods by definition mutate the object upon which they act, which could change the item's state upon which the sort order is based. That is why you must use multi_index's update functions to modify the state of any of it's items.

Jeff Flinn

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-- Animal Frontline Liberation