Re: [Boost-users] Newbie to boost

8 Dec 2006


      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
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