[bind] [multi-index] Create type of pointer to overloaded erase method
Hello all, I have a container of the following type: struct RecsByID {}; struct RecsBySizeAndFit {}; typedef boost::multi_index_container< boost::shared_ptr<LastSizeFitRecord>, bmi::indexed_by< bmi::ordered_unique<bmi::tag<RecsByID>,bmi::const_mem_fun<RecordBase,unsigned int,&RecordBase::getRecID> >, bmi::ordered_unique<bmi::tag<RecsBySizeAndFit>,bmi::const_mem_fun<LastSizeFitRecord,const SizeAndFit&,&LastSizeFitRecord::getSizeAndFit> >
RecordsContainer;
The main thing to note above is that the first index is of type "unsigned int" - the record ID. I have a container of unsigned ints which represent the records to be deleted so naturally wanted to do a std::for_each() with a binder and passing in _1 to RecordsContainer::erase. Not that simple because Records::Container::erase has three overloads so I'm trying to come up with a type that will represent the overload I want. I've tried this: RecordsContainer::size_type (RecordsContainer::*erase)(unsigned int) = &RecordsContainer::erase; but it failed to compile. Visual Studio 2003 gives me the following error on the above line: error C2440: 'initializing' : cannot convert from 'overloaded-function' to '<Unknown>' I've decided this particular pointer to member would not be intuitive to use in production code, but I thought I'd try to get it working and failed and would like to know what I'm doing wrong! Regards, Pete
AMDG Peter Barker wrote:
RecordsContainer::size_type (RecordsContainer::*erase)(unsigned int) = &RecordsContainer::erase;
but it failed to compile. Visual Studio 2003 gives me the following error on the above line: <snip>
The following compiles for me with msvc 9.0 #include <boost/shared_ptr.hpp> #include <boost/multi_index_container.hpp> #include <boost/multi_index/mem_fun.hpp> #include <boost/multi_index/ordered_index.hpp> namespace bmi = boost::multi_index; struct RecordBase { unsigned int getRecID() const { return(0); } }; struct SizeAndFit {}; struct LastSizeFitRecord : RecordBase { const SizeAndFit& getSizeAndFit() const { return(x); } SizeAndFit x; }; struct RecsByID {}; struct RecsBySizeAndFit {}; typedef boost::multi_index_container< boost::shared_ptr<LastSizeFitRecord>, bmi::indexed_by< bmi::ordered_unique<bmi::tag<RecsByID>, bmi::const_mem_fun<RecordBase,unsigned int, &RecordBase::getRecID> >, bmi::ordered_unique<bmi::tag<RecsBySizeAndFit>, bmi::const_mem_fun<LastSizeFitRecord,const SizeAndFit&, &LastSizeFitRecord::getSizeAndFit> > >
RecordsContainer;
int main() { RecordsContainer::size_type (RecordsContainer::*erase)(unsigned int) = &RecordsContainer::erase; } The parameter type is determined using call_traits, so you can see what this is for unsigned int. In Christ, Steven Watanabe
On Wed, Sep 10, 2008 at 5:54 PM, Steven Watanabe <watanabesj@gmail.com> wrote:
AMDG
Peter Barker wrote:
RecordsContainer::size_type (RecordsContainer::*erase)(unsigned int) = &RecordsContainer::erase;
but it failed to compile. Visual Studio 2003 gives me the following error on the above line: <snip>
The following compiles for me with msvc 9.0
That fails with the same error here so at least I know that's consistent. Thanks, Pete
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Peter Barker -
Steven Watanabe