Re: [Boost-users] [ptr_container] Transferring the Last Element from a ptr_vector

Subject: Re: [Boost-users] [ptr_container] Transferring the Last Element from a ptr_vector
From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2009-09-07 03:13:14

Charles Brockman skrev:
> I have two functions which swap elements between ptr_vectors. The first 
> compiles and apparently works correctly.
> 
> typedef boost::ptr_vector<Gene> GeneVectType;
> GeneVectType geneVect;
> 
> void Gene::swapGene(Gene* other) {
>   geneVect.transfer(geneVect.end(), other->geneVect.begin(), 
> other->geneVect);
>   other->geneVect.transfer(other->geneVect.end(), geneVect.begin(), 
> geneVect);
> }
> 
> Occasionally I must reverse the swap with this unswap function.
> 
> void Gene::unswapGene(Gene* other) {
>   // The line below is line 560 referred to in the error message.
>   geneVect.transfer(geneVect.begin(), other->geneVect.rbegin(), 
> other->geneVect);
>   other->geneVect.transfer(other->geneVect.begin(), geneVect.rbegin(), 
> geneVect);
> }

You can't use reverse iterators in transfer.

HTH

-Thorsten