[boost] [Range] Confusing result of iterator_range::size()

Subject: [boost] [Range] Confusing result of iterator_range::size()
From: Sergey Voropaev (serge-voropaev_at_[hidden])
Date: 2011-11-03 02:42:09

Hi,
I try use boost::iterator_range as replacement for some standard container in my
code. The function  iterator_range::size() has non standart declaration:

difference_type size() const;
but not:
size_type size() const

When I compile code in VC++ 2010 I have a some warning and error. For example:

#include <boost/range.hpp>
#include <vector>
#include <algorithm> 

int main()
{
        int aaa[10] ={1,2,3,4,5,6,7,8,9,10};
        std::vector<int> bbb(20);

        boost::iterator_range<int*> arr(aaa);
        if(bbb.size() > arr.size())	//warning C4018: '>' : signed/unsigned mismatch
        {
        }

        const size_t lng = std::min(bbb.size(), arr.size());
        //error C2780: 'const _Ty &std::min(const _Ty &,const _Ty &,_Pr)' : expects 3
arguments - 2 provided
        //error C2782: 'const _Ty &std::min(const _Ty &,const _Ty &)' : template
parameter '_Ty' is ambiguous
//	const size_t lng = std::min(bbb.size(), (size_t)arr.size());	//OK

        for(size_t i = 0; i < lng; ++i)
        {
                bbb[i] = arr[i]; 
        }
        return 0;
}

I think declaration of boost::iterator_range must be fixed. Or there was some
reason for this non standard declaration?