Re: [Boost-users] Is there such stuff in boost?

6 May 2008

      Hi Max & Ravi

Ravi wrote:
...
On Saturday 03 May 2008 09:12:01 pm Max wrote:
...
...
...
double d0, d1, d2, d3;
     boost::array array = {{d0, d1, d2, d3}};
     for(int i=0; i<4; i++) array[i] = i;
     assert(d2 == 2);
[snip]
...
If it won't take a long time, is it possible to rewrite the above code
snnipet making use of boost.Ref?
#include 
#include 
#include <cassert>
int main()
{
  typedef boost::reference_wrapper<double> double_ref_t;
  boost::array array;
double_ref_t d0( array[0] );
  double_ref_t d1( array[1] );
array[0] = 1.0;
  array[1] = 2.0;
  assert( d1 == 2.0 );
d0 += d1;
  assert( d0 == 3.0 );
}
or even:

#include <cassert>
#include 
#include 

int main()
{
    double d0, d1, d2, d3;
    boost::array array = 
{boost::ref(d0), boost::ref(d1), boost::ref(d2), boost::ref(d3)};
    for(int i=0; i<4; i++)
    {
        array[i].get() = i;
    }
    assert(d2 == 2);

    return 0;
}

although this is a slightly unusual construct which might suffer nasty 
aliasing issues, perhaps a few more details of your requirement might 
clarify a better approach.

-- 
Bill Somerville
Class Design Limited