Re: [boost] [rational] Inadvertent construction from double

25 Jul 2014


      2014-07-25 13:38 GMT+02:00 Andrzej Krzemienski :
...
Hi,
I have encountered something I consider a bug in boost::rational's
interface. Its documentation discusses in detail why conversion from double
is not supported, but the following code works fine:
#include <iostream>
#include 
int main()
{
  double d = 31.82;
  boost::rational<int> r = d;
  std::cout << r << std::endl;
}
With the following result:
31/1
It just discards the fractional part. Such conversion is really confusing
an I claim should be explicitly deleted.
I forgot to mention why this is working. A double is implicitly converted
to int and then the implicit constructor from int is used.