Re: [boost] is_nan

From: Howard Hinnant (hinnant_at_[hidden])
Date: 2006-07-26 10:13:41

On Jul 26, 2006, at 4:55 AM, John Maddock wrote:

> Won't bool isnormal(const Person&) be the better overload and  
> therefore the
> one called?  The worst I can see happening is an "ambiguous  
> overload" error.

Fwiw, here's a standalone test.  But at this point it's academic as I  
didn't know about boost::math which I think is probably sufficient  
protection.

#include <iostream>

namespace boost
{

template <class T>
bool
isnormal(T t) {std::cout << "boost::isnormal\n"; return true;}

template<class T>
class optional {};

}

namespace Mine
{

struct sense_of_humor {};

struct Person : private boost::optional<sense_of_humor> {};

struct Female : public Person {};

bool isnormal(const Person&) {std::cout << "Mine::isnormal\n"; return  
false;}

bool foo()
{
     Female Jane;
     return isnormal(Jane);
}

}

int main()
{
     Mine::foo();
}

This prints out "boost::isnormal" for me.

-Howard