Re: [boost] Seminumerical algorithms, was Re: Unlimited integer: conversion to built-in int?

From: Peter Dimov (pdimov_at_[hidden])
Date: 2001-08-25 15:32:50

From: <scleary_at_[hidden]>
> Hmm.  I don't see a really good solution from either of these.  This 
> is just an explanation of the problem, as I see it: how can we 
> provide a 'traits' concept that allows the adding of user traits?

template<class Tag, class A> struct extensible_traits;

struct is_even_tag {};

template<class Int> struct extensible_traits<is_even_tag, Int>
{
    typedef bool result_type;
    static result_type f(Int i) { return i % 2 == 0; }
};

?

--
Peter Dimov
Multi Media Ltd.