Re: [Boost-users] factorial function

Subject: Re: [Boost-users] factorial function
From: John Maddock (john_at_[hidden])
Date: 2009-03-18 09:40:26

> I'm new to boost (and not so new but not very experienced to c++) and I'm
> having problems with functions defined with a template, as factorial
> (http://www.boost.org/doc/libs/1_38_0/libs/math/doc/sf_and_dist/html/math_toolkit/special/factorials/sf_factorial.html).
> My questions is, how do I call the funtion factorial? Why isn't it enough
> calling factorial(n) where n is an unsigned integer? Does one need to
> define the function specifying the result type before? If so, how?
> Thanks in advance.

You need to tell the function what you want the return type/precision to be:

boost::math::factorial<double>(10);

For example,

HTH, John.