Re: templated constanst

From:

Carl Barron <cbarron413@adelphia.net>

Newsgroups:

comp.lang.c++.moderated

Date:

10 Jun 2006 15:48:08 -0400

Message-ID:

<100620060443535529%cbarron413@adelphia.net>

In article <1149872688.630467.262110@h76g2000cwa.googlegroups.com>,
Javier Loureiro <derethorspam@gmail.com> wrote:

how can I write this template without a static member?

-- header --

template <typename Scalar>
struct A
{
static Scalar MAX_VALUE;
};

-- explict instance --

A<float>::MAX_VALUE = FLT_MAX;
A<double>::MAX_VALUE = DBL_MAX;

using it like:

double v = Math<double>::MAX_VALUE;

It?s the only static dependency for my algebra template class...

  static member functions ok?? they can be written and not require
separate initialization.

  why not use std::numeric_limits<type> or its approach to provide
functions to provide the results as they are not compile time constants

template <class T> class A;

template <> class A<float> {static float max() {return FLT_MAX;}};
template <> class A<double> {static double max() const {return
DBL_MAX;}};
//etc.
// usage: double v = A<double>::max();

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