meta.h

/*
 * meta.h
 *
 * This file is part of Mozzi.
 *
 * Copyright 2012-2024 Tim Barrass and the Mozzi Team
 *
 * Mozzi is licensed under the GNU Lesser General Public Licence (LGPL) Version 2.1 or later.
 *
 */
 
/*
http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Int-To-Type
Template meta-programming extras.
*/
 
#ifndef META_H_
#define META_H_
 
template <int I>
struct Int2Type
{
  enum {
    value = I      };
};
 
 
/*
//from http://en.wikibooks.org/wiki/C%2B%2B_Programming/Templates/Template_Meta-Programming#Compile-time_programming
 
//First, the general (unspecialized) template says that factorial<n>::value is given by n*factorial<n-1>::value:
template <unsigned n>
struct factorial
{
  enum { value = n * factorial<n-1>::value };
};
 
 
//Next, the specialization for zero says that factorial<0>::value evaluates to 1:
template <>
struct factorial<0>
{
  enum { value = 1 };
};
 
 
//And now some code that "calls" the factorial template at compile-time:
// Because calculations are done at compile-time, they can be
// used for things such as array sizes, eg.
//  int array[ factorial<7>::value ];
 
*/
  
#endif /* META_H_ */