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#pragma once
#include <cmath>
#include <stdio.h>
#include "types.h"
/* The following is the minimum definition of a spin class.
*
* The class must contain an M_t and an F_t for holding the sum of an
* integer number of spins and a double-weighted number of spins,
* respectively.
*
* void init(X_t *p);
* void free_spin(X_t p);
* void free_spin(M_t p);
* void free_spin(F_t p);
* X_t copy(X_t x);
* void add(M_t *x1, int factor, X_t x2);
* void add(F_t *x1, double factor, X_t x2);
* M_t scalar_multiple(int factor, X_t x);
* F_t scalar_multiple(double factor, X_t x);
* double norm_squared(F_t x);
* void write_magnetization(M_t M, FILE *outfile);
*
*/
template <q_t q>
class potts_t {
public:
q_t x;
typedef int *M_t;
typedef double *F_t;
};
template <q_t q>
void init(potts_t <q> *p) {
p->x = 0;
}
template <q_t q>
void free_spin(potts_t <q> s) {
// do nothing!
}
template <q_t q>
void free_spin(typename potts_t<q>::M_t s) {
free(s);
}
template <q_t q>
void free_spin(typename potts_t<q>::F_t s) {
free(s);
}
template <q_t q>
potts_t <q> copy(potts_t <q> s) {
return s;
}
template <q_t q>
void add(typename potts_t<q>::M_t s1, int a, potts_t <q> s2) {
s1[s2.x] += a;
}
template <q_t q>
void add(typename potts_t<q>::F_t s1, double a, potts_t <q> s2) {
s1[s2.x] += a;
}
template <q_t q>
typename potts_t<q>::M_t scalar_multiple(int factor, potts_t <q> s) {
int *M = (int *)calloc(q, sizeof(int));
M[s.x] += factor;
return M;
}
template <q_t q>
typename potts_t<q>::F_t scalar_multiple(double factor, potts_t <q> s) {
int *F = (double *)calloc(q, sizeof(double));
M[s.x] += factor;
return M;
}
template <q_t q>
double norm_squared(typename potts<q>::F_t s) {
double total = 0;
for (q_t i = 0; i < q; i++) {
total += pow(s[i], 2);
}
return total * (double)q / ((double)q - 1.0);
}
template <q_t q>
void write_magnetization(typename potts_t<q>::M_t M, FILE *outfile) {
fwrite(&M, sizeof(int), q, outfile);
}
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