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#pragma once
#include <cmath>
#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);
* double norm_squared(F_t x);
* void write_magnetization(M_t M, FILE *outfile);
*
*/
class ising_t {
public:
bool x;
typedef int M_t;
typedef double F_t;
};
void init(ising_t *p) {
p->x = false;
}
void free_spin(ising_t s) {
// do nothing!
}
void free_spin(int s) {
// do nothing
}
void free_spin(double s) {
// do nothing
}
ising_t copy(ising_t s) {
return s;
}
void add(int *s1, int a, ising_t s2) {
if (s2.x) {
*s1 -= a;
} else {
*s1 += a;
}
}
void add(double *s1, double a, ising_t s2) {
if (s2.x) {
*s1 -= a;
} else {
*s1 += a;
}
}
int scalar_multiple(int factor, ising_t s) {
if (s.x) {
return -factor;
} else {
return factor;
}
}
double norm_squared(double s) {
return pow(s, 2);
}
void write_magnetization(int M, FILE *outfile) {
fwrite(&M, sizeof(int), 1, outfile);
}
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