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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);
*
*/
class ising_t {
public:
bool x;
typedef int M_t;
typedef double F_t;
ising_t() {
x = false;
}
ising_t(bool x) : x(x) {}
inline int operator*(v_t a) const {
if (x) {
return -(int)a;
} else {
return (int)a;
}
}
inline double operator*(double a) const {
if (x) {
return -a;
} else {
return a;
}
}
inline int operator-(const ising_t &s) const {
if (x == s.x) {
return 0;
} else {
if (x) {
return -2;
} else {
return 2;
}
}
}
};
inline int& operator+=(int& M, const ising_t &s) {
if (s.x) {
M--;
} else {
M++;
}
return M;
}
inline int& operator-=(int& M, const ising_t &s) {
if (s.x) {
M++;
} else {
M--;
}
return M;
}
double norm_squared(double s) {
return pow(s, 2);
}
void write_magnetization(int M, FILE *outfile) {
fwrite(&M, sizeof(int), 1, outfile);
}
#define N_STATES 2
const ising_t states[2] = {{(bool)0}, {(bool)1}};
q_t state_to_ind(ising_t state) { return (q_t)state.x; }
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