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#pragma once
#include <functional>
#include "types.h"
#include "graph.h"
#include "ising.h"
template <class R_t, class X_t>
class state_t {
public:
D_t D;
L_t L;
v_t nv;
v_t ne;
graph_t *g;
double T;
X_t *spins;
R_t R;
double E;
typename X_t::M_t M; // the "sum" of the spins, like the total magnetization
v_t last_cluster_size;
typename X_t::F_t *ReF;
typename X_t::F_t *ImF;
// updating fourier terms F requires many cos and sin calls, faster to do it beforehand.
double *precomputed_cos;
double *precomputed_sin;
std::function <double(X_t, X_t)> J;
std::function <double(X_t)> H;
state_t(D_t D, L_t L, double T, std::function <double(X_t, X_t)> J, std::function <double(X_t)> H) : D(D), L(L), T(T), J(J), H(H) {
graph_t *h = graph_create_square(D, L);
nv = h->nv;
ne = h->ne;
g = graph_add_ext(h);
graph_free(h);
spins = (X_t *)malloc(nv * sizeof(X_t));
for (v_t i = 0; i < nv; i++) {
init (&(spins[i]));
}
init (&R);
E = - (double)ne * J(spins[0], spins[0]) - (double)nv * H(spins[0]);
M = scalar_multiple((int)nv, spins[0]);
last_cluster_size = 0;
ReF = (typename X_t::F_t *)malloc(D * sizeof(typename X_t::F_t));
ImF = (typename X_t::F_t *)malloc(D * sizeof(typename X_t::F_t));
for (D_t i = 0; i < D; i++) {
ReF[i] = scalar_multiple(0.0, spins[0]);
ImF[i] = scalar_multiple(0.0, spins[0]);
}
precomputed_cos = (double *)malloc(L * sizeof(double));
precomputed_sin = (double *)malloc(L * sizeof(double));
for (L_t i = 0; i < L; i++) {
precomputed_cos[i] = cos(2 * M_PI * (double)i / (double)L);
precomputed_sin[i] = sin(2 * M_PI * (double)i / (double)L);
}
}
~state_t() {
graph_free(g);
for (v_t i = 0; i < nv; i++) {
free_spin(spins[i]);
}
free(spins);
free_spin(R);
free_spin(M);
for (D_t i = 0; i < D; i++) {
free_spin(ReF[i]);
free_spin(ImF[i]);
}
free(ReF);
free(ImF);
free(precomputed_sin);
free(precomputed_cos);
}
};
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