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tuple_twiddle_c.c - C reference version of tuple manipulation
#include <erl_nif.h>
Convert tuple of form {{1,2},3} to {3,{2,1}}. Fully decode and recode ints.
static ERL_NIF_TERM twiddle_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
int a,b,c;
const ERL_NIF_TERM *outer, *inner;
int arity;
if(!enif_get_tuple(env, argv[0], &arity, &outer)) goto error;
if(arity!=2) goto error;
if(!enif_get_tuple(env, outer[0], &arity, &inner)) goto error;
if(arity!=2) goto error;
if(!enif_get_int(env, inner[0], &a)) goto error;
if(!enif_get_int(env, inner[1], &b)) goto error;
if(!enif_get_int(env, outer[1], &c)) goto error;
return enif_make_tuple2(env,
enif_make_tuple2(env, enif_make_int(env, b), enif_make_int(env,a)));
return enif_make_badarg(env);
static ErlNifFunc nif_funcs[] = { {"twiddle", 1, twiddle_nif} };
ERL_NIF_INIT(tuple_twiddle_c, nif_funcs, NULL, NULL, NULL, NULL)