在C++中调用Ruby代码

#include < ruby.h > static int id_sum; int Values[] = {5, 10 ,15,-1,20,0}; static VALUE wrap_sum(VALUE args) {  VALUE * values = (VALUE *) args;  VALUE summer = values[0];  VALUE max = values[1];  return rb_funcall(summer,id_sum,1,max); }

static VALUE protected_sum(VALUE summer, VALUE max) {  int error;  VALUE args[2];  VALUE result;

 args[0] = summer;  args[1] = max;

 result = rb_protect(wrap_sum,(VALUE)args, &error);

 return error ? Qnil:result; }   int main() {  int value;  int *next = Values;

 ruby_init();  ruby_init_loadpath();  ruby_script("embedded");  rb_require("sum.rb");

 VALUE summer = rb_class_new_instance(0,0,   rb_const_get(rb_cObject,rb_intern("Summer")));

 id_sum = rb_intern("sum");

 while (value = *next++)  {   VALUE result = protected_sum(summer,INT2NUM(value));   if (NIL_P(result))   {    printf("Sum to %d doesn't compute!/n",value);   }   else    printf("Sum to %d is %d/n",value,NUM2INT(result));  }

 ruby_finalize();

 exit(0); }