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#include <iostream>
#include <iterator>
#include <vector>

template <typename RandIter>
bool in_range_impl(RandIter test, RandIter r_begin, RandIter r_end, std::random_access_iterator_tag) {
  return test >= r_begin && test < r_end;
}
 
template <typename Iter>
bool in_range(Iter test, Iter r_begin, Iter r_end) {
  typename std::iterator_traits<Iter>::iterator_category Catcat;
  return in_range_impl(test, r_begin, r_end, Catcat);
}
 
void f() {
  std::vector<double> foo(10);
  std::vector<double> bar(1);
  std::cout << std::boolalpha << in_range(bar.begin(), foo.begin(), foo.end());
}

#include <iostream>
 
template <typename Ty>
bool in_range(const Ty *test, const Ty *r, size_t n) {
  auto *cur = reinterpret_cast<const unsigned char *>(r);
  auto *end = reinterpret_cast<const unsigned char *>(r + n);
  auto *test_ptrtestPtr = reinterpret_cast<const unsigned char *>(test);
 
  for (; cur != end; ++cur) {
    if (cur == test_ptrtestPtr) {
      return true;
    }
  }
  return false;
}
 
void f() {
  double foo[10];
  double *x = &foo[0];
  double bar;
  std::cout << std::boolalpha << in_range(&bar, x, 10);
}