utils.h

#ifndef REG_UTILS_H
#define REG_UTILS_H
#include <codecvt>

#include <locale>

#include <unordered_set>

#include <functional>

namespace reg {


template<class C,class T> size_t index_of(C const& container, T const& element) {
  static_assert(std::is_same<typename C::value_type,T>::value, "C must be a container with T as value_type.");
  return static_cast<size_t>(std::distance(container.begin(), std::find(container.begin(), container.end(), element)));
}

extern std::wstring_convert<std::codecvt_utf8<char32_t>,char32_t> converter; 
} // namespace reg
#endif