is_any.hpp

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#ifndef IROHA_IS_ANY_HPP
#define IROHA_IS_ANY_HPP

#include <type_traits>

namespace iroha {

  template <typename T, typename... Rest>
  struct is_any : std::false_type {};

  template <typename T, typename First>
  struct is_any<T, First> : std::is_same<T, First> {};

  template <typename T, typename First, typename... Rest>
  struct is_any<T, First, Rest...>
      : std::integral_constant<bool,
                               std::is_same<T, First>::value
                                   || is_any<T, Rest...>::value> {};

}  // namespace iroha

#endif  // IROHA_IS_ANY_HPP