bind.hpp

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#ifndef IROHA_COMMON_BIND_HPP
#define IROHA_COMMON_BIND_HPP

#include <ciso646>
#include <type_traits>
#include <utility>

namespace iroha {

  template <typename T, typename Transform>
  auto operator|(T &&t, Transform &&f) -> std::enable_if_t<
      not std::is_same<
          decltype(std::forward<Transform>(f)(*std::forward<T>(t))),
          void>::value,
      decltype(std::forward<Transform>(f)(*std::forward<T>(t)))> {
    if (std::forward<T>(t)) {
      return std::forward<Transform>(f)(*std::forward<T>(t));
    }
    return {};
  }

  template <typename T, typename Transform>
  auto operator|(T &&t, Transform &&f) -> std::enable_if_t<
      std::is_same<decltype(std::forward<Transform>(f)(*std::forward<T>(t))),
                   void>::value> {
    if (std::forward<T>(t)) {
      std::forward<Transform>(f)(*std::forward<T>(t));
    }
  }
}  // namespace iroha

#endif  // IROHA_COMMON_BIND_HPP