obj_utils.hpp

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#ifndef IROHA_COMMON_OBJ_UTILS_HPP
#define IROHA_COMMON_OBJ_UTILS_HPP

#include <boost/optional.hpp>

namespace iroha {

  template <typename C>
  auto makeOptionalGet(C map) {
    return [&map](auto key) -> boost::optional<typename C::mapped_type> {
      auto it = map.find(key);
      if (it != std::end(map)) {
        return it->second;
      }
      return boost::none;
    };
  }

  template <typename T, typename... Args>
  auto makeMethodInvoke(T &object, Args &&... args) {
    return [&](auto f) { return (object.*f)(std::forward<Args>(args)...); };
  }

  template <typename V, typename B>
  auto assignObjectField(B object, V B::*member) {
    return [=](auto value) mutable {
      object.*member = value;
      return boost::make_optional(object);
    };
  }

  template <template <typename C> class P, typename V, typename B>
  auto assignObjectField(P<B> object, V B::*member) {
    return [=](auto value) mutable {
      (*object).*member = value;
      return boost::make_optional(object);
    };
  }
}  // namespace iroha

#endif  // IROHA_COMMON_OBJ_UTILS_HPP