include/spotify/json/codec/ignore.hpp

/*
 * Copyright (c) 2016 Spotify AB
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

#pragma once

#include <spotify/json/decode_context.hpp>
#include <spotify/json/detail/encode_helpers.hpp>
#include <spotify/json/detail/skip_value.hpp>
#include <spotify/json/encode_context.hpp>

namespace spotify {
namespace json {
namespace codec {

template <typename T>
class ignore_t final {
 public:
  using object_type = T;

  explicit ignore_t(object_type value = object_type())
      : _value(std::move(value)) {}

  object_type decode(decode_context &context) const {
    detail::skip_value(context);
    return _value;
  }

  void encode(encode_context &context, const object_type & /*value*/) const {
    detail::fail(context, "ignore_t codec cannot encode");
  }

  bool should_encode(const object_type & /*value*/) const {
    return false;
  }

 private:
  object_type _value;
};

template <typename T>
ignore_t<T> ignore(T value = T()) {
  return ignore_t<T>(std::move(value));
}

}  // namespace codec
}  // namespace json
}  // namespace spotify