exception_or.h

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// Copyright 2018 Google LLC
//
// 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
//
//     https://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.

#ifndef SHAKA_EMBEDDED_MAPPING_EXCEPTION_OR_H_
#define SHAKA_EMBEDDED_MAPPING_EXCEPTION_OR_H_

#include <utility>

#include "shaka/variant.h"
#include "src/js/js_error.h"

namespace shaka {

#define RETURN_IF_ERROR(code)                 \
  do {                                        \
    ExceptionOr<void> except = (code);        \
    if (holds_alternative<JsError>(except))   \
      return get<JsError>(std::move(except)); \
  } while (false)

template <typename T>
struct ExceptionOr final : variant<js::JsError, T> {
  using variant<js::JsError, T>::variant;
};

template <>
struct ExceptionOr<void> final : variant<js::JsError, monostate> {
  using variant<js::JsError, monostate>::variant;
  ExceptionOr() : variant(monostate()) {}
};

}  // namespace shaka

#endif  // SHAKA_EMBEDDED_MAPPING_EXCEPTION_OR_H_