common.h

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// Copyright 2020 Samsung Electronics
// TizenTV Emscripten extensions are available under two separate licenses, the
// MIT license and the University of Illinois/NCSA Open Source License.  Both
// these licenses can be found in the LICENSE file.

#ifndef INCLUDE_SAMSUNG_WASM_COMMON_H_
#define INCLUDE_SAMSUNG_WASM_COMMON_H_

#include <chrono>

#include "samsung/wasm/operation_result.h"

namespace samsung {
namespace wasm {

template <class T>
struct Result {
  T value;

  OperationResult operation_result;

  explicit operator bool() const noexcept;

  T& operator*();

  const T& operator*() const;

  T* operator->();

  const T* operator->() const;
};

template <>
struct Result<void> {
  OperationResult operation_result;

  explicit operator bool() const noexcept;
};

using Seconds = std::chrono::duration<double>;

template <class T>
Result<T>::operator bool() const noexcept {
  return static_cast<bool>(Result<void>{operation_result});
}

inline Result<void>::operator bool() const noexcept {
  return operation_result == OperationResult::kSuccess;
}

template <class T>
T& Result<T>::operator*() {
  return const_cast<T&>(static_cast<const Result<T>*>(this)->operator*());
}

template <class T>
const T& Result<T>::operator*() const {
  return value;
}

template <class T>
T* Result<T>::operator->() {
  return const_cast<T*>(static_cast<const Result<T>*>(this)->operator->());
}

template <class T>
const T* Result<T>::operator->() const {
  return &value;
}

}  // namespace wasm
}  // namespace samsung

#endif  // INCLUDE_SAMSUNG_WASM_COMMON_H_