Merge "Add macros to check for successful Result"

template <typename T>

using Result = android::base::expected<T, ResultError>;

// Macros for testing the results of functions that return android::base::Result.

// These also work with base::android::expected.

#define CHECK_RESULT_OK(stmt)       \

  do {                              \

    const auto& tmp = (stmt);       \

    CHECK(tmp.ok()) << tmp.error(); \

  } while (0)

#define ASSERT_RESULT_OK(stmt)            \

  do {                                    \

    const auto& tmp = (stmt);             \

    ASSERT_TRUE(tmp.ok()) << tmp.error(); \

  } while (0)

#define EXPECT_RESULT_OK(stmt)            \

  do {                                    \

    auto tmp = (stmt);                    \

    EXPECT_TRUE(tmp.ok()) << tmp.error(); \

  } while (0)

// TODO: Maybe add RETURN_IF_ERROR() and ASSIGN_OR_RETURN()

}  // namespace base

}  // namespace android