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base / test / test_future_internal.h [blame]
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TEST_TEST_FUTURE_INTERNAL_H_
#define BASE_TEST_TEST_FUTURE_INTERNAL_H_
#include <tuple>
#include <type_traits>
namespace base::test::internal {
// Helper to only implement a method if the future holds one or more values.
template <typename Tuple>
concept IsNonEmptyTuple = std::tuple_size<Tuple>::value > 0;
// Helper to only implement a method if the future holds a single value.
template <typename Tuple>
concept IsSingleValuedTuple = std::tuple_size<Tuple>::value == 1;
// Helper to only implement a method if the future holds multiple values.
template <typename Tuple>
concept IsMultiValuedTuple = std::tuple_size<Tuple>::value > 1;
} // namespace base::test::internal
#endif // BASE_TEST_TEST_FUTURE_INTERNAL_H_