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// Copyright 2013 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_SYSTEM_SYS_INFO_INTERNAL_H_
#define BASE_SYSTEM_SYS_INFO_INTERNAL_H_
#include "base/base_export.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace base {
namespace internal {
template <typename T, T (*F)(void)>
class LazySysInfoValue {
public:
LazySysInfoValue() : value_(F()) {}
LazySysInfoValue(const LazySysInfoValue&) = delete;
LazySysInfoValue& operator=(const LazySysInfoValue&) = delete;
~LazySysInfoValue() = default;
T value() { return value_; }
private:
const T value_;
};
// Exposed for testing.
BASE_EXPORT absl::optional<int> NumberOfPhysicalProcessors();
BASE_EXPORT int NumberOfProcessors();
} // namespace internal
} // namespace base
#endif // BASE_SYSTEM_SYS_INFO_INTERNAL_H_
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