Window.h

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/*
 *  Copyright (c) 2015-present, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */
#pragma once

#include <cstdint>

namespace proxygen {

class Window {
 public:
  explicit Window(uint32_t capacity);

  int32_t getSize() const;

  uint32_t getNonNegativeSize() const;

  uint32_t getCapacity() const;

  uint32_t getOutstanding() const;

  bool reserve(uint32_t amount, bool strict = true);

  bool free(uint32_t amount);

  bool setCapacity(uint32_t capacity);

 private:
  int32_t outstanding_{0};
  int32_t capacity_{0};  // always positive
};

}