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/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef GRPCXX_SUPPORT_SLICE_H
#define GRPCXX_SUPPORT_SLICE_H

#include <grpc++/support/config.h>
#include <grpc/slice.h>

namespace grpc {

/// A wrapper around \a grpc_slice.
///
/// A slice represents a contiguous reference counted array of bytes.
/// It is cheap to take references to a slice, and it is cheap to create a
/// slice pointing to a subset of another slice.
class Slice final {
 public:
  /// Construct an empty slice.
  Slice();
  // Destructor - drops one reference.
  ~Slice();

  enum AddRef { ADD_REF };
  /// Construct a slice from \a slice, adding a reference.
  Slice(grpc_slice slice, AddRef);

  enum StealRef { STEAL_REF };
  /// Construct a slice from \a slice, stealing a reference.
  Slice(grpc_slice slice, StealRef);

  /// Copy constructor, adds a reference.
  Slice(const Slice& other);

  /// Assignment, reference count is unchanged.
  Slice& operator=(Slice other) {
    std::swap(slice_, other.slice_);
    return *this;
  }

  /// Byte size.
  size_t size() const { return GRPC_SLICE_LENGTH(slice_); }

  /// Raw pointer to the beginning (first element) of the slice.
  const uint8_t* begin() const { return GRPC_SLICE_START_PTR(slice_); }

  /// Raw pointer to the end (one byte \em past the last element) of the slice.
  const uint8_t* end() const { return GRPC_SLICE_END_PTR(slice_); }

  /// Raw C slice. Caller needs to call grpc_slice_unref when done.
  grpc_slice c_slice() const { return grpc_slice_ref(slice_); }

 private:
  friend class ByteBuffer;

  grpc_slice slice_;
};

}  // namespace grpc

#endif  // GRPCXX_SUPPORT_SLICE_H