folly::IOBufHash Struct Reference

#include <IOBuf.h>

Public Member Functions
size_t	operator() (const IOBuf &buf) const noexcept
size_t	operator() (const std::unique_ptr< IOBuf > &buf) const noexcept
size_t	operator() (const IOBuf *buf) const noexcept

Detailed Description

Hasher for IOBuf objects. Hashes the entire chain using SpookyHashV2.

Definition at line 1510 of file IOBuf.h.

Member Function Documentation

size_t folly::IOBufHash::operator() ( const IOBuf &  buf ) const

noexcept

Definition at line 1090 of file IOBuf.cpp.

References b, folly::hash::SpookyHashV2::Final(), folly::hash::SpookyHashV2::Init(), folly::io::detail::CursorBase< Derived, BufType >::peekBytes(), folly::io::detail::CursorBase< Derived, BufType >::skip(), uint64_t, and folly::hash::SpookyHashV2::Update().

                                                            {
  folly::hash::SpookyHashV2 hasher;
  hasher.Init(0, 0);
  io::Cursor cursor(&buf);
  for (;;) {
    auto b = cursor.peekBytes();
    if (b.empty()) {
      break;
    }
    hasher.Update(b.data(), b.size());
    cursor.skip(b.size());
  }
  uint64_t h1;
  uint64_t h2;
  hasher.Final(&h1, &h2);
  return static_cast<std::size_t>(h1);
}

size_t folly::IOBufHash::operator() ( const std::unique_ptr< IOBuf > &  buf ) const

inlinenoexcept

Definition at line 1512 of file IOBuf.h.

                                                                    {
    return operator()(buf.get());
  }

size_t folly::IOBufHash::operator() ( const IOBuf *  buf ) const

inlinenoexcept

Definition at line 1515 of file IOBuf.h.

                                                     {
    return buf ? (*this)(*buf) : 0;
  }

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The documentation for this struct was generated from the following files:

• proxygen/folly/folly/io/IOBuf.h
• proxygen/folly/folly/io/IOBuf.cpp