Method NewRandomAccessFile

src/leveldb/db/db_test.cc:206–229

  }

  Status NewRandomAccessFile(const std::string& f, RandomAccessFile** r) {
    class CountingFile : public RandomAccessFile {
     private:
      RandomAccessFile* target_;
      AtomicCounter* counter_;

     public:
      CountingFile(RandomAccessFile* target, AtomicCounter* counter)
          : target_(target), counter_(counter) {}
      ~CountingFile() override { delete target_; }
      Status Read(uint64_t offset, size_t n, Slice* result,
                  char* scratch) const override {
        counter_->Increment();
        return target_->Read(offset, n, result, scratch);
      }
      std::string GetName() const override { return ""; }
    };

    Status s = target()->NewRandomAccessFile(f, r);
    if (s.ok() && count_random_reads_) {
      *r = new CountingFile(*r, &random_read_counter_);
    }
    return s;
  }
};

class DBTest {