Put any object conveniently as below:

// ...
User user;
db_->Put("Tom", user);
// or
db_->Put("Tom", user, WriteOptions());

include/leveldb/db.h

@@ -66,6 +66,12 @@ class LEVELDB_EXPORT DB {
   virtual Status Put(const WriteOptions& options, const Slice& key,
                      const Slice& value) = 0;
 
+  // Convenience wrapper
+  Status Put(const Slice& key, const Slice& value,
+             const WriteOptions& options = WriteOptions()) {
+    return Put(options, key, value);
+  };
+
   // Remove the database entry (if any) for "key".  Returns OK on
   // success, and a non-OK status on error.  It is not an error if "key"
   // did not exist in the database.

include/leveldb/slice.h

@@ -35,6 +35,10 @@ class LEVELDB_EXPORT Slice {
   // Create a slice that refers to the contents of "s"
   Slice(const std::string& s) : data_(s.data()), size_(s.size()) {}
 
+  // For any object
+  template<typename T>
+  Slice(const T& s) : data_(reinterpret_cast<const char*>(&s)), size_(sizeof(T)) {}
+
   // Create a slice that refers to s[0,strlen(s)-1]
   Slice(const char* s) : data_(s), size_(strlen(s)) {}