Number of 1 Bits @LeetCode

PROBLEM :

Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight).

For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function should return 3.

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SIMPLE c++ IMPLEMENTATION :
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class Solution {
public:
    int hammingWeight(uint32_t n) {
        int count=0 ;
        while(n){
            n=n&(n-1) ;
            count++ ;
        }
        return count ;
    }
};

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