Find First Palindromic String in the Array LeetCode solution in C++

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class Solution {
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  bool isPalindrome(string str) {
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    int i = 0;
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    int j = str.length() - 1;
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    while (i <= j) {
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      if (str[i] != str[j]) return false;
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      i++;
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      j--;
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    }
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    return true;
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  }
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 public:
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  string firstPalindrome(vector<string> &words) {
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    for (int i = 0; i < words.size(); i++) {
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      if (isPalindrome(words[i])) return words[i];
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    }
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    return "";
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  }
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};