Replace all upper case characters in the specified string having the optionally specified length with their lower‐case equivalent. The behavior is undefined unless 0 <= length (if specified) and string‐>size() <= INT_MAX (if applicable).
Replace all upper case characters in the specified string having the optionally specified length with their lower‐case equivalent. The behavior is undefined unless 0 <= length (if specified) and string‐>size() <= INT_MAX (if applicable).