String * ptr_str = static_cast(3*malloc(sizeof(String)));only Allocates the memory ;String * ptr_str2 = new String[3];calls the constructure of string class;delete[]ptr;if delete ptr only delte string[0]
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String * ptr_str = static_cast(3*malloc(sizeof(String)));only Allocates the memory ;String * ptr_str2 = new String[3];calls the constructure of string class;delete[]ptr;if delete ptr only delte string[0]
转载于:https://www.cnblogs.com/leetcode/p/3271797.html