Optimize class string in stl. For example, a is a string, b is a string with value "hello". When the programmer writes "a = b", a becomes "hello" and b is still "hello", but a does not allocated memory for efficiency. Then the programmer calls "b.uppercase". b become "HELLO" while a is still "hello". That is string behaves exactly like the one from stl but allocate new memory as late as possible.

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Optimize class string in stl. For example, a is a string, b is a string with value &#034;hello&#034;. When the programmer writes &#034;a = b&#034;, a becomes &#034;hello&#034; and b is still &#034;hello&#034;, but a does not allocated memory for efficiency. Then the programmer calls &#034;b.uppercase&#034;. b become &#034;HELLO&#034; while a is still &#034;hello&#034;. That is string behaves exactly like the one from stl but allocate new memory as late as possible.

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