c++ - Avoiding getting a substring? -

I have a situation where I have the std :: string, and only the letters for x from x + y It is necessary, and I think it will make it very fast if I can (x *) and string [x] in any way instead, but the problem is that all my actions are expected to have an unused ending string.

What can I do?

Thanks

nothing can be done well I can think that The only move is temporarily setting 0, pass and [x] to s [x + y + 1] , then restore the character, but only its gain It should be done only if you are sure that it will increase the performance appropriately and it is necessary to promote








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