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Alex Rivera
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It seems that allocator does the same work as “placement new” and “operator new”. and its interface is more convenient. For example: string *ps = static_cast<string *>(operator new(sizeof(string))); new (ps) string("Hello"); cout<<*ps<<endl; can be rewritten to allocator<string> as; string *ps2 = as.allocate(1); as.construct(ps2,"Hello"); cout<<*ps2<<endl; So it that means that "placement new" and "operator new" are obsolete?
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