What is "placement new" and why would I use it?, C++ FAQ

C++ FAQ

From Marshall Cline: Bjarne Stroustrup, Herb Sutter, Andrei Alexandrescu, Pearson / Addison-Wesley Publishers and I collaborated to create a new C++ Super-FAQ! It's a team effort, with huge contributions from each of us and with amazing support from dozens of brilliant editors. The result is "awesomer" than ever! I originally wrote/published the FAQ in 1991 and now look forward to this new phase - and to continue working with it for another 20 years!

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FAQ: What is "placement `new`" and why would I use it? ←(in the new Super-FAQ)

It's in Section: Destructors:

FAQ: What's the deal with destructors?
FAQ: What's the order that local objects are destructed?
FAQ: What's the order that objects in an array are destructed?
FAQ: Can I overload the destructor for my class?
FAQ: Should I explicitly call a destructor on a local variable?
FAQ: Can I call a destructor on a local if I really want to?
FAQ: How do I handle the situation from the previous FAQ?
FAQ: What if I can't wrap the local in an artificial block?
FAQ: Explicitly calling dtor for objects allocated with new?
FAQ: What is "placement new" and why would I use it? (this FAQ)
FAQ: Should a dtor call the dtors for member objects?
FAQ: Should a dtor call the dtors for the base class subobject?
FAQ: Should my destructor throw an exception when it detects a problem?
FAQ: Getting new to allocate memory from a specific memory area?