High scalable application characteristics

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1. Stateless
- HTTP request/respond structure.
2. Idempotence
- database snapshot, recovering data.
3. Monoid
- map/reduce, parallelizing operations.

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C++ - Class template argument deduction guide

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A deduction guide tells the compiler how to deduce template arguments when you construct an object without explicitly specifying them.

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Immediately Invoked Lambda Expression technique on initialize the singleton