How to use default in C++ to clarify the default semantics

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C.80: if you explicitly want to use the default semantics, use = default

Reason (reason)

The compiler is more likely to handle the semantics of the default function correctly, and you can't do better than the compiler.

Example (sample) class Tracer {

String message

Public:

Tracer (const string& m): message {m} {cerr ~ Tracer () {cerr