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If a type has some emi(trivial member) then the type (or its base
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class(es), cf. chapter ref(INHERITANCE)) does not explicitly define
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that member. Rather, it is supplied by the compiler. A trivial default
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calls the default constructors of all its class data members. A class
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having a trivial default constructor does not define any constructor
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at all (nor does/do its base class/classes). It may also define the