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43203984f7
Augment the C++ generator to emit a C++ copy constructor and a by-value copy assignment operator. This is enabled by default when the C++ standard is C++11 or later. These additional functions are only emitted for objects that need it, typically tables containing other tables. These new functions are declared in the object table type and are defined as inline functions after table declarations. When these new functions are declared, a user-defined explicitly-defaulted default constructor and move constructor are also emitted. The copy assignment operator uses the copy-and-swap idiom to provide strong exception safety, at the expense of keeping 2 full table copies in memory temporarily. fixes #5783