C++ Design Patterns
design-pattern
cpp
observer-pattern
object-oriented
visitor-pattern
strategy-pattern
abstract-factory-pattern
singleton-pattern
decorator-pattern
behavioral-patterns
creational-patterns
structural-patterns
factory-method-pattern
iterator-pattern
template-method-pattern
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Updated
Oct 1, 2020 - C++
It is common to have
Uniontraits of the formUnion(None, <something>). As a convenience to developers, and following a similar convention in Python'stypingmodule, we should consider havingOptional(<something>)as an alternative way of writingUnion(None, <something>).An alternative would be to make
allow_nonemetadata universally accepted acrossTraitTypeinstances.