Creating implementation for idiom 73 : Create a factory

Idiom

# 73 Create a factory

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Create a factory named _fact for any sub class of _Parent and taking exactly one string _str as constructor parameter.

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Other implementations

auto fact(T, A...)(A a)
if (is(T==class) && is(T: Parent))
{
    return new T(a);
}

Demo

type ParentFactory func(string) Parent

var fact ParentFactory = func(str string) Parent {
	return Parent{
		name: str,
	}
}

Demo

type Parent = class
  constructor create(const str: string);
end;

type ClassOfParent = class of Parent;

function fact(ClassType: ClassOfParent; const str: string): Parent;
begin
  result := ClassType.Create(str);
end;

Demo

def fact(a_class, str_):
    if issubclass(a_class, Parent):
        return a_class(str_)

def fact(klass, str)
  klass.new(str) if klass.is_a?(Parent)
end

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