Programming-Idioms

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2015-08-21, 04:46:31

2015-08-21, 05:32:37

Idiom #73 Create a factory for a particular object class

Create a factory named pFact for any sub class of Parent and taking exactly one string str as constructor parameter.

Create a factory named pFact for any sub class of Parent and taking exactly one string str as constructor parameter.

auto pFact(T, A...)(A a)
if (is(T: Parent))
{
	return new T(a);
}

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

in D we can cover all the possible constructors using a variadic argument. Parent is checked statically with a constraint.

in D we can cover all the possible constructors using a variadic argument. Parent is checked statically with a constraint.

http://dpaste.dzfl.pl/9d4241e06f9e

http://dpaste.dzfl.pl/9d4241e06f9e

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