Programming-Idioms

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2019-09-29, 08:54:51

2020-05-21, 22:06:27

Idiom #73 Create a factory

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

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

fact,str

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

auto fact(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.

https://dpaste.dzfl.pl/221d6b58bdc6

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