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Programming-Idioms

History of Idiom 73 > diff from v308 to v309

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Version 308

2015-10-29, 13:38:24

Version 309

2015-10-29, 14:05:16

Idiom #73 htVgBtlcWttUPGOu

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Idiom #73 Create a factory

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

Code 
auto pFact(T, A...)(A a)
if (is(T==class) && is(T: Parent))
{
    return new T(a);
}
Code 
auto pFact(T, A...)(A a)
if (is(T==class) && is(T: Parent))
{
    return new T(a);
}
Comments bubble
In D we can cover all the possible constructors using a variadic argument. Parent is checked statically with a constraint.
Comments bubble
In D we can cover all the possible constructors using a variadic argument. Parent is checked statically with a constraint.
Demo URL
http://dpaste.dzfl.pl/9d4241e06f9e
Demo URL
http://dpaste.dzfl.pl/9d4241e06f9e