how to use a class with constructor arguments

my class, which is compatible with the ITransformer interface from the README

class PlusNumber {
  private int number;
  this(int number) {
    this.number = number;
  }

  int transform(int i) pure const {
    return i + number;
  }
}

when instancing

auto plus = Transformer(new PlusNumber(42));

I get the following compile error

dlang/dmd-2.094.2/linux/bin64/../../src/phobos/std/conv.d(4706,9): Error: static assert:  "Don't know how to initialize an object of type PlusNumber with arguments ()"
dlang/dmd-2.094.2/linux/bin64/../../src/phobos/std/conv.d(4785,21):        instantiated from here: `emplace!(PlusNumber)`
dlang/dmd-2.094.2/linux/bin64/../../src/phobos/std/experimental/allocator/package.d(1174,56):        instantiated from here: `emplace!(PlusNumber)`
.dub/packages/tardy-0.0.1/tardy/source/tardy/poly.d(417,33):        instantiated from here: `make!(PlusNumber, GC)`
.dub/packages/tardy-0.0.1/tardy/source/tardy/poly.d(36,39):        instantiated from here: `constructInstance!(PlusNumber, GC, PlusNumber)`
source/tardy_fun.d(77,33):        instantiated from here: `__ctor!(Polymorphic!(ITransformer, GC), PlusNumber)`

However it DOES work when I change class to struct OR if i add a copy constructor this(PlusNumber other) to the class.

Thx for your time!

atilaneves / tardy

how to use a class with constructor arguments #14