generateAssertTrap

alias BlackHole(Base) = AutoImplement!(Base, generateEmptyFunction);

interface I
{
    int foo();
    string bar();
}

auto i = new BlackHole!I();
// generateEmptyFunction returns the default value of the return type without doing anything
assert(i.foo == 0);
assert(i.bar is null);

import std.exception : assertThrown;

alias WhiteHole(Base) = AutoImplement!(Base, generateAssertTrap);

interface I
{
    int foo();
    string bar();
}

auto i = new WhiteHole!I();
// generateAssertTrap throws an exception for every unimplemented function of the interface
assertThrown!NotImplementedError(i.foo);
assertThrown!NotImplementedError(i.bar);