Programming in D page 295 - disable default constructor

[Brother Bill]

On Tuesday, 10 February 2026 at 12:50:16 UTC, monkyyy wrote:
> On Tuesday, 10 February 2026 at 12:04:05 UTC, Brother Bill 
> wrote:
>> When adding an explicit constructor such as ```this(string 
>> fileName)```, this is "supposed" to remove the "default" 
>> constructor.  Then the developer needs to add back the default 
>> constructor.
>>
>> [...]
>
> ```d
> import std;
> struct foo{
> 	int i,j;
> 	this(int a, int b){
> 		j=a;
> 		i=b;
> 	}
> }
> unittest{
> 	auto bar=foo(1,2);
> 	bar=foo(3);
> }
> ```
>


>> Error: constructor `onlineapp.foo.this(int a, int b)` is not 
>> callable using argument types `(int)`
>
> working as expected

Perfectly true as foo(3) has no explicit constructor.
If you remove this(int a, int b), it will also fail to compile.

My question is about the *parameterless* constructor:
``` auto a4 = Archive();```

I am unable to define a parameterless constructor for it.
Is the only alternative to prevent a parameterless construction 
to use ```@disable this();``` ?