Copy Constructor

[Salih Dincer]

On Sunday, 5 June 2022 at 15:45:17 UTC, Salih Dincer wrote:
> Also, when we write to the screen with writeln(), why four 
> times copy-constructors are running?
>
> **Playground:** https://run.dlang.io/is/qHvLJe

I solved the problem by implementing the `toString()` member 
function. I also had to use a helper `writeout()` as below:

**struct Foo {**
```d
   string toString() {
      return format("%s", payload);
   }
```

**void main() {**
```d
   void writeout(T)(T text) {
     text.toString.writeln;/*
     import std.conv;
     text.to!string.writeln;//*/
   }
   writeout(three);
```
Interestingly, even using `to!string` the copy-constructor works 
extra +4 times! I think there will be performance losses if 
`write()` is used unconsciously everywhere! Although this way, it 
kisses with ctor +1 times :)

SDB at 79