On Friday, 12 May 2023 at 15:00:48 UTC, Salih Dincer wrote:
```d
struct Fraction {
int num, den;
this(int n, int d)
{
num = n;
den = d;
}
// Cast Expression : convert float value of fraction
auto opCast(T : float)() const
{
return cast(float)(num) / cast(float)(den);
}
}
```
If you want auto-conversion, you should be more explicit:
```d
float opCast() { }
```
because if you return "auto" it is not the highest-prio fit and
therefore not chosen.
If you have multiple choices, you still don't need to use "auto".
Instead you can return T:
```d
T opCast(T)() if(isFloatingPoint!T)
{
return cast(T)num / cast(T)den; // float, double or real
}
```
Kind of ironic, but especially "auto" does NOT fit automatically
:-)
