Re: How do you peek a variant containing a complex value?

[Vinay Sajip via Digitalmars-d-learn]

On Saturday, 22 February 2020 at 18:32:06 UTC, nullptr wrote:


The type in v isn't Complex, it's Complex!double.



Ah, great. Thanks! Missed that.

Re: How do you peek a variant containing a complex value?

[nullptr via Digitalmars-d-learn]

On Saturday, 22 February 2020 at 18:00:16 UTC, Vinay Sajip wrote:
The following program won't compile if I uncomment the if 
statement:


void main()
{
Variant v = complex(1.0, 1.0);

//if (v.peek!(Complex)) {
//writeln("Complex");
//}
writeln(v);
}

I get the same error with v.peek!(complex), which is:

Error: template instance peek!(Complex) does not match template 
declaration peek(T)()


The variant can clearly hold a complex value. Someone please 
tell me - what am I doing wrong in the peek call?


The type in v isn't Complex, it's Complex!double.

This will work the way you want:
```
void main()
{
Variant v = complex(1.0, 1.0);

if (v.peek!(Complex!double))
{
writeln("Complex");
}

writeln(v);
}
```