__traits() to get parameter details only ? ... hasMember looks up everything within

[someone]

On Wednesday, 4 August 2021 at 16:41:04 UTC, Alexandru Ermicioi 
wrote:

> Since you're using classes consider just declaring an interface 
> that denotes that implementor has this field, it would be much 
> easier to check for it, and easier for compiler since it avoids 
> compile time magic.

I am not sure I am following you regarding this one: you mean 
coding an interface for the sole-purpose to use traits more 
easily ? I mean, use it to unambiguously discern whether the 
required member exists since an interface won't have variables 
nor anything implementation-related which could confuse the check 
?

Like coding:

```d
private interface interfaceTickerCustom1 { ... } /// 
one-parameter granted
private interface interfaceTickerCustom2 { ... } /// 
two-parameters granted

public class classTickerCustomNYSE : interfaceTickerCustom1 {

    this(
       const dstring lstrSymbolID
       ) {

    }

}

public class classTickerCustomNASDAQ : interfaceTickerCustom2 {

    this(
       const dstring lstrSymbolID,
       const dstring lstrCurrencyID
       ) {

    }

}
```

And then checking for classTickerCustom{EchangeID} with traits 
for the existence of the interface the class is being tied to ?

Is that what you mean ?