www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - Taming templates and mixin magic: type inpector helper in D/Phobos?

reply Carlos Navarro <carlos.ns gmail.com> writes:
As a newbie in D (and making a lots of mistakes), I've found 
myself relying heavily in the use of a rudimentary type inspector 
to visualize my templated code instantiations.
It's simple and incomplete as hell but good enough to see what 
happens under the hood quickly.

QUESTION: Is there a function like that already in D?


//real-life example
goodEnoughTypeInspector!Human;
goodEnoughTypeInspector!(Database!Human);

//compile-time output
Inspecting type: Human
          - public string name
          - public string address
          - public bool active

Inspecting type: Database!(Human)
          - private string[] name
          - private string[] address
          - private bool[] active
          - public pure nothrow  nogc  safe ulong() count
          - public void insert
Apr 03 2018
parent Uknown <sireeshkodali1 gmail.com> writes:
On Wednesday, 4 April 2018 at 05:28:57 UTC, Carlos Navarro wrote:

 As a newbie in D (and making a lots of mistakes), I've found 
 myself relying heavily in the use of a rudimentary type 
 inspector to visualize my templated code instantiations.
 It's simple and incomplete as hell but good enough to see what 
 happens under the hood quickly.

 QUESTION: Is there a function like that already in D?


 //real-life example
 goodEnoughTypeInspector!Human;
 goodEnoughTypeInspector!(Database!Human);

 //compile-time output
 Inspecting type: Human
          - public string name
          - public string address
          - public bool active

 Inspecting type: Database!(Human)
          - private string[] name
          - private string[] address
          - private bool[] active
          - public pure nothrow  nogc  safe ulong() count
          - public void insert


you might want to check std.traits [0] and __traits [1]. They 
both contain functions that may be useful. To get members you 
could use
__traits(allMembers, MyTemplate!SomeType);

Just check through the docs for relevant functions. You can then 
compose the relevant function. I wrote a basic version you can 
play with [2].


[0]: https://dlang.org/phobos/std_traits.html
[1]: https://dlang.org/spec/traits.html
[2]: https://run.dlang.io/is/COZ89T
Apr 04 2018