Re: Getting nice print of struct for debugging

[Martin Tschierschke via Digitalmars-d-learn]

On Saturday, 25 February 2017 at 01:30:09 UTC, Minty Fresh wrote:
On Saturday, 25 February 2017 at 01:27:09 UTC, Minty Fresh 
wrote:
On Wednesday, 22 February 2017 at 11:18:15 UTC, Martin 
Tschierschke wrote:
[...]

Since structs are Plain-old Data and don't do inheritance, the 
best option is a template mixin.

ie.

  template mixin PrettyPrint
  {
      string toString()
      {
          // . . .
      }
  }

From there, you can mix it into any struct you want.

  struct MyStruct
  {
      mixin PrettyPrint;
  }

If you're familiar with Rails, this is similar to a Concern.

Errata on that. Should actually be declared as:

  mixin template PrettyPrint()

This is why I shouldn't make posts from my phone.

Thank you, but this solution from Kevin Brogan, is an good 
alternative,
to add a special dump function globally, so no need to modify the 
struct definitions.

https://forum.dlang.org/post/yewavntuyutdvejwj...@forum.dlang.org

His solution:

import std.traits;

void main()
{
        WSADATA wsa;
        dump!wsa;
}

void dump(alias variable)()
{
        writeln("\nDumping ",typeid(typeof(variable)),":\n");
        writeln(variable.stringof, " = \n{");
        foreach(member; FieldNameTuple!(typeof(variable)))
        {
                writeln("\t", member, ": ", mixin("variable."~member) );
        }
        writeln("}\n");
}