Annotation programming in my design code ..

[Brian via Digitalmars-d]

On Friday, 6 January 2017 at 17:48:23 UTC, Eugene Wissner wrote:
> On Friday, 6 January 2017 at 17:44:13 UTC, Brian wrote:
>> I would like to design features, how should I do?
>>
>> coding:
>>
>> class User
>> {
>> 	@GenerateProperty
>> 	int id;
>> 	
>> 	@GenerateProperty
>> 	string name;
>> }
>>
>> struct GenerateProperty
>> {
>> 	this(string propertyName)
>> 	{
>> 		propertyName = propertyName
>> 	}
>> 	
>> 	string propertyName;
>> 	
>> 	string getGenerateCode()
>> 	{
>> 		return "@property int " ~ propertyName ~ "() { return __" ~ 
>> propertyName ~ "; }\n at property int " ~ propertyName ~ "(int 
>> value) { return __" ~ propertyName ~ " = value; }";
>> 	}
>> }
>>
>> result code:
>>
>> class User
>> {
>>     @property int id() { return __id; }
>>     @property int id(int value) { return __id = value; }
>> 	
>>     @property string name() { return __name; }
>>     @property string name(int value) { return __name = value; }
>> 	
>> 	private
>> 	{
>> 		int __id;
>> 		string __name;
>> 	}
>> }
>
> Look into https://github.com/funkwerk/accessors for the 
> implementation.
> You should have a mixin which iterates through all class 
> members and generates the properties.

Can write this code to impl it?

import accessors;
import std.stdio;

class Base
{
     mixin(GenerateFieldAccessors);
}

class Person : Base
{
     @Read @Write
     private uint age_;

     @ConstRead
     private string name_;

     this(in string name, in uint age = 0)
     {
         this.name_ = name;
         this.age_ = age;
     }
}

void main()
{
     auto person = new Person("Saul Kripke");

     person.age = 57;

     writeln(person.name, ": ", person.age);
}