• Brian (17/17) Jun 08 2018 Like:
• Steven Schveighoffer (7/30) Jun 08 2018 Not possible in D. What you are looking for is an AST macro, and D does
• =?UTF-8?Q?Ali_=c3=87ehreli?= (25/42) Jun 08 2018 If these are your classes you can use static if or version:

Brian <zoujiaqing gmail.com> writes:

Like:

class A
{
     string b;
     string c;
}

compile-time to:

class A
{
     string _b;
     string c;
}

or:

class A
{
     string c;
}

Steven Schveighoffer <schveiguy yahoo.com> writes:

On 6/8/18 2:13 PM, Brian wrote:
 Like:
 
 class A
 {
      string b;
      string c;
 }
 
 compile-time to:
 
 class A
 {
      string _b;
      string c;
 }
 
 or:
 
 class A
 {
      string c;
 }
 

Not possible in D. What you are looking for is an AST macro, and D does 
not have those.

However, you can potentially create another type that mimics everything 
that A does except for one thing using compile-time introspection. But 
you won't be able to do that with the member functions.

-Steve

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 06/08/2018 11:13 AM, Brian wrote:
 Like:

 class A
 {
      string b;
      string c;
 }

 compile-time to:

 class A
 {
      string _b;
      string c;
 }

 or:

 class A
 {
      string c;
 }

If these are your classes you can use static if or version:

version = Z;    // Can be provided as a compiler switch as well

class A
{
     version (X) {
         string b;

     } else version (Y) {
         string _b;
     }

      string c;
}

void main () {
}

Or with static if:

class A {
     static if (some_compile_time_condition) {
         string _b;

     } else static if (...) {
         // ...

     } else {
         // ...

     }
}

Ali