Re: Find struct not passed by reference

[Ali Çehreli via Digitalmars-d-learn]

On 8/2/21 4:06 PM, frame wrote:
Is there a way to find a struct which should be passed by reference but 
accidentally isn't? Maybe with copy constructors?

If I understand it correctly, your current value-type needs to be a 
reference type. Would the following be workable solutions?

a) Classes are already reference types. So, replace struct with class:

class Foo {
  // ...
}


b) Make your struct a reference type by

i) Renaming it

struct FooImplementation {
  // ...
}

ii) Using a wrapper with the old name

struct Foo {
  FooImplementation * impl;

  this(int i) {
    this.impl = new FooImplementation(i);
  }

  // ...
}

But the problem with the 'b' option is, all objects are being allocated 
dynamically with that constructor. Then, there can be a ref-taking 
constructor (as well):

struct Foo {
  // ...

  this(ref FooImplementation impl) {
    this.impl = &impl;
  }
}

Finally, an 'alias this' can make the transition easy in the 'b' case.

Ali