Re: rval->ref const(T), implicit conversions

[tsbockman via Digitalmars-d]

On Monday, 18 January 2016 at 15:36:09 UTC, Manu wrote:
One more time...
Assuming:
void func(const CustomString &s1, const CustomString &s2);
void func(ref const(CustomString) s1, ref const(CustomString) 
s2);

C++:
  func("hello", "world");

D:
  auto dumb_name = CustomString("hello");
  auto another_dumb_name = CustomString("world");
  func(dumb_name, another_dumb_name);

Actually, I was way overthinking things. Does *this* do what you 
want?

import std.stdio;

struct CustomString {
    this(string data) {
        this.data = data;
    }

    string data;
    alias data this;
}

void func(ref CustomString s1, ref CustomString s2) {
    writeln(s1);
    writeln(s2);
    s2 = "universe!";
}

pragma(inline, true)
void arFunc(T, V)(auto ref T s1, auto ref V s2) {
    func(s1, s2);
}

void main() {
    CustomString b = CustomString("world!");
    arFunc(CustomString("Hello"), b);

    writeln("Hello");
    writeln(b);
}

Again, I can probably automate generation of the wrapper easily 
enough.