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digitalmars.D - overloading by constness

reply downs <default_357-line yahoo.de> writes:
This is the one major thing that stops me from switching to D 2.0, and so I
have to ask:
Are there any plans to allow us to overload D functions by the constness of
their parameters? In a 
related question: Will constness ever be part of the name mangling?
I realize D 2.0 is still alpha (although one wouldn't suspect that from the way
the D homepage 
looks), so I don't expect it immediately, but some estimate would be nice. I
have some code that 
depends on this.
  --downs
Jul 24 2007
parent reply Christian Kamm <kamm.incasoftware shift-at-left-and-remove-this.de> writes:
 This is the one major thing that stops me from switching to D 2.0, and so
 I have to ask: Are there any plans to allow us to overload D functions by
 the constness of their parameters?



Is this what you mean? Since const() and invariant() construct new types,
overloading should work just fine.

----
void foo(char[] str)
{ writefln("plain"); }

void foo(const(char[]) str)
{ writefln("const"); }

void main()
{
  char[] plainstr = "abc".dup;
  const(char[]) conststr = "abc";
        
  foo(plainstr); // prints plain
  foo(conststr); // prints const
}
----

Christian
Jul 24 2007
parent downs <default_357-line yahoo.de> writes:
Christian Kamm wrote:

This is the one major thing that stops me from switching to D 2.0, and so
I have to ask: Are there any plans to allow us to overload D functions by
the constness of their parameters?



 
 Is this what you mean? Since const() and invariant() construct new types,
 overloading should work just fine.
 
 ----
 void foo(char[] str)
 { writefln("plain"); }
 
 void foo(const(char[]) str)
 { writefln("const"); }
 
 void main()
 {
   char[] plainstr = "abc".dup;
   const(char[]) conststr = "abc";
         
   foo(plainstr); // prints plain
   foo(conststr); // prints const
 }
 ----
 
 Christian



Thanks for answering.
  --downs
Jul 24 2007