Implicit constructor call

[Chris Nicholson-Sauls]

LeoD wrote:
> Hi,
> can constructors be called implicit in D? Example:
> 
> class Foo
> {
> 	this(int i)
> 	{
> 
> 	}
> }
> 
> void test(Foo f)
> {
> 
> }
> 
> int main()
> {
> 	test(100); // Here Foo.this(100); should get called
> 
> 	return 0;
> }

You can get this using typesafe variadic arguments:
# class Foo {
#   this (int i) { }
# }
#
# void test (Foo f ...) { }
#
# int main () {
#   test(100);
#   return 0;
# }

See: http://digitalmars.com/d/function.html
Heading: Variadic Functions
Subheading: Typesafe Variadic Functions

> 
> And why are there no templated constructors in D? Example:
> 
> this(T)(T parameter)
> {
> 
> }

Because constructors are not virtual... or at least that's the explanation given in 
compiler errors with this.  Seems more like just a special case.  I was actually a little 
bit disappointed myself, though the use cases seem to be pretty niche.

-- Chris Nicholson-Sauls