On Monday, 15 July 2013 at 18:56:38 UTC, Gary Willoughby wrote:
Are the two above class declarations achieving the same thing?
i.e. is the type hint of the second snippet shorthand for the
first's 'if'? If so which is preferred?
No, ":" stands for "same or implicitly convertible" while "==" is
strict "same":
T foo1(T : int)()
{
return T.init;
}
T foo2(T)()
if (is(T == int))
{
return T.init;
}
void main()
{
foo1!short();
foo2!short(); // error
}
As far as I know there are no "==" syntax for template
specialization. Usually template specialization syntax is
preferable for simple cases because it is more readable but any
complex case pretty much requires "if" constraint.
