On Tuesday, 29 September 2020 at 01:46:56 UTC, Ruby The Roobster
wrote:
I thought alias could work like this with classes:
alias test = MyClass(3,"H",9.1); //Assume the constructor
parameters for MyClass are (int,string,double).
Can anybody fix this code?
`alias` lets you create a new name for an entity that already
exists somewhere in your program.
The "entity" in question can be a lot of different things--a
type, a variable, a function, a module, a template--but it must
be something that exists independently of the alias. In other
words, you cannot use `alias` to give a name to something that
does not already have one.
But wait, you might ask, if that's true, how can you alias a
lambda? It's an anonymous function; by definition, it doesn't
have a name!
alias increment = (int x) => x + 1;
The thing is...lambdas actually do have names. They're just
generated internally by the compiler. You can't actually *use*
them in your code, but they do occasionally show up in error
messages:
increment("hello");
// Error: function literal `__lambda1(int x)` is not callable
using argument types `(string)`
