Re: General rule when not to write ;
On Wed, May 19, 2021 at 05:53:12PM +, Alain De Vos via Digitalmars-d-learn
wrote:
> It seems I need }; for a function a delegate and an alias.
> ```
> double function(int) F = function double(int x) {return x/10.0;};
> double delegate(int) D = delegate double(int x) {return c*x/10.0;};
> alias myfunx=function int(int number) { return number; };
> ```
The ';' here is for terminating the alias, it is not part of the
delegate.
Basically, the grammar is this:
alias SYMBOL = DEFINITION ;
It just so happens that DEFINITION here is a function literal:
delegate ReturnType(...) { ... }
If you substitute this into the grammar, you get:
alias SYMBOL = delegate ReturnType(...) { ... } ;
That's all there is to it. This isn't rocket science.
T
--
Don't drink and derive. Alcohol and algebra don't mix.
Re: General rule when not to write ;
It seems I need }; for a function a delegate and an alias.
```
double function(int) F = function double(int x) {return x/10.0;};
double delegate(int) D = delegate double(int x) {return
c*x/10.0;};
alias myfunx=function int(int number) { return number; };
```
Re: General rule when not to write ;
On Wednesday, 19 May 2021 at 13:46:55 UTC, Jesse Phillips wrote: The ; is used to end a statement, but I don't know how to define that and distinguish it from an expression. An expression has a value. A statement doesn't. You can add a `;` at the end of an expression to make a statement from it. When you do, the value of that expression is discarded.
Re: General rule when not to write ;
On Tuesday, 18 May 2021 at 16:27:13 UTC, Alain De Vos wrote:
After each } i write a ;
And let the compiler tell me it is an empty instruction.
What are the general rules where ; is not needed after a }
This is a good question, I'm not sure I can provide a concise
answer.
In general you don't need a ; after }
The ; is used to end a statement, but I don't know how to define
that and distinguish it from an expression.
The {} create a block of code, usually they will contain
statements, so it would be common to see ; inside.
The only real time I would expect a }; is when you're defining a
lambda/delegate and assigning to a variable.
auto Foo = X;
If X is something that ends with } we will still expect a ; to
end the statement.
Re: General rule when not to write ;
On Tuesday, 18 May 2021 at 16:27:13 UTC, Alain De Vos wrote:
After each } i write a ;
And let the compiler tell me it is an empty instruction.
What are the general rules where ; is not needed after a }
Is `;` ever needed after a `}`?
I guess in `void delegate() dg = { writeln!"Hello World"; };`,
but that hardly counts, because it belongs to the variable
declaration, not the `{}`.
General rule when not to write ;
After each } i write a ; And let the compiler tell me it is an empty instruction. What are the general rules where ; is not needed after a }
