Re: alias Error: need 'this'
On 3/19/23 06:49, bomat wrote:
> I can live with the `static`
> solution, I guess.
If you could, you would define it 'static' anyway. :) Because you highly
likely needed a distinct 'variableWithALongName' member for each
MyStruct object, that wouldn't work.
> Shouldn't it be the exact same underlying mechanism?
I don't know the answer. Luckily, what you describe is available in
another form in the language:
ref alias2() {
return myStruct.memberWithALongName;
}
Ali
Unrelated: I find 'myObject' a more correct name for a variable because
if 'struct' is the definition of a type, 'myStruct' attempts to convey a
misleading meaning.
Re: alias Error: need 'this'
On Sunday, 19 March 2023 at 13:49:36 UTC, bomat wrote: Thanks for the suggested workaround, I can live with the `static` solution, I guess. I still don't understand why it's necessary, though. Since a `struct` is a value type and, as I understand it, stack allocated, what difference does it make to the compiler whether I alias `variableWithALongName` or `myStruct.memberWithALongName`? Shouldn't it be the exact same underlying mechanism? Thanks and regards bomat D aliases are for symbols, but what you try to alias is an expression. You might feel that what you request may work, but that's only a very particular case. Generally expressions cannot be aliased because without context they become polymorphic (or erather polysemous).
Re: alias Error: need 'this'
On Sunday, 19 March 2023 at 12:29:19 UTC, Salih Dincer wrote: It is possible to achieve the convenience you want to achieve in 2 ways. One of them is to use a static member but if not, to use an alias inside the container. Thanks for the suggested workaround, I can live with the `static` solution, I guess. I still don't understand why it's necessary, though. Since a `struct` is a value type and, as I understand it, stack allocated, what difference does it make to the compiler whether I alias `variableWithALongName` or `myStruct.memberWithALongName`? Shouldn't it be the exact same underlying mechanism? Thanks and regards bomat
Re: alias Error: need 'this'
On Sunday, 19 March 2023 at 11:52:50 UTC, bomat wrote:
It works fine with the `int` variable, but with the struct
member I get a compilation error:
```
Error: need `this` for `memberWithALongName` of type `int`
```
What is that supposed to mean?
It is possible to achieve the convenience you want to achieve in
2 ways. One of them is to use a static member but if not, to use
an alias inside the container. For example:
```d
struct MyStruct
{
int memberWithALongName;
alias ln = memberWithALongName;
static string str;
}
void main()
{
auto myStruct = MyStruct(1);
myStruct.ln = 2;
alias alias2 = MyStruct.str;
alias2 = "2";
import std.conv : text;
assert(myStruct.ln.text == alias2);
}
```
SDB@79
