Re: opIndex for type list
On Monday, 24 August 2020 at 14:19:14 UTC, data pulverizer wrote:
Hi all,
I am trying to implement `opIndex` (e.g. T[i]) for types in a
struct. So for I have `length`:
```d
struct TList(T...)
{
enum long length = T.length;
}
```
and have tried including
```d
alias opIndex(long i) = T[i];
```
or
```d
alias opIndex(alias i) = T[i];
```
called with
```d
alias tList = AliasSeq!(bool, string, ubyte, short, ushort);
TList!(tList)[0];
```
but that doesn't work and I get the error:
```d
opIndex cannot deduce function from argument types !()(int),
candidates are:
opIndex(long i)
```
This is an interesting syntax, and it reminds me of Python's
generic syntax. Will be interested to see how you use type
opIndex.
Re: opIndex for type list
On Monday, 24 August 2020 at 14:36:22 UTC, Adam D. Ruppe wrote: On Monday, 24 August 2020 at 14:19:14 UTC, data pulverizer wrote: I am trying to implement `opIndex` (e.g. T[i]) for types in a struct. So for I have `length`: Can't really do that, the operator overloads work on instances instead of static types. AliasSeq is magical because it just gives a name to something built-into the compiler. Fair enough, it's not a show stopper.
Re: opIndex for type list
On Monday, 24 August 2020 at 14:19:14 UTC, data pulverizer wrote: I am trying to implement `opIndex` (e.g. T[i]) for types in a struct. So for I have `length`: Can't really do that, the operator overloads work on instances instead of static types. AliasSeq is magical because it just gives a name to something built-into the compiler.
Re: opIndex for type list
On Monday, 24 August 2020 at 14:19:14 UTC, data pulverizer wrote: I am trying to implement `opIndex` (e.g. T[i]) for types in a struct. p.s. I know I could just write a separate `get` template, but `AliasSeq` has opIndex and opSlice operators, so I wonder whether it is possible to get those in this case.
opIndex for type list
Hi all,
I am trying to implement `opIndex` (e.g. T[i]) for types in a
struct. So for I have `length`:
```d
struct TList(T...)
{
enum long length = T.length;
}
```
and have tried including
```d
alias opIndex(long i) = T[i];
```
or
```d
alias opIndex(alias i) = T[i];
```
called with
```d
alias tList = AliasSeq!(bool, string, ubyte, short, ushort);
TList!(tList)[0];
```
but that doesn't work and I get the error:
```d
opIndex cannot deduce function from argument types !()(int),
candidates are:
opIndex(long i)
```
