Re: How do I assign attributes of a function to another function?
On Friday, 5 November 2021 at 06:19:16 UTC, Li30U wrote:
...e.g.
```d
// ...
mixin ("ReturnType /*...snip...*/ " ~ member ~ "()(Parameters!
/*...snip...*/
```
Note the `()` before parameter list. This would make your member
function a function template, for which attributes will be
inferred by the compiler based on the calls you make in the
function body.
Of course, making it a template like this makes it non-composable
with that same type as you're only inspecting functions, so you
wouldn't be able to do e.g. a Group!(Group!(A, 3), 4);
Re: How do I assign attributes of a function to another function?
On Friday, 5 November 2021 at 06:19:16 UTC, Li30U wrote: I am creating a templated object that is a storehouse for a heap object and executes their methods and returns an array of results. With the help of a template, I want to achieve this, but I want to assign the same attributes to the function. How can one pass the attributes of a function to another function? There's https://dlang.org/spec/traits.html#getFunctionAttributes . Or you could define your functions as function templates, letting the compiler infer attributes. Especially as it looks like you function's attributes may not be made the same as the ones you defer to: since you're allocating with the GC, your function cannot be @nogc even if a deferred one can.
How do I assign attributes of a function to another function?
I am creating a templated object that is a storehouse for a heap
object and executes their methods and returns an array of
results. With the help of a template, I want to achieve this, but
I want to assign the same attributes to the function. How can one
pass the attributes of a function to another function?
```d
template Group(T, int objects)
{
struct Group
{
enum __length = __traits(allMembers, T).length;
T[objects] __objects;
this(T[objects] __objctor) @safe
{
__objects = __objctor;
}
static foreach (member; __traits(allMembers, T))
{
static if ( __traits(getVisibility,
__traits(getMember, T, member)) != "private" &&
__traits(getVisibility,
__traits(getMember, T, member)) != "protected")
{
static if (isFunction!(__traits(getMember, T,
member)))
{
mixin ("ReturnType!(__traits(getMember, T,
member))[] " ~ member ~ "(Parameters!(__traits(getMember, T,
member)) args)
{
ReturnType!(__traits(getMember, T,
member))[] results;
foreach (e; __objects)
results ~= e." ~ member ~ "(args);
return results;
}");
}else
static if (member != "Monitor")
{
mixin ("typeof(__traits(getMember, T,
member))[] " ~ member ~ "()
{
typeof(__traits(getMember, T, member))[]
results;
foreach (e; __objects)
results ~= e." ~ member ~ ";
return results;
}");
}
}
}
}
}
```
