template/mixin magic for to! auto inferring type from variable
Is there some way to do:
```D
string[3] data; //strings from some file input, some are ints,
uints, etc.
auto into!(T)(T value){return to!???(value); } // ???
uint time = into!(data[1]); // We already know this is uint
int priority = into!(data[2]);
```
instead of:
```D
uint time = to!uint(data[1]); // specifying type twice
int priority = to!int(data[2])
```
Re: import locality with function parameters
On Friday, 2 February 2024 at 01:23:11 UTC, Steven Schveighoffer wrote: Are you thinking of this? https://dlang.org/phobos/object.html#.imported -Steve Yes! Glad it's now part of D. Thank you.
Re: how can I load html files and not .dt or diet files in vibe.d
On Thursday, 1 February 2024 at 03:20:31 UTC, dunkelheit wrote:
this is my code, I'm a begginer on vibe, and I want to use html
and not diet files
`import vibe.vibe;
void main()
{
auto settings = new HTTPServerSettings;
settings.port = 8080;
settings.bindAddresses = ["::1", "127.0.0.1"];
auto listener = listenHTTP(settings, );
scope (exit)
{
listener.stopListening();
}
logInfo("Please open http://127.0.0.1:8080/ in your browser.");
runApplication();
}
void hello(HTTPServerRequest req, HTTPServerResponse res)
{
res.render!"hola.dt";
}`
I tried to load my html through iframe but it not works
!!! 5
html
body
h1 hello diet
-iframe("hola.html")
please help me :')
Explore this link https://github.com/D-Programming-GDC/gdcproject
for potential sources of inspiration.
Re: Setting field of struct object
On Monday, 22 January 2024 at 11:31:11 UTC, zjh wrote:
On Monday, 22 January 2024 at 08:54:54 UTC, zjh wrote:
```d
struct Person {
string name, email;
ulong age;
}
Person a{"n","email",33};
```
C++ can achieve ultimate `simplicity` without violating `DRY`,
And here, D violates the `DRY` principle!
Moreover, as the `package level, module level, class level,
member level`, D language violates integrity.
Because D has no `class level` limit.
These are all not `serious states`.
Apparently comments about module visibility issues are no longer
allowed on the D forum.
I wonder why your comment was not deleted though ??
No wonder there is now a fork of D.
Re: import locality with function parameters
On Friday, 2 February 2024 at 00:29:51 UTC, Carl Sturtivant wrote: Hello, I seem to recall that there is surprising template to import a module and get a type from it inside the declaration of the type of a parameter to a function, so that the module need not be imported outside of the function definition. I think there was a blog article some years ago about this where there was some indication that this or something with equivalent effect would be incorporated into D in some way. How do I define a function with a parameter that is a type in an outside module while keeping module import local to that definition? Are you thinking of this? https://dlang.org/phobos/object.html#.imported -Steve
import locality with function parameters
Hello, I seem to recall that there is surprising template to import a module and get a type from it inside the declaration of the type of a parameter to a function, so that the module need not be imported outside of the function definition. I think there was a blog article some years ago about this where there was some indication that this or something with equivalent effect would be incorporated into D in some way. How do I define a function with a parameter that is a type in an outside module while keeping module import local to that definition?
Re: Setting field of struct object
On Monday, 22 January 2024 at 08:27:36 UTC, Joel wrote:
```d
import std;
struct Person {
string name, email;
ulong age;
auto withName(string name) { this.name=name; return this; }
auto withEmail(string email) { this.email=email; return
this; }
auto withAge(ulong age) { this.age=age; return this; }
}
void main() {
Person p;
p.withName("Tom").withEmail("joel...@gmail.com").withAge(44);
writeln(p);
}
```
I had reason to need this to work a while ago and `opDispatch`
came in very handy. I was able to cook up one that forwarded
calls to other members in a struct, while returning `this` by
ref, allowing for chaining calls. I use it with UDAs.
(Scroll to the unit tests for examples.)
```d
/++
Mixin template generating an `opDispatch` redirecting calls
to members whose
names match the passed variable string but with an underscore
prepended.
+/
mixin template UnderscoreOpDispatcher()
{
ref auto opDispatch(string var, T)(T value)
{
import std.traits : isArray, isAssociativeArray,
isSomeString;
enum realVar = '_' ~ var;
alias V = typeof(mixin(realVar));
static if (isAssociativeArray!V)
{
// Doesn't work with AAs without library solutions
}
else static if (isArray!V && !isSomeString!V)
{
mixin(realVar) ~= value;
}
else
{
mixin(realVar) = value;
}
return this;
}
auto opDispatch(string var)() inout
{
enum realVar = '_' ~ var;
return mixin(realVar);
}
}
///
unittest
{
struct Foo
{
int _i;
string _s;
bool _b;
string[] _add;
alias wordList = _add;
mixin UnderscoreOpDispatcher;
}
Foo f;
f.i = 42; // f.opDispatch!"i"(42);
f.s = "hello";// f.opDispatch!"s"("hello");
f.b = true; // f.opDispatch!"b"(true);
f.add("hello"); // f.opDispatch!"add"("hello");
f.add("world"); // f.opDispatch!"add"("world");
assert(f.i == 42);
assert(f.s == "hello");
assert(f.b);
assert(f.wordList == [ "hello", "world" ]);
auto f2 = Foo()
.i(9001)
.s("world")
.b(false)
.add("hello")
.add("world");
assert(f2.i == 9001);
assert(f2.s == "world");
assert(!f2.b);
assert(f2.wordList == [ "hello", "world" ]);
}
```
You could trivially adapt it to use a `withName`, `withEmail`
calling scheme instead of the underscore thing.
Re: Setting field of struct object
On Monday, 22 January 2024 at 15:47:23 UTC, bachmeier wrote: On Monday, 22 January 2024 at 15:45:45 UTC, zjh wrote: On Monday, 22 January 2024 at 15:33:01 UTC, ryuukk_ wrote: it only took me 1 project to never want to touch C++ again.. D language used to have no `copy constructor`, isn't it now added in again? You have to admit the good aspects of `C++`. You should take a look at the `latest C++`. C++ has already learned many advantages of `D`, but D has not made `significant progress`! As a user, `C++` is really not much different from D, and even surpasses D `in many aspects`. `RAII `, `variable parameter` template, `coroutine, concept`, `value semantics`, very easy to understand. Moreover, the `inheritance` of C++ is very enjoyable to use in many aspects. Sounds like you should be using C++. Why are you here? Everyone who uses D should be welcome, even if they have a preference for another language, or a preference for features in another language. This is how D will evolve and improve. And this should include people who don't like the untyped universe of the D module (specifically, its lack of an optional mechanism for information hiding within a module). People can think of it as if it were typed, but this is just an illusion. This illusion can easily lead to type confusion and inconsistent and erroneous interactions - i.e. bugs. To avoid this in D one needs to literally reorganise that untyped universe into into a typed system. Now your types impose constraints which will help to enforce their correctness. Organisation is important of course, but for using types in D, its vital - if strong typing is your objective. I think D is clumsy in many other areas as well. btw. I too prefer multiple inheritance.
Re: how can I load html files and not .dt or diet files in vibe.d
On Thursday, 1 February 2024 at 03:20:31 UTC, dunkelheit wrote: this is my code, I'm a begginer on vibe, and I want to use html and not diet files Take a look at the static file example, I think that's close to what you're looking for. https://github.com/vibe-d/vibe.d/blob/master/examples/http_static_server/source/app.d
Re: how can I load html files and not .dt or diet files in vibe.d
On Thursday, 1 February 2024 at 03:20:31 UTC, dunkelheit wrote:
!!! 5
html
body
h1 hello diet
-iframe("hola.html")
please help me :')
Try
```
html
body
h1 hello diet
iframe(src="hola.html")
```
