Re: mir.ndslice : multi dimensional associative array - Example/Docs
On Monday, 26 October 2020 at 14:31:00 UTC, Vino wrote:
Hi All,
Is it possible to create a multi dimensional associative
array using mir.ndslice,
if yes,
(1): request you to point me to some example / docs
(2): below is an example multi dimensional associative array
using the core d module, and
how can we to implement the same using mir.ndslice.
(3): What are the pros and cons of using mir.ndslice over
the core d module.
import std.stdio;
void main () {
string[int][string] aa;
aa["Name"] = [1: "test01", 2:"test02"];
aa["Pool"] = [1: "Development", 2:"Quality"];
foreach(i; aa["Pool"].byValue) { writeln(i); }
}
From,
Vino.B
No. ndslice provides rectangular arrays. An associative array (as
it defined in D) can't be really 2D, instead, it is an AA of AAs
like in your example. A real 2D analog associative arrays are
DataFrames. It is a postponed WIP ndslice feature.
Ilya
Re: Is there something I'm not getting here?
On Tuesday, 27 October 2020 at 02:21:39 UTC, matheus wrote: On Tuesday, 27 October 2020 at 01:26:56 UTC, James Blachly wrote: On 10/26/20 9:19 PM, Ruby The Roobster wrote: Following code doesn't work(it's not the actual code but it represents it). Is there some rule about function overrides that I don't know about? ... The error I keep getting no matter what says: Error: Multiple Overrides of Same Function. Anybody know what I should do? It works for me. ... I think he is referring to this: ... I mean he may be having a duplicate method in the same class. Matheus.
Re: Is there something I'm not getting here?
On Tuesday, 27 October 2020 at 01:26:56 UTC, James Blachly wrote:
On 10/26/20 9:19 PM, Ruby The Roobster wrote:
Following code doesn't work(it's not the actual code but it
represents it). Is there some rule about function overrides
that I don't know about?
...
The error I keep getting no matter what says: Error: Multiple
Overrides of Same Function. Anybody know what I should do?
It works for me.
...
I think he is referring to this:
import std;
class B{
public override string toString(){
return null;
}
public override string toString(){
return toString(null);
}
}
void main() {
B b = new P();
}
Error: function `B.toString` multiple overrides of same function
You can view: https://www.jdoodle.com/iembed/v0/3rm
Matheus.
How is this an "Access Violation"
Following function when called throws an access violation. I
think it has to do with the assert statements, but I don't know
why.
void construct(string type,atom base,atom bonded)
{
base = new
atom(base.name.idup,base.mass,base.electro_negativity,base.valence_electrons,base.electrons,base.protons,base.neutrons,base.pos);
bonded = new
atom(bonded.name.idup,bonded.mass,bonded.electro_negativity,bonded.valence_electrons,bonded.electrons,bonded.protons,bonded.neutrons,bonded.pos);
if(type == "single")
{
assert(this.base.valence >= 1 && this.bonded.valence
>=1 && this.base.electro_negativity >= 0 &&
this.bonded.electro_negativity >= 0,"For a single bond, both
atoms need to have at least one free electron and have to have
electro negativity.");
this.type = "single".dup;
}
else if(type == "double")
{
assert(this.base.valence >= 2 && this.bonded.valence
>=2 && this.base.electro_negativity >= 0 &&
this.bonded.electro_negativity >= 0,"For a double bond, both
atoms need to have at least one free electron and have to have
electro negativity.");
this.type = "double".dup;
}
else if(type == "triple")
{
assert(this.base.valence >= 3 && this.bonded.valence
>=3 && this.base.electro_negativity >= 0 &&
this.bonded.electro_negativity >= 0,"For a triple bond, both
atoms need to have at least one free electron and have to have
electro negativity.");
this.type = "triple".dup;
}
else if(type == "ionic")
{
bool this_electro_negativity_greater;
if((this.base.electro_negativity >
this.bonded.electro_negativity))
this_electro_negativity_greater = true;
else if((this.base.electro_negativity <
this.bonded.electro_negativity))
this_electro_negativity_greater = false;
if(this_electro_negativity_greater)
{
assert(((this.base._valence_electrons ==
this.base.valence) && (this.bonded._valence_electrons ==
this.bonded.valence)),"Atoms in an ionic bond can't already be
ions.");
int fullValence;
if(this.base.electrons < 2)
fullValence = 2;
else
fullValence = 8;
assert((fullValence -
this.base.valence_electrons) ==
(this.bonded.valence_electrons),"The amount valence electrons in
the atom with less valence electrons must be the same as the
value of (8 - (the amount of valence electrons in the atom with
more valence electrons))");
}
else
{
assert(((this.base._valence_electrons ==
this.base.valence) && (this.bonded._valence_electrons ==
this.bonded.valence)),"Atoms in an ionic bond can't already be
ions.");
int thatFullValence;
if(this.bonded.electrons < 2)
thatFullValence = 2;
else
thatFullValence = 8;
assert((thatFullValence -
this.bonded.valence_electrons) ==
(this.base.valence_electrons),"The amount valence electrons in
the atom with less valence electrons must be the same as the
value of (8 - (the amount of valence electrons in the atom with
more valence electrons))");
}
}
}
Re: Is there something I'm not getting here?
On Tuesday, 27 October 2020 at 01:19:58 UTC, Ruby The Roobster
wrote:
Following code doesn't work(it's not the actual code but it
represents it). Is there some rule about function overrides
that I don't know about?
class a {
public override string toString() {
//...
}
}
class b : a {
public override string toString() {
//...
}
}
The error I keep getting no matter what says: Error: Multiple
Overrides of Same Function. Anybody know what I should do?
Okay. Realized this wasn't actually affecting my program, but is
there any explanation for why this doesn't work?
Re: Is there something I'm not getting here?
On 10/26/20 9:19 PM, Ruby The Roobster wrote:
Following code doesn't work(it's not the actual code but it represents
it). Is there some rule about function overrides that I don't know about?
...
The error I keep getting no matter what says: Error: Multiple Overrides
of Same Function. Anybody know what I should do?
It works for me.
The "shorten" link on run.dlang.io no longer works, but here is a
working example:
```
import std;
class A {
public override string toString() {
return "a";
}
}
class B : A {
public override string toString() {
return "b";
}
}
void main()
{
A a = new A();
B b = new B();
writeln(a);
writeln(b);
}
```
Is there something I'm not getting here?
Following code doesn't work(it's not the actual code but it
represents it). Is there some rule about function overrides that
I don't know about?
class a {
public override string toString() {
//...
}
}
class b : a {
public override string toString() {
//...
}
}
The error I keep getting no matter what says: Error: Multiple
Overrides of Same Function. Anybody know what I should do?
How Stop Worker Thread if Owner Thread is Finished?
Because when the main thread is completed the worker thread continues to run.
Re: String Template Package
On Mon, Oct 26, 2020 at 11:36:12PM +, Per Nordlöw via Digitalmars-d-learn wrote: > I need a string template system for generation of parsers in D code to > compiled in separate phase (not Pegged). > > What packages is there for this? Adela Vais is working on D support for GNU bison, a parser generator that uses a separate compile phase. I don't know how far she has gotten and how usable the current support is, but it's something to keep an eye out for. T -- Let's call it an accidental feature. -- Larry Wall
String Template Package
I need a string template system for generation of parsers in D code to compiled in separate phase (not Pegged). What packages is there for this?
C++ code to D (multi dem 3d mesh)
```
struct vec3d
{
float x, y, z;
}
struct triangle
{
vec3d[3] p;
}
struct mesh
{
triangle[] tris;
}
// This here
meshCube.tris = {
// SOUTH
{ 0.0f, 0.0f, 0.0f,0.0f, 1.0f, 0.0f,1.0f, 1.0f, 0.0f },
{ 0.0f, 0.0f, 0.0f,1.0f, 1.0f, 0.0f,1.0f, 0.0f, 0.0f },
// EAST
{ 1.0f, 0.0f, 0.0f,1.0f, 1.0f, 0.0f,1.0f, 1.0f, 1.0f },
{ 1.0f, 0.0f, 0.0f,1.0f, 1.0f, 1.0f,1.0f, 0.0f, 1.0f },
// NORTH
{ 1.0f, 0.0f, 1.0f,1.0f, 1.0f, 1.0f,0.0f, 1.0f, 1.0f },
{ 1.0f, 0.0f, 1.0f,0.0f, 1.0f, 1.0f,0.0f, 0.0f, 1.0f },
// WEST
{ 0.0f, 0.0f, 1.0f,0.0f, 1.0f, 1.0f,0.0f, 1.0f, 0.0f },
{ 0.0f, 0.0f, 1.0f,0.0f, 1.0f, 0.0f,0.0f, 0.0f, 0.0f },
// TOP
{ 0.0f, 1.0f, 0.0f,0.0f, 1.0f, 1.0f,1.0f, 1.0f, 1.0f },
{ 0.0f, 1.0f, 0.0f,1.0f, 1.0f, 1.0f,1.0f, 1.0f, 0.0f },
// BOTTOM
{ 1.0f, 0.0f, 1.0f,0.0f, 0.0f, 1.0f,0.0f, 0.0f, 0.0f },
{ 1.0f, 0.0f, 1.0f,0.0f, 0.0f, 0.0f,1.0f, 0.0f, 0.0f },
};
```
See:
https://youtu.be/ih20l3pJoeU
https://github.com/OneLoneCoder/videos/blob/master/OneLoneCoder_olcEngine3D_Part1.cpp
Re: Given a TypeInfo_Class, instance a new object of its type
On Monday, 26 October 2020 at 21:57:18 UTC, Not A Rectangle wrote: Is this possible to do? Only if you know the type ahead of time, then you can cast it. Normally you'd probably just know an interface or base class it implements then you can cast to that, with the exact derived type being only known at runtime.
Given a TypeInfo_Class, instance a new object of its type
Hi everyone, Say i have a TypeInfo_Class representing a custom type, and i want a new instance of this class with its custom type, is there a way to do that? I am aware that TypeInfo_Class has the methods create() and factory(), both of which return a new object of the type Object. I have tried to figure out a way to cast to the custom type using cast(...), but it seems i can't get the custom type held in TypeInfo in a way cast() will accept. Is this possible to do? Thanks
Re: How can I use class and wasm?
On Friday, 16 October 2020 at 03:42:22 UTC, Adam D. Ruppe wrote:
On Friday, 16 October 2020 at 03:04:25 UTC, Jack wrote:
How can I allocate memory for this class?
It is possible but not easy without druntime.
If you are using -betterC, you can use extern(C++) classes with
extern(D) members. The compiler will let you declare that. But
then you need to allocate it. `__traits(classInstanceSize,
Whatever)` will tell you the size to malloc, but you also need
to copy an initializer over before you call the constructor.
I have a technique here that works on dmd...
http://dpldocs.info/this-week-in-d/Blog.Posted_2020_07_27.html#zero-runtime-classes
I did consider do something like this but the class would only
live in the function's lifetime, right? that wouldn't work if I
need to pass the class around
but ldc is more strict about the type definition and I don't
know the magic it expects there... like it should be doable but
idk how so this might not be of much use.
Which type definition are you refering to? you mean the class
members/memory layout of a class?
Personally, I prefer to just not use betterC and make my own
mini runtime:
I was thinking the same, this seems the way to go.
http://dpldocs.info/this-week-in-d/Blog.Posted_2020_08_10.html
in particular
This is great! I'll try write a small druntime too for my case.
Do you have links/resources where things like __heap_base,
__data_end are defined? assuming there's such documentation
somewhere, if you did into the compiler to get those, let me know
where you can it too. I didn't understand the interation of
webassembly-core.js with D. for example, you have this:
// placeholder to be filled in by the loader
var memory;
How did you put the compiler/linker to set memory's location
properly so you can do things like:
memorySize: function() { return memory.buffer.byteLength; },
?
in the same way that ldc defines __headp_base and __data_end,
doesn't it define some variables where the implementation of
memorySize() and growMemory() could be done in D? also, where can
I find this Sebastiaan's project that you mentioned in the
article? it's a druntime like yours?
https://github.com/adamdruppe/webassembly/blob/master/arsd-webassembly/object.d#L74
this is great, good enough to put me in the direction on how to
do that. Also, I found C++ has this EMSCRIPTEN_BINDINGS() from
emscripten/bind.h header, see[1] for example. I haven't tried
yet. But maybe marking the class as extern(C) that would work
with D's class too, right? I don't know about the C++'s or
compiler's dependences that would prevent it from working with D.
In fact, that seems quite a hacky. Do you think we are better off
write our own small druntime? if I got an working nice one, I'll
put on github for those who would like to use this.
[1]:
https://stackoverflow.com/questions/15865923/interaction-with-c-classes-in-emscripten
Thanks for your answer, that was really helpful.
But that's also not easy, lots of unfinished cases in my thing,
but I did manage to make it work... for my specific case.
Foreach output into a multi dimensional associative array.
Hi All,
Request your help on the below on how to store the output to a
multi dimensional associative array.
Code:
import std.stdio: writeln;
import asdf: parseJson;
import std.conv: to;
void main()
{
string[int][string] aa;
string apidata = `{"items":
[
{"name":"T01","hostname":"test01","pool":"Development"}
{"name":"T02","hostname":"test02","pool":"Quality"},
{"name":"T03","hostname":"test03","pool":"Production"}
]
}`;
auto jv = parseJson(apidata);
foreach(j; jv["items"].byElement()){
aa["Name"] = j["name"].get!string("default");
i++;
}
writeln(aa);
}
Expected Output
aa["Name"] = [T01, T01, T03]
aa["Hostname"] = [test01, test02, test03]
aa["Pool"] = [Development, Quality, Production]
From,
Vino.B
Re: static alias this and if/do/while/for
On Thursday, 22 October 2020 at 21:55:59 UTC, Jack Applegame
wrote:
There is a funny feature (or bug) in the D language:
static alias this and static operator overloading.
For example
interface Foo {
static {
int value;
void opAssign(int v) { value = v; }
int get() { return value; }
alias get this;
}
}
Now we can use type Foo as if it were an lvalue/rvalue:
Foo = 5;
int a = Foo;
int b = Foo + a;
I heavily use this feature in my MCU library.
It doesn't surprise me that much. What actually did was that
static opIndex() works. Consider this:
struct X
{
static int opIndex() { return 1; }
}
alias SliceOf(T) = T[];
enum ValueOf(T) = T[];
static assert( ! is(int[SliceOf!X] == int[ValueOf!X]));
But static opIndex and friends can be useful:
https://run.dlang.io/is/s15zS0 I'd actually find it awesome if we
had opCallAssign and opCallOpAssign; the reason I used opIndex
and not opCall is that way, one gets access to the right-hand
side and to-assign parameters by reference, so no internal
pointer stuff's needed.
But it doesn't work inside conditionals:
if(Foo) {}// Error: type Foo is not an expression
while(Foo) {} // Error: type Foo is not an expression
Even if we define `static opCast!bool()`. It doesn't help.
Only using Foo.opCast!bool works; cast(bool) won't compile.
Should this be fixed?
The bool stuff should be fixed. The other direction would be a
breaking change.
Re: `unittest` placement in code?
On Monday, 26 October 2020 at 13:16:32 UTC, Vladimirs Nordholm
wrote:
Hello.
[...]
Additionally, if you care about generating documentation, then
placing them after whatever is being tested can make them end up
as examples (of how to use them). Handy if your unittests shows
how they're used and not only tests that they work; not so much
otherwise.
class Foo
{
/// asdf
int multiplier;
/++
Multiplies stuff by `multiplier`.
Params:
n = Number to multiply.
Returns:
The integer passed, multiplied by `multiplier`.
+/
int mul(int n)
{
return multiplier * n;
}
///
unittest
{
// Will end up in examples section, provided /// is
placed above unittest
Foo foo = new Foo;
foo.multiplier = 2;
int four = foo.mul(2);
int six = foo.mul(3);
int eight = foo.mul(4);
int ten = foo.mul(5);
}
}
https://i.imgur.com/zjuJQkR.jpg
Even so I keep my larger test suite in a separate tests/
directory next to source/, but mostly because they'd swamp the
original source files. You also lose the ability to unittest
private stuff this way.
mir.ndslice : multi dimensional associative array - Example/Docs
Hi All,
Is it possible to create a multi dimensional associative array
using mir.ndslice,
if yes,
(1): request you to point me to some example / docs
(2): below is an example multi dimensional associative array
using the core d module, and
how can we to implement the same using mir.ndslice.
(3): What are the pros and cons of using mir.ndslice over the
core d module.
import std.stdio;
void main () {
string[int][string] aa;
aa["Name"] = [1: "test01", 2:"test02"];
aa["Pool"] = [1: "Development", 2:"Quality"];
foreach(i; aa["Pool"].byValue) { writeln(i); }
}
From,
Vino.B
Re: `unittest` placement in code?
On Monday, 26 October 2020 at 13:36:58 UTC, Steven Schveighoffer wrote: On 10/26/20 9:16 AM, Vladimirs Nordholm wrote: [...] Wherever you want. Generally people put it right after the thing being tested to keep files organized. When the compiler runs unittests it runs them all in the sequence they are in the file. One place to be cautious though -- if you put them inside a template, they will be created for every instantiation of that template. -Steve Thanks for the explanation (and the warning) Steve :)
Re: `unittest` placement in code?
On 10/26/20 9:16 AM, Vladimirs Nordholm wrote: Hello. I have a class which I have written some tests for, to ensure if I ever change some code it will still work as intended. The documentation https://dlang.org/spec/unittest.html says it is can be placed both in the class or outside it. I come from a background of having a completely separate tests folder with only tests, so I do not know what the general best-practice is with D. Where should the `unittest` code block go? Wherever you want. Generally people put it right after the thing being tested to keep files organized. When the compiler runs unittests it runs them all in the sequence they are in the file. One place to be cautious though -- if you put them inside a template, they will be created for every instantiation of that template. -Steve
Re: Can we do compile time reading part of a file using import?
On 10/23/20 12:42 PM, data pulverizer wrote:
Hi all,
the `import` function allows a file to be read at compile time, which
opens up great opportunities for (mostly binary) file IO, where data
types can be coded into files - the user doesn't need to know data types
ahead of time. As specified in my old blog article:
https://www.active-analytics.com/blog/reading-idx-files-in-d/.
Binary files can be very large and reading the whole file at compile
time is often unnecessary.
This isn't exactly the intended use for the function, but there it is.
Since compile time read capability already exists and is useful, adding
capability to be able to read only a portion of the file at compile time
in a given location is advantageous and has utility.
For me it's not make-or-break, it just something very useful and I think
has clear use case. Please let me know if there are aspects or
alternatives I am missing.
I see no reason why the compiler can't do something special with:
enum slicedFile = import("foo.bin")[0 .. 100];
One thing that comes to mind -- most OSes support memory-mapped files.
If import simply did a memory mapped file internally, and duplicated the
string once actually used somewhere, then you can avoid full reading of
the data until it's necessary.
-Steve
Re: static alias this and if/do/while/for
On Thursday, 22 October 2020 at 21:55:59 UTC, Jack Applegame wrote: Now we can use type Foo as if it were an lvalue/rvalue: Foo = 5; int a = Foo; int b = Foo + a; Haha, that's pretty neat!
`unittest` placement in code?
Hello. I have a class which I have written some tests for, to ensure if I ever change some code it will still work as intended. The documentation https://dlang.org/spec/unittest.html says it is can be placed both in the class or outside it. I come from a background of having a completely separate tests folder with only tests, so I do not know what the general best-practice is with D. Where should the `unittest` code block go?
Re: this T / variadic template and interfaces
On Monday, 26 October 2020 at 11:14:47 UTC, frame wrote: Is there any way to get this working? I know, I could use a known object to feed the arguments and use that instead - but I want to keep things simple as possible. As Simen mentioned, templates cannot be virtual. But you don't need to use a template, you can use a regular variadic method [1]. It's a bit more clunky to work with than template variadic functions. Or if all the arguments will be of the same type, you can use type safe variadic functions [2], which are easier to work with. [1] https://dlang.org/spec/function.html#d_style_variadic_functions [2] https://dlang.org/spec/function.html#typesafe_variadic_functions -- /Jacob Carlborg
Re: Template pattern delegate?
On Monday, 26 October 2020 at 09:25:03 UTC, Jacob Carlborg wrote:
On Monday, 26 October 2020 at 00:56:26 UTC, frame wrote:
If you pass the delegate as a template parameter/alias
parameter, it's more likely to be inlined:
auto myStuff(alias fn)() {
try return fn();
catch (Exception e) { }
}
myStuff!( { /* some code */ } );
--
/Jacob Carlborg
Does not work in my case. Seems to conflict with overloads, but
thanks for the hint.
Re: this T / variadic template and interfaces
On Monday, 26 October 2020 at 11:48:48 UTC, Simen Kjærås wrote: This makes sense if you consider that the user of the interface has no knowledge of the types that implement it, and vice versa: the implementing class has no idea which instantiations to make, and the user has no idea which implementing classes to create instantiations for. Templates require that the user have full knowledge of the templates to be instantiated. There are some workarounds of sorts, but they depend heavily on what you're trying to achieve. Can you use an array of std.variant.Variant, for instance? -- Simen Yes, the user/coder does not know of other types by any chance. The interface must be used. Well I guess I let the interface do the variadic stuff and pass the argument as Variant[] to the wrapper in a new interface method. Thanks.
Re: this T / variadic template and interfaces
On Monday, 26 October 2020 at 11:14:47 UTC, frame wrote: Did not find this topic: I have an interface and some wrapper classes that use it. The wrapper's methods should accept variadic arguments. The runtime should only work with the interface, trying casting to a wrapper is not an option, because it's a plugin design. - defining a variadic template in wrapper does not work, because we are working with the interface only and compiler complains method is not callable with argument X - defining a variadic template without body in interface causes linker errors, which makes sense somehow - defining a variadic template with body in interface could work if the compiler would get the right "this" type but sadly, "this" refers to interface and also "this T" refers to interface too. Is there any way to get this working? I know, I could use a known object to feed the arguments and use that instead - but I want to keep things simple as possible. Templates can't be virtual, so even if they can be defined in an interface, you can't override them in a class that implements said interface - the implementation needs to be in the interface itself. This makes sense if you consider that the user of the interface has no knowledge of the types that implement it, and vice versa: the implementing class has no idea which instantiations to make, and the user has no idea which implementing classes to create instantiations for. Templates require that the user have full knowledge of the templates to be instantiated. There are some workarounds of sorts, but they depend heavily on what you're trying to achieve. Can you use an array of std.variant.Variant, for instance? -- Simen
this T / variadic template and interfaces
Did not find this topic: I have an interface and some wrapper classes that use it. The wrapper's methods should accept variadic arguments. The runtime should only work with the interface, trying casting to a wrapper is not an option, because it's a plugin design. - defining a variadic template in wrapper does not work, because we are working with the interface only and compiler complains method is not callable with argument X - defining a variadic template without body in interface causes linker errors, which makes sense somehow - defining a variadic template with body in interface could work if the compiler would get the right "this" type but sadly, "this" refers to interface and also "this T" refers to interface too. Is there any way to get this working? I know, I could use a known object to feed the arguments and use that instead - but I want to keep things simple as possible.
Re: Help on asdf json module
On Monday, 26 October 2020 at 09:43:44 UTC, Vino wrote: On Sunday, 25 October 2020 at 08:22:06 UTC, 9il wrote: [...] Hi All, Thank you for your help, and now need your suggestion as the below code is working and it also prints an additional value which is not expected, so request your help on how to avoid the additional value, [...] Hi All, Sorry, I was able to find the issue as there was an additional writeln in the code hence the additional output was printed. From, Vino.B
Re: Help on asdf json module
On Sunday, 25 October 2020 at 08:22:06 UTC, 9il wrote:
On Sunday, 25 October 2020 at 06:05:27 UTC, Vino wrote:
Hi All,
Currently we are testing various json module such as
"std.json, std_data_json, vibe.data.json and asdf", the below
code works perfectely while use "std_data_json or
vibe.data.json" but not working as expected when we use "asdf"
and throwing the below error, hence request your help on the
same.
[...]
Hi Vino,
byElement should be used here for ASDF.
foreach(j; jv["items"].byElement)
http://asdf.libmir.org/asdf_asdf.html#.Asdf.byElement
Hi All,
Thank you for your help, and now need your suggestion as the
below code is working and it also prints an additional value
which is not expected, so request your help on how to avoid the
additional value,
Code:
import std.stdio: writeln;
import asdf: parseJson;
import std.conv: to;
import std.range: takeExactly;
import std.array: split;
void main()
{
string apidata = `{"items":
[
{"name":"T01","hostname":"test01","pool":"Development","type":
[{"Value":"D,d...@dev.com,DEV"},{"Value":"000"}]},
{"name":"T02","hostname":"test02","pool":"Quality","type":
[{"Value":"Q,q...@qas.com,QAS"},{"Value":"100"}]},
{"name":"T03","hostname":"test03","pool":"Production","type":
[{"Value":"P,p...@prd.com,PRD"},{"Value":"100"}]}
]
}`;
auto jv = parseJson(apidata);
foreach(j; jv["items"].byElement()){
foreach(i; j["type"].byElement().takeExactly(1)) {
writeln(i["Value"].get!string("default").split(",")[1]);
}
}
}
Output:
d...@dev.com
q...@qas.com
p...@prd.com
[] // additional value which is not expected
From,
Vino.B
Re: Template pattern delegate?
On Monday, 26 October 2020 at 00:56:26 UTC, frame wrote:
I see that your approach can handle functions and delegates but
isn't that not equivalent like this template for a function?
auto myStuff(T)(T function() fn) {
try {
return fn();
}
catch (Exception e) {
//
}
}
You cannot pass a delegate to something that expects a function
pointer.
I wonder if I could use such a template as static variant and
the compiler just expands the code? Just thinking that using a
function or delegate is an overhead. Maybe not a function but a
delegate will allocate GC memory I think.
If you pass the delegate as a template parameter/alias parameter,
it's more likely to be inlined:
auto myStuff(alias fn)() {
try return fn();
catch (Exception e) { }
}
myStuff!( { /* some code */ } );
--
/Jacob Carlborg
Re: Can we do compile time reading part of a file using import?
On Sunday, 25 October 2020 at 16:50:09 UTC, Jack wrote: Which build tool are you refering to? an existing one or build one oneself to do this job? It should work with any build tool that has hooks to execute arbitrary commands. -- /Jacob Carlborg
