Re: Is std.variant.visit not @nogc?
On Monday, 9 April 2018 at 03:20:58 UTC, helxi wrote:
Is std.variant.visit not @nogc?
These error messages REALLY need to be fixed.
visit, being a template, is @nogc or not based on the arguments
passed to it as well as its own body, so while the error messages
point to visit itself, these are frequently actually caused the
predicate your pass.
well, in this case, it is actually visit itself.
phobos/std/variant.d(2464): Error: @nogc function
std.variant.visitImpl!(true, VariantN!(8u, int, string), function
(string s) => printf("%s\x0a", cast(immutable(char)*)s), function
(int n) => printf("%i\x0a", n)).visitImpl cannot call non-@nogc
constructor std.variant.VariantException.this
phobos/std/variant.d(2469): Error: @nogc function
std.variant.visitImpl!(true, VariantN!(8u, int, string), function
(string s) => printf("%s\x0a", cast(immutable(char)*)s), function
(int n) => printf("%i\x0a", n)).visitImpl cannot call non-@nogc
function std.variant.VariantN!(8u, int,
string).VariantN.peek!int.peek
phobos/std/variant.d(2469): Error: @nogc function
std.variant.visitImpl!(true, VariantN!(8u, int, string), function
(string s) => printf("%s\x0a", cast(immutable(char)*)s), function
(int n) => printf("%i\x0a", n)).visitImpl cannot call non-@nogc
function std.variant.VariantN!(8u, int,
string).VariantN.peek!string.peek
phobos/std/variant.d(2173): Error: template instance
`std.variant.visitImpl!(true, VariantN!(8u, int, string),
function (string s) => printf("%s\x0a", cast(immutable(char)*)s),
function (int n) => printf("%i\x0a", n))` error instantiating
Ugh, so unreadable even on this level, but at least the actual
information is there:
std.variant.VariantException.this is not marked @nogc (but it
prolly could be)
VariantN.peek is not @nogc because it calls Object.opEquals...
which is broken af, sadly, but can probably be fixed for this
case by marking TypeInfo.opEquals nogc.
I think the peek one is going to be the harder one to work around
since any reimplementation of peek is probably going to still
call it... though MAYBE you can use `!is` instead of `!=`... and
any reimplementation of visit needs to check types.
But if you wanna try to work around it, I would copy the
visitImpl and visit functions out of std.variant and do some
adjustments, then call your version instead (which will be fairly
easy btw since they are already UFCS).
FYI: the way I got these error messages was to go into the Phobos
source and add @nogc to the lowest level template in the
instantiation chain. Then just recompile your program - no need
to recompile Phobos itself since they are templates.
I wish the error messages would just do this for you (simulate
@nogc at the second-highest level) to keep you from having to
edit it yourself just to know what it is.
Is std.variant.visit not @nogc?
import std.variant, core.stdc.stdio;
Algebraic!(T, string) fib_nth(T)(T n)
{
return n % 15
? n % 5
? n % 3
? Algebraic!(T, string)(n)
: Algebraic!(T, string)("Fizz")
: Algebraic!(T, string)("Buzz")
: Algebraic!(T, string)("Fizzbuzz");
}
void main() @nogc
{
foreach (i; 1 .. 101)
{
fib_nth(i).visit!(
(string s) => printf("%s\n", s.ptr),
(int n) => printf("%i\n", n)
);
}
}
Complains source/app.d(18,19): Error: @nogc function D main
cannot call non-@nogc function std.variant.visit!(function
(string s) => printf("%s\x0a", cast(immutable(char)*)s), function
(int n) => printf("%i\x0a", n)).visit!(VariantN!(16LU, int,
string)).visit
/usr/bin/dmd failed with exit code 1.
If so, is there a way to emulate `visit` in a @nogc setting?
Re: Game and GC
On Monday, 9 April 2018 at 01:01:18 UTC, Chris Katko wrote: Why... associative arrays? Wouldn't that become expensive when you hit 1,000s, or 10,000's of objects, for something as tiny as a coordinate (two or three floats) lookup? Well, that's the other reason why I was looking for a different solution. Currently it's quite fast, maybe because it uses integers for the most part (only transformation effects use floats due to easier workarounds with vectorization), might replace the multiple associative arrays with a single auto-sorting one.
Re: Checking if a function pointer is set or null
On Monday, April 09, 2018 00:25:08 solidstate1991 via Digitalmars-d-learn
wrote:
> Would the if(!(myFunctionPointer is null)){} work is I
> intended?
You can also do
if(myFunctionPointer !is null)
- Jonathan M Davis
Re: Checking if a function pointer is set or null
On Monday, 9 April 2018 at 00:25:08 UTC, solidstate1991 wrote:
Would the if(!(myFunctionPointer is null)){} work is I
intended?
Yes, that works as you expect
https://run.dlang.io/is/ZTtm0P
Re: Game and GC
On Monday, 9 April 2018 at 00:25:21 UTC, solidstate1991 wrote: On Saturday, 24 February 2018 at 07:12:21 UTC, Guillaume Piolat wrote: From my experience a combination of the following is necessary: - not having the audio thread registered - using pools aggressively for game entities Also you can save a lot of clockcycles if you put @nogc everywhere you don't allocate on the heap, the stack will be automatically cleaned up. I'm currently thinking on restructuring the way my engine handles display lists on sprites (dynamic array contains the priority, multiple associative arrays for Coordinates, sprites, attributes), however if enabling exception handling in @nogc parts will enable associative array indexing, I'll just skip the whole procedure, otherwise probably moving the whole thing to rbtree. Why... associative arrays? Wouldn't that become expensive when you hit 1,000s, or 10,000's of objects, for something as tiny as a coordinate (two or three floats) lookup?
Checking if a function pointer is set or null
Would the if(!(myFunctionPointer is null)){} work is I
intended?
Re: Game and GC
On Saturday, 24 February 2018 at 07:12:21 UTC, Guillaume Piolat wrote: From my experience a combination of the following is necessary: - not having the audio thread registered - using pools aggressively for game entities Also you can save a lot of clockcycles if you put @nogc everywhere you don't allocate on the heap, the stack will be automatically cleaned up. I'm currently thinking on restructuring the way my engine handles display lists on sprites (dynamic array contains the priority, multiple associative arrays for Coordinates, sprites, attributes), however if enabling exception handling in @nogc parts will enable associative array indexing, I'll just skip the whole procedure, otherwise probably moving the whole thing to rbtree.
Re: stirling numbers and multidimensional arrays
On 04/08/2018 06:15 PM, popgen wrote:
I am trying to implement some code to calculate Stirling numbers. The
code shown below provides the correct calculation but throws a
Segmentation fault: 11 once it is done running. I suspect there is
something with the way I am setting up the multidimensional array.
[...]
int stirling1(int n, int k)
{
auto matrix = new int[][](n+1,k+1) ;
[...]
for(int i = 1; i <= n ; i++)
{
for(int q = 1; q <= i ; q++)
Should it be `q <= k` here? You're using q as an index into an array of
length k + 1. If you go up to i, you'll exceed that and go out of bounds.
That you're seeing a segfault instead of a range error indicates that
you're compiling with -release. Better not do that when debugging.
stirling numbers and multidimensional arrays
I am trying to implement some code to calculate Stirling numbers.
The code shown below provides the correct calculation but throws
a Segmentation fault: 11 once it is done running. I suspect there
is something with the way I am setting up the multidimensional
array.
import std.stdio;
import std.datetime ;
import std.conv ;
import std.file;
import std.string;
import std.regex;
import std.bigint ;
import std.range : enumerate;
int stirling1(int n, int k)
{
auto matrix = new int[][](n+1,k+1) ;
for(int i = 0; i <= n; i++)
{
matrix[i][0] = 0 ;
}
for(int i = 0; i <= k; i++)
{
matrix[0][k] = 0 ;
}
for(int i = 1; i <= n ; i++)
{
for(int q = 1; q <= i ; q++)
{
if(q == 1 || i == q)
{
matrix[i][q] = 1 ;
}
else
{
matrix[i][q] = q*matrix[i-1][q] +
matrix[i-1][q-1] ;
}
}
}
return(matrix[n][k]) ;
}
void main()
{
writeln("s(n,k) for s(7,2)") ;
writeln(stirling1(7,2)) ;
}
Re: toString contains null for struct with function/method
On Sunday, 8 April 2018 at 15:04:49 UTC, number wrote:
the write() shows a 'null' if the struct has a function/method.
why is that?
```
import std.stdio;
void main()
{
struct S
{
int i;
}
S s;
writeln(s);// S(0)
writeln(typeid(s).sizeof); // 8
struct S2
{
int i;
this(this){}
}
S2 s2;
import std.conv: to;
writeln(s2);// S2(0, null)
writeln(typeid(s2).sizeof); // 8
}
```
S2 is a nested struct [1], which means it has a hidden pointer
field that's used to access its enclosing scope. If you change
the definition to `static struct S2`, you'll get the same output
for both structs.
[1] https://dlang.org/spec/struct.html#nested
Re: SMTP Mail
On Friday, 25 August 2017 at 02:13:42 UTC, Adam D. Ruppe wrote:
On Tuesday, 22 August 2017 at 12:52:24 UTC, Vino.B wrote:
Request your help on sending Mails, I am able to receive
mails with empty body the line "smtp.message ="Example
Message" doesn't seem to be working and also please let me
know how do i send a file as a attachment in a email.
The message there needs to be the complete message, including
headers. The SMTP struct is pretty low-level.
My email.d (plus its dependencies, characterencodings.d, dom.d,
and htmltotext.d) has the code to form a full message. It isn't
very documented though.
https://github.com/adamdruppe/arsd
auto message = new EmailMessage();
message.to ~= "some@email";
message.subject = "Subject"
message.setTextBody("hi");
message.send(RelayInfo("smtp://whatever", "user", "pass"));
Hi Adam,
I am trying your email.d programming, and i am getting the
below errors, can you please help me, i just used these programs
(characterencodings.d, color.d, dom.d, htmltotext.d, email.d)
Program
import arsd.email;
void main() {
auto message = new EmailMessage();
message.to ~= "v...@xxx.com";
message.subject = "Test";
message.setHtmlBody("1.Line 12.Line 23.Line
3");
message.addAttachment("text/txt", "C:\\Temp\\test.log", "Text");
message.send(RelayInfo("smtp://smtp..com"));
}
Error
OPTLINK (R) for Win32 Release 8.00.17
Copyright (C) Digital Mars 1989-2013 All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
C:\Users\-TSK-X~1\AppData\Local\Temp\6\.rdmd\rdmd-dmail.d-4C543ACF04BF46D1398435D9500B3B70\objs\dmai
l.exe.obj(dmail.exe)
Error 42: Symbol Undefined
__D6object__T14__switch_errorZQrFNaNbNiNfAyakZv
C:\Users\-TSK-X~1\AppData\Local\Temp\6\.rdmd\rdmd-dmail.d-4C543ACF04BF46D1398435D9500B3B70\objs\dmai
l.exe.obj(dmail.exe)
Error 42: Symbol Undefined
__D4arsd10htmltotext10htmlToTextFAyabiZQg
C:\Users\-TSK-X~1\AppData\Local\Temp\6\.rdmd\rdmd-dmail.d-4C543ACF04BF46D1398435D9500B3B70\objs\dmai
l.exe.obj(dmail.exe)
Error 42: Symbol Undefined __D4arsd10htmltotext12__ModuleInfoZ
Error: linker exited with status 3
From,
Vino.B
Re: std.datetime.systime: days Deprecation message
On Saturday, 7 April 2018 at 18:12:00 UTC, Alex wrote:
On Saturday, 7 April 2018 at 17:25:07 UTC, Vino wrote:
Hi All,
Request your help on the below Deprecation message.
import std.datetime.systime: Clock, days, SysTime;
void main (int AgeSize) {
int AgeSize = 1
auto ct2 = Clock.currTime(), st2 = ct2 + days(-AgeSize);
}
test.d(30): Deprecation: Symbol core.time.days is not visible
from module test.d because it is privately imported in module
systime
From,
Vino.B
As far as I understand it, days are located in core.time.
import core.time : days;
Hi Alex,
Thank you, that resolved the issue.
From,
Vino.B
toString contains null for struct with function/method
the write() shows a 'null' if the struct has a function/method.
why is that?
```
import std.stdio;
void main()
{
struct S
{
int i;
}
S s;
writeln(s);// S(0)
writeln(typeid(s).sizeof); // 8
struct S2
{
int i;
this(this){}
}
S2 s2;
import std.conv: to;
writeln(s2);// S2(0, null)
writeln(typeid(s2).sizeof); // 8
}
```
Re: HTTP-methods and encoding
On Sunday, 8 April 2018 at 06:51:22 UTC, ikod wrote:
On Saturday, 7 April 2018 at 23:54:21 UTC, Vindex wrote:
On Saturday, 7 April 2018 at 15:58:14 UTC, Seb wrote:
On Saturday, 7 April 2018 at 13:02:39 UTC, Vindex wrote:
There is an error on some sites when using HTTP-methods
(std.net.curl.get, std.net.curl.post):
std.encoding.EncodingException@std/encoding.d(2505):
Unrecognized Encoding: utf8
Is there a beautiful way around it?
For the GET-method I use the download() and readText(). But
for the POST-method I can not come up with an alternative
solution.
That's weird. std.net.curl should be able to handle UTF-8.
What content are you trying to download/post?
Maybe you can open a bug report for it?
In any case, you might want to checkout requests:
https://github.com/ikod/dlang-requests
It's by far more convenient to use than std.net.curl
The problem is that "utf-8" (or "UTF-8") is required instead
of "utf8".
I tried to get HTML and JSON. For example, this GET-query
returns error:
"https://yobit.net/api/3/ticker/btc_usd;
Thank you for the advice
Hello,
"utf-8" (or "UTF-8") is required instead of "utf8" - explain,
please.
Anyway this code works as expected:
import requests;
import std.stdio;
import std.format;
void main() {
auto rq = Request();
auto rs = rq.get("https://yobit.net/api/3/ticker/btc_usd;);
writeln(rs.responseBody);
}
output:
{"btc_usd":{"high":7216.09463851,"low":6950,"avg":7083.04731925,"vol":753989.73116823,"vol_cur":105.94453165,"last":7114,"buy":7114.,"sell":7135.1911,"updated":1523170067}}
Thank you, I will use requests.
Function _decodeContent() in curl.d consists:
if (encoding == "UTF-8") return cast(char[])(content);
auto scheme = EncodingScheme.create(encoding);
enforce!CurlException(scheme !is null, format("Unknown encoding
'%s'", encoding));
Encoding name (in std.encoding) is transferred to the lower case
and matches are checked among the supported encoding names. There
is "utf-8", but there is no "utf8" (without the hyphen).
Re: Benchmarking sigmoid function between C and D
On Sunday, 8 April 2018 at 05:35:10 UTC, Arun Chandrasekaran wrote: Did you also generate the bar graph plot using D? Heh nope, I used LibreOffice Calc for that.
Re: HTTP-methods and encoding
On Saturday, 7 April 2018 at 23:54:21 UTC, Vindex wrote:
On Saturday, 7 April 2018 at 15:58:14 UTC, Seb wrote:
On Saturday, 7 April 2018 at 13:02:39 UTC, Vindex wrote:
There is an error on some sites when using HTTP-methods
(std.net.curl.get, std.net.curl.post):
std.encoding.EncodingException@std/encoding.d(2505):
Unrecognized Encoding: utf8
Is there a beautiful way around it?
For the GET-method I use the download() and readText(). But
for the POST-method I can not come up with an alternative
solution.
That's weird. std.net.curl should be able to handle UTF-8.
What content are you trying to download/post?
Maybe you can open a bug report for it?
In any case, you might want to checkout requests:
https://github.com/ikod/dlang-requests
It's by far more convenient to use than std.net.curl
The problem is that "utf-8" (or "UTF-8") is required instead of
"utf8".
I tried to get HTML and JSON. For example, this GET-query
returns error:
"https://yobit.net/api/3/ticker/btc_usd;
Thank you for the advice
Hello,
"utf-8" (or "UTF-8") is required instead of "utf8" - explain,
please.
Anyway this code works as expected:
import requests;
import std.stdio;
import std.format;
void main() {
auto rq = Request();
auto rs = rq.get("https://yobit.net/api/3/ticker/btc_usd;);
writeln(rs.responseBody);
}
output:
{"btc_usd":{"high":7216.09463851,"low":6950,"avg":7083.04731925,"vol":753989.73116823,"vol_cur":105.94453165,"last":7114,"buy":7114.,"sell":7135.1911,"updated":1523170067}}
