Re: Error: constructor Foo.this default constructor for structs only allowed with @disable, no body, and no parameters
On Monday, 7 March 2016 at 13:23:58 UTC, Nicholas Wilson wrote:
struct Fence
{
VkFence fence;
alias fence this;
static struct CreateInfo
{
VkFenceCreateInfo ci;
alias ci this;
this(
)
{
ci = typeof(ci)(
cast(typeof(ci.sType))StructureType.eFenceCreateInfo,
null,
0);
}
}
}
I'm not quite sure what this error is saying. Is it that the
only struct constructor that can have no parameters is @disable
this(){} ?
If so this is rather annoying as I have to create a new code
path for the generation of this and 7 other structs. What must
the code be in this case?
static struct CreateInfo
{
VkFenceCreateInfo ci =
VkFenceCreateInfo(cast(typeof(ci.sType))StructureType.eFenceCreateInfo,null,0);
alias ci this;
}
?
"Solved" by having a default parameter. Results in a deprecation
but w/e.
Re: Speed up `dub`.
On Monday, 7 March 2016 at 18:58:55 UTC, ciechowoj wrote: dub --version DUB version 0.9.24+161-gb9ce700, built on Feb 23 2016 `dub.json` is `dub.json` of dstep `dub test --skip-registry=all` Do not helps. I try to grab dstep with dub fetch step (dub version 0.9.24, built on Aug 19 2015, on Ubuntu), and try to run dub build step. I can confirm that on my machine takes around 5 seconds to check if the dependencies are update.
Re: Speed up `dub`.
On Monday, 7 March 2016 at 09:18:37 UTC, ciechowoj wrote: I'm using `dub` to build project. And every time I run `dub` it seems to check if dependencies are up to date, which takes some time. Is there a way to switch of that checking? Or any other way to speed up building process? It really slows down my modify-compile-check iteration time. Use ld.gold - it will speed up your linking quite dramatically! https://code.dawg.eu/reducing-vibed-turnaround-time-part-1-faster-linking.html
Re: Speed up `dub`.
On Monday, 7 March 2016 at 19:58:19 UTC, WebFreak001 wrote: On Monday, 7 March 2016 at 18:58:55 UTC, ciechowoj wrote: dub --version DUB version 0.9.24+161-gb9ce700, built on Feb 23 2016 `dub.json` is `dub.json` of dstep `dub test --skip-registry=all` Do not helps. Its because of dub going through all those JSON files. For example just querying the import paths would probably take like 7s in your case. Try "dub describe --import-paths" in your project. Its something you can't do anything against except reporting it to the dub issues Yes but if he wants to build then `--describe` will not help that much !
Re: Speed up `dub`.
On Monday, 7 March 2016 at 18:58:55 UTC, ciechowoj wrote: dub --version DUB version 0.9.24+161-gb9ce700, built on Feb 23 2016 `dub.json` is `dub.json` of dstep `dub test --skip-registry=all` Do not helps. Its because of dub going through all those JSON files. For example just querying the import paths would probably take like 7s in your case. Try "dub describe --import-paths" in your project. Its something you can't do anything against except reporting it to the dub issues
Re: Speed up `dub`.
I would say dub is broken and should be fixed. Even dub run is really slow and try to build everything. So please report a bug: https://github.com/D-Programming-Language/dub/issues Dne 7.3.2016 v 19:58 ciechowoj via Digitalmars-d-learn napsal(a): dub --version DUB version 0.9.24+161-gb9ce700, built on Feb 23 2016 `dub.json` is `dub.json` of dstep `dub test --skip-registry=all` Do not helps.
Re: Speed up `dub`.
dub --version DUB version 0.9.24+161-gb9ce700, built on Feb 23 2016 `dub.json` is `dub.json` of dstep `dub test --skip-registry=all` Do not helps.
Re: Const vs Non const method
On Monday, 7 March 2016 at 18:44:01 UTC, Namespace wrote: Honestly speaking, I think this case is impossible to solve in C++. I'll show my fellow students the advantages of D over C++ in next couple of weeks, and this example is pretty good. :) :-) Good luck!
Re: Const vs Non const method
On Monday, 7 March 2016 at 18:17:18 UTC, Ola Fosheim Grøstad wrote: On Monday, 7 March 2016 at 16:30:48 UTC, Namespace wrote: Thanks to the wildcard modifier inout. Is there any possible way to do the same in C++? In this specific case you could do it with a macro if you don't mind dirty macros, but you really should implement the const version explicitly or use a free function that cover both cases using templating. If you are looking for information on C++ you probably should use stack overflow: http://stackoverflow.com/questions/7792052/c-template-to-cover-const-and-non-const-method Honestly speaking, I think this case is impossible to solve in C++. I'll show my fellow students the advantages of D over C++ in next couple of weeks, and this example is pretty good. :)
Re: Const vs Non const method
On Monday, 7 March 2016 at 16:30:48 UTC, Namespace wrote: Thanks to the wildcard modifier inout. Is there any possible way to do the same in C++? In this specific case you could do it with a macro if you don't mind dirty macros, but you really should implement the const version explicitly or use a free function that cover both cases using templating. If you are looking for information on C++ you probably should use stack overflow: http://stackoverflow.com/questions/7792052/c-template-to-cover-const-and-non-const-method
Re: Const vs Non const method
Let's use an example:
import std.stdio;
class Visitor {
public:
void visit(inout A) {
writeln("visit A");
}
void visit(inout B) {
writeln("visit B");
}
}
class A {
public:
void accept(Visitor v) inout {
v.visit(this);
}
}
class B : A {
public:
override void accept(Visitor v) inout {
v.visit(this);
}
}
This piece of code works for both versions below:
#1:
void main() {
A a = new A();
A b = new B();
Visitor v = new Visitor();
a.accept(v);
b.accept(v);
}
#2:
void main() {
const A a = new A();
const A b = new B();
Visitor v = new Visitor();
a.accept(v);
b.accept(v);
}
Thanks to the wildcard modifier inout. Is there any possible way
to do the same in C++?
Re: Is it safe to use 'is' to compare types?
On 3/4/16 4:30 PM, Yuxuan Shui wrote: On Friday, 4 March 2016 at 15:18:55 UTC, Steven Schveighoffer wrote: On 3/3/16 6:58 PM, Yuxuan Shui wrote: On Thursday, 3 March 2016 at 23:51:16 UTC, Adam D. Ruppe wrote: On Thursday, 3 March 2016 at 23:46:50 UTC, Yuxuan Shui wrote: Will typeid(a) is typeid(b) yield different results than typeid(a) == typeid(b)? No. Indeed, opEquals on TypeInfo just calls is itself. But opEquals also has extra comparison: auto ti = cast(const TypeInfo)o; return ti && this.toString() == ti.toString(); This makes me feel they are not the same. In some cases, for instance using DLLs, the TypeInfo for an object allocated in one way may be identical, but be a different instance from the TypeInfo allocated in another way. This is why the string comparison occurs. Note that comparing ANY object will first check if they are the same instance before calling any functions (this is in object.opEquals) Thanks for answering. But I still don't understand why TypeInfo would need to be allocated. Aren't typeid() just returning references to the __DxxTypeInfo___initZ symbol? You misunderstood, I meant the typeinfo *for* an allocated object, not that the typeinfo was allocated. In some cases, 2 different objects allocated from different libraries (usually DLL-land) may reference TypeInfo from different segments, even though the TypeInfo is identical. -Steve
Re: Speed up `dub`.
On Monday, 7 March 2016 at 09:18:37 UTC, ciechowoj wrote: I'm using `dub` to build project. And every time I run `dub` it seems to check if dependencies are up to date, which takes some time. Is there a way to switch of that checking? Or any other way to speed up building process? It really slows down my modify-compile-check iteration time. A few hours ago dub.pm alias code.dlang.org was down or slow, so I used: $> dub --skip-registry=all build might be thats the reason?
Re: Error: constructor Foo.this default constructor for structs only allowed with @disable, no body, and no parameters
On Monday, 7 March 2016 at 13:23:58 UTC, Nicholas Wilson wrote:
I'm not quite sure what this error is saying. Is it that the
only struct constructor that can have no parameters is @disable
this(){} ?
Yes, this is exactly right. You cannot have a structure with a
default constructor, except with @disable.
You can, however, specify the initial values of fields, as in
your second example. Note that you can use typeof on the variable
you are currently declaring.
VkFenceCreateInfo CI =
typeof(CI)(cast(typeof(CI.sType))StructureType.eFenceCreateInfo,
null, 0);
Error: constructor Foo.this default constructor for structs only allowed with @disable, no body, and no parameters
struct Fence
{
VkFence fence;
alias fence this;
static struct CreateInfo
{
VkFenceCreateInfo ci;
alias ci this;
this(
)
{
ci = typeof(ci)(
cast(typeof(ci.sType))StructureType.eFenceCreateInfo,
null,
0);
}
}
}
I'm not quite sure what this error is saying. Is it that the only
struct constructor that can have no parameters is @disable
this(){} ?
If so this is rather annoying as I have to create a new code path
for the generation of this and 7 other structs. What must the
code be in this case?
static struct CreateInfo
{
VkFenceCreateInfo ci =
VkFenceCreateInfo(cast(typeof(ci.sType))StructureType.eFenceCreateInfo,null,0);
alias ci this;
}
?
Re: Determine decimal separator (comma vs point)
On Monday, 7 March 2016 at 12:29:39 UTC, Andre wrote:
Hi,
I execute an external application and get some decimal numbers:
auto p = execute(["curl", "-o", "/dev/null", "-s", "-w",
"%{time_namelookup}:%{time_appconnect}:%{time_redirect}:%{time_starttransfer}:%{time_pretransfer}:%{time_connect}:%{time_total}",
url]);
On my windows system, the decimal separator is "," therefore I
want
to replace the "," with "." to avoid exceptions while
converting the value to!double.
I thought following coding should return "," on my OS because
it is set in the region settings but "." is returned:
import core.stdc.locale;
auto lConv = localeconv();
char decSeparator = *lConv.decimal_point;
How can I determine the correct decimal separator?
Kind regards
André
I just found the answer:
lconv* lc;
setlocale(LC_NUMERIC, "");
lc = localeconv();
writeln(to!string(lc.decimal_point));
Re: Speed up `dub`.
On Monday, 7 March 2016 at 09:18:37 UTC, ciechowoj wrote: I'm using `dub` to build project. And every time I run `dub` it seems to check if dependencies are up to date, which takes some time. Is there a way to switch of that checking? Or any other way to speed up building process? It really slows down my modify-compile-check iteration time. On my case, I don't see taking too long. Could you check what version of dub are you using, and what OS & D compiler and version ? And better, if you can past here your dub.sdl/dub.json .
Determine decimal separator (comma vs point)
Hi,
I execute an external application and get some decimal numbers:
auto p = execute(["curl", "-o", "/dev/null", "-s", "-w",
"%{time_namelookup}:%{time_appconnect}:%{time_redirect}:%{time_starttransfer}:%{time_pretransfer}:%{time_connect}:%{time_total}",
url]);
On my windows system, the decimal separator is "," therefore I
want
to replace the "," with "." to avoid exceptions while converting
the value to!double.
I thought following coding should return "," on my OS because it
is set in the region settings but "." is returned:
import core.stdc.locale;
auto lConv = localeconv();
char decSeparator = *lConv.decimal_point;
How can I determine the correct decimal separator?
Kind regards
André
Re: Const vs Non const method
On Monday, 7 March 2016 at 10:52:53 UTC, Ola Fosheim Grøstad
wrote:
On Sunday, 6 March 2016 at 17:53:47 UTC, Namespace wrote:
What would be the C++ way? Is there any comfortable way to
solve this problem in a nice way like D?
C++ has a non-idiomatic language culture. There are many ways
to do it. One clean way could be to use a templated method,
another way is to use a function object, a dirty way would be
to use a const-cast.
Another thing in C++ is that you can overload members on rvalue
and lvalue references, from
http://en.cppreference.com/w/cpp/language/member_functions :
#include
struct S {
void f() & { std::cout << "lvalue\n"; }
void f() &&{ std::cout << "rvalue\n"; }
};
int main(){
S s;
s.f();// prints "lvalue"
std::move(s).f(); // prints "rvalue"
S().f(); // prints "rvalue"
}
Of course, all of this is just because you don't get to specify
the type of the "this" pointer... So not as clean as it should
be, but that applies to both languages. Adding lots of syntax
with no real semantic benefits.
Re: Const vs Non const method
On Sunday, 6 March 2016 at 17:53:47 UTC, Namespace wrote: What would be the C++ way? Is there any comfortable way to solve this problem in a nice way like D? C++ has a non-idiomatic language culture. There are many ways to do it. One clean way could be to use a templated method, another way is to use a function object, a dirty way would be to use a const-cast.
Re: Speed up `dub`.
On Monday, 7 March 2016 at 09:22:16 UTC, Daniel Kozak wrote: maybe: dub build --nodeps Dne 7.3.2016 v 10:18 ciechowoj via Digitalmars-d-learn napsal(a): I'm using `dub` to build project. And every time I run `dub` it seems to check if dependencies are up to date, which takes some time. Is there a way to switch of that checking? Or any other way to speed up building process? It really slows down my modify-compile-check iteration time. I've tried that one already - it makes no difference. Currently when I run `dub test` it takes about 9s (project is already built). When running the executable directly takes only 0.2s :/.
Re: Speed up `dub`.
maybe: dub build --nodeps Dne 7.3.2016 v 10:18 ciechowoj via Digitalmars-d-learn napsal(a): I'm using `dub` to build project. And every time I run `dub` it seems to check if dependencies are up to date, which takes some time. Is there a way to switch of that checking? Or any other way to speed up building process? It really slows down my modify-compile-check iteration time.
Speed up `dub`.
I'm using `dub` to build project. And every time I run `dub` it seems to check if dependencies are up to date, which takes some time. Is there a way to switch of that checking? Or any other way to speed up building process? It really slows down my modify-compile-check iteration time.
Re: Create Windows "shortcut" (.lnk) with D?
On Sunday, 6 March 2016 at 20:13:39 UTC, 岩倉 澪 wrote: On Sunday, 6 March 2016 at 11:00:35 UTC, John wrote: On Sunday, 6 March 2016 at 03:13:23 UTC, 岩倉 澪 wrote: IShellLinkA* shellLink; IPersistFile* linkFile; Any help would be highly appreciated as I'm new to Windows programming in D and have no idea what I'm doing wrong! In D, interfaces are references, so it should be: IShellLinkA shellLink; IPersistFile linkFile; That's exactly what the problem was, thank you!! You can use official specs to recreate binary file: https://msdn.microsoft.com/en-us/library/dd871305.aspx Ok, not the fastest way. :)
