Re: Static CT Factory
On Friday, 19 August 2016 at 02:54:48 UTC, Basile B. wrote:
On Friday, 19 August 2016 at 01:53:22 UTC, Engine Machine wrote:
On Friday, 19 August 2016 at 01:25:10 UTC, Anonymouse wrote:
On Friday, 19 August 2016 at 01:10:42 UTC, Engine Machine
x = 1.234;
Ok, well, I guess the error comes from something else.
*x = 1.234 for when T verifies is(T == int*) produces an error.
You can put an aditional argument in the function header:
void foo(T)(auto ref T t = T.init)
{
static if (is(T == int))
auto x = new Thing!int;
else static if (is(T == double))
auto x = new Thing!double;
else
static assert(false, "incorrect type");
*x = t;
}
It was because I had a added a new type that I didn't account for
in the static if chain ;/ The static assert is sort of required.
We sort of need a static switch with required default so
forgetting this stuff doesn't break later on(in strange ways)
when new types are added.
Re: Static CT Factory
On Friday, 19 August 2016 at 01:53:22 UTC, Engine Machine wrote:
On Friday, 19 August 2016 at 01:25:10 UTC, Anonymouse wrote:
On Friday, 19 August 2016 at 01:10:42 UTC, Engine Machine
x = 1.234;
Ok, well, I guess the error comes from something else.
*x = 1.234 for when T verifies is(T == int*) produces an error.
You can put an aditional argument in the function header:
void foo(T)(auto ref T t = T.init)
{
static if (is(T == int))
auto x = new Thing!int;
else static if (is(T == double))
auto x = new Thing!double;
else
static assert(false, "incorrect type");
*x = t;
}
Re: Static CT Factory
On Friday, 19 August 2016 at 01:18:28 UTC, Adam D. Ruppe wrote: On Friday, 19 August 2016 at 01:10:42 UTC, Engine Machine wrote: I feel that in this case I feel that the scope of the static if should allow things to escape since, well, they are static if's. They do. What, exactly, did you do and what, exactly did you see as the error? I get undefined identifier, but when create the variable outside it works. I used Anonymouse code and it works so I guess the issue stems from something else. My code is more complex and the stuff is in a foreach. I don't know why it isn't working since the simplified code is nearly identical. Maybe a branch wasn't being taken, I thought I covered them all.
Re: Static CT Factory
On Friday, 19 August 2016 at 01:25:10 UTC, Anonymouse wrote:
On Friday, 19 August 2016 at 01:10:42 UTC, Engine Machine wrote:
I have a template that is suppose to create a type based on a
template parameter
static if (T == "int")
{
auto x = New!int();
}
else static if (T == "double")
{
auto x = New!double();
}
x = 1.234;
This is just an example, I use custom types.
The static if's prevent x's scope from being after them, even
though it should work perfectly fine. I can't declare x before
because I don't know the type.
I'm not sure I understand. static if shouldn't introduce a new
scope that way.
https://dpaste.dzfl.pl/7b63a6e52309
Mind that x might be a pointer.
Ok, well, I guess the error comes from something else.
Re: Static CT Factory
On Friday, 19 August 2016 at 01:10:42 UTC, Engine Machine wrote:
I have a template that is suppose to create a type based on a
template parameter
static if (T == "int")
{
auto x = New!int();
}
else static if (T == "double")
{
auto x = New!double();
}
x = 1.234;
This is just an example, I use custom types.
The static if's prevent x's scope from being after them, even
though it should work perfectly fine. I can't declare x before
because I don't know the type.
I'm not sure I understand. static if shouldn't introduce a new
scope that way.
https://dpaste.dzfl.pl/7b63a6e52309
Mind that x might be a pointer.
Static CT Factory
I have a template that is suppose to create a type based on a
template parameter
static if (T == "int")
{
auto x = New!int();
}
else static if (T == "double")
{
auto x = New!double();
}
x = 1.234;
This is just an example, I use custom types.
The static if's prevent x's scope from being after them, even
though it should work perfectly fine. I can't declare x before
because I don't know the type.
The point is that I don't want to have to put x = 1.234; in each
static if block when I should be able to do it perfectly fine
afterwards.
My types that I'm creating all have a name field and I want to
set it once after the object is created.
Luckily, all of them inherit from the same type and I can declare
that before the static if block, but in general, that won't work.
I feel that in this case I feel that the scope of the static if
should allow things to escape since, well, they are static if's.
It would be similar to #ifdef.
I realize that D doesn't work this way, I'm asking for a nicer
solution than having to duplicate the same code(x = 1.234 in this
example) or having use a base class.
Re: RSA library
On Thursday, 18 August 2016 at 14:29:54 UTC, Adam D. Ruppe wrote: On Thursday, 18 August 2016 at 09:00:58 UTC, Andre Pany wrote: Is there a D library which can be built with a plain x86 DMD and without dll dependencies? Not that I know of, and I don't think the win32 api includes rsa256 (though .net does!). The botan lib though, why doesn't it work on 32 bit optlink? You might be able to hack it by just taking the algorithms you need and compiling yourself. It is a statement from the botan github readme, maybe due to a dependency. I will try the windows api, from the description it seems exactly what i need. I will also check wheter the specific botan part could be extracted. Thanks a lot. Kind regards Andre
Re: compile error while use `extern(C++, class)`
On Thursday, 18 August 2016 at 16:19:41 UTC, Johan Engelen wrote: On Thursday, 18 August 2016 at 11:43:03 UTC, Lodovico Giaretta wrote: Which compiler version are you using? On DMD 2.071.0 this does not work. Note: this does work with LDC 1.1.0 even though it is based on DMD 2.071. https://github.com/ldc-developers/ldc/releases/tag/v1.1.0-beta2 Well, LDC 1.1.0 is based on DMD 2.071.1, while I tested the above code on asm.dlang.org with DMD 2.071.0, so maybe on DMD 2.071.1 it works too. On nightly it works for sure. So again nothing wrong here, just a matter of having the most recent compiler version.
Re: compile error while use `extern(C++, class)`
On Thursday, 18 August 2016 at 11:43:03 UTC, Lodovico Giaretta
wrote:
On Thursday, 18 August 2016 at 11:11:10 UTC, mogu wrote:
Compiler Error exactly. The minimal code is(dmd or ldc2 in
ubuntu 16.04 lts):
```
extern (C++, struct)
class A {}
```
Error: identifier expected for C++ namespace found 'struct'
when expecting ')' declaration expected, not ')'
Which compiler version are you using? On DMD 2.071.0 this does
not work.
Note: this does work with LDC 1.1.0 even though it is based on
DMD 2.071.
https://github.com/ldc-developers/ldc/releases/tag/v1.1.0-beta2
Re: RSA library
Well, windows api has RSA https://msdn.microsoft.com/en-us/library/windows/desktop/aa375534%28v=vs.85%29.aspx is it different from RSA256?
Re: RSA library
On Thursday, 18 August 2016 at 09:00:58 UTC, Andre Pany wrote: Is there a D library which can be built with a plain x86 DMD and without dll dependencies? Not that I know of, and I don't think the win32 api includes rsa256 (though .net does!). The botan lib though, why doesn't it work on 32 bit optlink? You might be able to hack it by just taking the algorithms you need and compiling yourself.
Re: compile error while use `extern(C++, class)`
On Thursday, 18 August 2016 at 11:43:03 UTC, Lodovico Giaretta
wrote:
On Thursday, 18 August 2016 at 11:11:10 UTC, mogu wrote:
On Thursday, 18 August 2016 at 10:45:14 UTC, Lodovico Giaretta
wrote:
Which kind of error? An error message by the compiler? One by
the linker? The compiler crashes?
Compiler Error exactly. The minimal code is(dmd or ldc2 in
ubuntu 16.04 lts):
```
extern (C++, struct)
class A {}
```
Error: identifier expected for C++ namespace found 'struct'
when expecting ')' declaration expected, not ')'
Which compiler version are you using? On DMD 2.071.0 this does
not work. On nightly build it compiles without errors. So
probably it is a feature that is present, but didn't ship yet.
I suggest you download the latest beta or a nightly build from
the site.
Wouldn't this be more syntactically consistent if it were "Cpp"
instead of "C++"?
Re: compile error while use `extern(C++, class)`
On Thursday, 18 August 2016 at 11:11:10 UTC, mogu wrote:
On Thursday, 18 August 2016 at 10:45:14 UTC, Lodovico Giaretta
wrote:
Which kind of error? An error message by the compiler? One by
the linker? The compiler crashes?
Compiler Error exactly. The minimal code is(dmd or ldc2 in
ubuntu 16.04 lts):
```
extern (C++, struct)
class A {}
```
Error: identifier expected for C++ namespace found 'struct'
when expecting ')' declaration expected, not ')'
Which compiler version are you using? On DMD 2.071.0 this does
not work. On nightly build it compiles without errors. So
probably it is a feature that is present, but didn't ship yet. I
suggest you download the latest beta or a nightly build from the
site.
Re: compile error while use `extern(C++, class)`
On Thursday, 18 August 2016 at 10:45:14 UTC, Lodovico Giaretta
wrote:
Which kind of error? An error message by the compiler? One by
the linker? The compiler crashes?
Compiler Error exactly. The minimal code is(dmd or ldc2 in ubuntu
16.04 lts):
```
extern (C++, struct)
class A {}
```
Error: identifier expected for C++ namespace found 'struct' when
expecting ')' declaration expected, not ')'
