On 8/15/21 2:10 AM, rempas wrote:
So when I'm doing something like the following: `string name = "John";`
Then what's the actual type of the literal `"John"`?
In the chapter [Calling C
functions](https://dlang.org/spec/interfaceToC.html#calling_c_functions)
in the "Interfacing with C" page,
Lot's of great information and pointers already. I will try from another
angle. :)
On 8/14/21 11:10 PM, rempas wrote:
> So when I'm doing something like the following: `string name = "John";`
> Then what's the actual type of the literal `"John"`?
As you say and as the code shows, there are
On Sunday, 15 August 2021 at 09:06:14 UTC, Mike Parker wrote:
The D `string` is an alias for `immutable(char)[]`, immutable
contents of a mutable array reference (`immutable(char[])`
would mean the array reference is also immutable). You don't
want to assign that to a `char*`, because then
On Sunday, 15 August 2021 at 08:11:39 UTC, rempas wrote:
I mean that in C, we can assign a string literal into a `char*`
and also a `const char*` type without getting a compilation
error while in D, we can only assign it to a `const char*`
type. I suppose that's because of C doing explicit
On Sunday, 15 August 2021 at 09:01:17 UTC, jfondren wrote:
They don't do the same thing. toStringz always copies, always
GC-allocates, and always NUL-terminates. `cast(char*)` only
does what you want in the case that you're applying it a string
literal. But in that case you shouldn't cast, you
On Sunday, 15 August 2021 at 08:56:07 UTC, rempas wrote:
On Sunday, 15 August 2021 at 08:53:50 UTC, Tejas wrote:
External C libraries expect strings to be null terminated, so
if you do use `.dup`, use `.toStringz` as well.
Yeah, yeah I got that. My question is, if I should avoid
On Sunday, 15 August 2021 at 08:53:50 UTC, Tejas wrote:
External C libraries expect strings to be null terminated, so
if you do use `.dup`, use `.toStringz` as well.
Yeah, yeah I got that. My question is, if I should avoid
`cast(char*)` and use `.toStringz` while both do the exact same
On Sunday, 15 August 2021 at 08:51:19 UTC, rempas wrote:
On Sunday, 15 August 2021 at 08:47:39 UTC, jfondren wrote:
dup() isn't aware of the NUL since that's outside the slice of
the string. It only copies the chars in "John". You can use
toStringz to ensure NUL termination:
On Sunday, 15 August 2021 at 08:47:39 UTC, jfondren wrote:
dup() isn't aware of the NUL since that's outside the slice of
the string. It only copies the chars in "John". You can use
toStringz to ensure NUL termination:
https://dlang.org/phobos/std_string.html#.toStringz
Is there something
On Sunday, 15 August 2021 at 08:11:39 UTC, rempas wrote:
On Sunday, 15 August 2021 at 07:43:59 UTC, jfondren wrote:
```d
unittest {
char* s = "John".dup.ptr;
s[0] = 'X'; // no segfaults
assert(s[0..4] == "Xohn"); // ok
}
```
Well, that one didn't worked out really well for me.
On Sunday, 15 August 2021 at 07:47:27 UTC, jfondren wrote:
On Sunday, 15 August 2021 at 07:43:59 UTC, jfondren wrote:
On Sunday, 15 August 2021 at 06:10:53 UTC, rempas wrote:
```d
unittest {
char* s = "John".dup.ptr;
s[0] = 'X'; // no segfaults
assert(s[0..4] == "Xohn"); // ok
}
```
On Sunday, 15 August 2021 at 08:17:47 UTC, rikki cattermole wrote:
pragma is a set of commands to the compiler that may be
compiler specific.
In the case of the msg command, it tells the compiler to output
a message to stdout during compilation.
Thanks man!
On 15/08/2021 8:11 PM, rempas wrote:
Still don't know what "pragma" does but thank you.
pragma is a set of commands to the compiler that may be compiler specific.
In the case of the msg command, it tells the compiler to output a
message to stdout during compilation.
On Sunday, 15 August 2021 at 07:43:59 UTC, jfondren wrote:
```d
unittest {
pragma(msg, typeof("John")); // string
pragma(msg, is(typeof("John") == immutable(char)[])); //
true
}
```
Still don't know what "pragma" does but thank you.
```d
void zerort(string s) {
On Sunday, 15 August 2021 at 07:43:59 UTC, jfondren wrote:
On Sunday, 15 August 2021 at 06:10:53 UTC, rempas wrote:
```d
unittest {
char* s = "John".dup.ptr;
s[0] = 'X'; // no segfaults
assert(s[0..4] == "Xohn"); // ok
}
```
So am I going to have an extra runtime cost having to
On Sunday, 15 August 2021 at 06:10:53 UTC, rempas wrote:
So when I'm doing something like the following: `string name =
"John";`
Then what's the actual type of the literal `"John"`?
```d
unittest {
pragma(msg, typeof("John")); // string
pragma(msg, is(typeof("John") ==
16 matches
Mail list logo
