Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Tuesday, 17 October 2023 at 13:31:39 UTC, Salih Dincer wrote: On Sunday, 15 October 2023 at 07:22:53 UTC, Imperatorn wrote: You already got a lot of good answers, I thought I'd just share this for anyone searching for nogc string formatting compatible with betterC: https://code.dlang.org/packages/bc-string Doesn't it make more sense to use [ParseResult!T parse(T)(cstring str)](https://github.com/tchaloupka/bc-string/blob/master/source/bc/string/conv.d) instead of nested if's here: https://github.com/tchaloupka/bc-string/blob/master/source/bc/string/numeric.d Thanks, SDB@79 Omg, yeah, that looks like some kind of hack. Make a PR :)
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Sunday, 15 October 2023 at 07:22:53 UTC, Imperatorn wrote: You already got a lot of good answers, I thought I'd just share this for anyone searching for nogc string formatting compatible with betterC: https://code.dlang.org/packages/bc-string Doesn't it make more sense to use [ParseResult!T parse(T)(cstring str)](https://github.com/tchaloupka/bc-string/blob/master/source/bc/string/conv.d) instead of nested if's here: https://github.com/tchaloupka/bc-string/blob/master/source/bc/string/numeric.d Thanks, SDB@79
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Sunday, 15 October 2023 at 07:22:53 UTC, Imperatorn wrote: You already got a lot of good answers, I thought I'd just share this for anyone searching for nogc string formatting compatible with betterC: https://code.dlang.org/packages/bc-string You thought, well, thank you very much and have a great day!
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Saturday, 14 October 2023 at 06:48:40 UTC, rempas wrote:
On Friday, 13 October 2023 at 10:11:33 UTC, Nick Treleaven
wrote:
You can also do it using a string mixin:
mixin(create_fn!(mixin("`", i, "`")));
I think that's equivalent to `i.stringof` anyway.
Thank you for the info!
You already got a lot of good answers, I thought I'd just share
this for anyone searching for nogc string formatting compatible
with betterC:
https://code.dlang.org/packages/bc-string
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Friday, 13 October 2023 at 10:11:33 UTC, Nick Treleaven wrote:
You can also do it using a string mixin:
mixin(create_fn!(mixin("`", i, "`")));
I think that's equivalent to `i.stringof` anyway.
Thank you for the info!
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Tuesday, 10 October 2023 at 16:11:57 UTC, bachmeier wrote: Which part uses Phobos? The linked function compiles without importing anything. Actually, you are right. I didn't give a lot of thought to it, as there is the line `char[] ret = new char[](length);` but I can replace it with an external buffer. Anyway, I'm not trying to do that anymore, and I will also create my own `int_to_string` method in the future but thanks for pointing it out!
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Tuesday, 10 October 2023 at 11:45:25 UTC, Dennis wrote:
```D
enum itoa(int i) = i.stringof;
static foreach(i; 0 .. 10) {
mixin(create_fn!(itoa!i));
}
```
You can also do it using a string mixin:
mixin(create_fn!(mixin("`", i, "`")));
I think that's equivalent to `i.stringof` anyway.
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Tuesday, 10 October 2023 at 13:55:44 UTC, rempas wrote: On Tuesday, 10 October 2023 at 11:46:38 UTC, Hipreme wrote: My engine has its own implementation of toString(long), which does not have dependency with the C runtime: https://github.com/MrcSnm/HipremeEngine/blob/master/modules/util/source/hip/util/conv.d#L180C1-L208C2 I have reimplemented the entire conv module since it is one of mostly used module and it pulled down a lot of things, so, with my util module I was able to make my program much smaller too. Thank you for the idea! However, your code used Phobos which I don't want to use so it will not do. Which part uses Phobos? The linked function compiles without importing anything.
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Tuesday, 10 October 2023 at 11:46:38 UTC, Hipreme wrote: My engine has its own implementation of toString(long), which does not have dependency with the C runtime: https://github.com/MrcSnm/HipremeEngine/blob/master/modules/util/source/hip/util/conv.d#L180C1-L208C2 I have reimplemented the entire conv module since it is one of mostly used module and it pulled down a lot of things, so, with my util module I was able to make my program much smaller too. Thank you for the idea! However, your code used Phobos which I don't want to use so it will not do.
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Tuesday, 10 October 2023 at 11:45:25 UTC, Dennis wrote:
The result of `.stringof` is implementation defined, it can be
used for debugging but don't make your program's semantics
depend on the output of it.
...
...
...That being said, this trick can be used to convert an
integer to string at compile time:
```D
enum itoa(int i) = i.stringof;
static foreach(i; 0 .. 10) {
mixin(create_fn!(itoa!i));
}
```
Technically not reliable, but I don't expect integers to ever
get printed differently than a string of base 10 digits.
Thank you! It is great and works great. I will however use the
example from Imperatorn as it does not use ".stringof". Have an
amazing day!
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Tuesday, 10 October 2023 at 05:32:52 UTC, Imperatorn wrote:
If count < 10 then why not just
```d
import std;
static foreach(c; "0123456789")
{
mixin(create_fn!(c));
}
enum create_fn(char num) = `
auto function_`~ num ~`()
=> "Hello from function `~ num ~`!";
`;
void main()
{
assert(function_9() == "Hello from function 9!");
}
```
Thank you! Yeah, the most clean code wins for me, so I'll use
yours (if it's open source, lol)! Thank you and have an amazing
day!
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 22:49:11 UTC, Salih Dincer wrote:
Great masters generally warn to stay away from stringof. Please
do not use it as much as possible. The following code snippet
will be useful to you:
```d
alias CN = __traits(allMembers, CardinalNumbers);
static foreach(i; CN)
{
mixin(create_fn!(i[1]));
}
enum create_fn(char num) = `
auto function_`~ num ~`()
=> "Hello from function `~ num ~`!";
`;
enum CardinalNumbers
{
n0, n1, n2, n3, n4, n5, n6, n7, n8, n9
}
void main()
{
assert(function_9() == "Hello from function 9!");
}
```
SDB@79
Thank you so much! This will do the trick. Have a beautiful day!
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 18:25:15 UTC, rempas wrote: On Monday, 9 October 2023 at 17:42:48 UTC, Imperatorn wrote: You could just add your own int to string I guess? That will be a good idea! I'll do it in the future if that is the case, as it's not important, and I want to finish my job. Thank you and have a great day! My engine has its own implementation of toString(long), which does not have dependency with the C runtime: https://github.com/MrcSnm/HipremeEngine/blob/master/modules/util/source/hip/util/conv.d#L180C1-L208C2 I have reimplemented the entire conv module since it is one of mostly used module and it pulled down a lot of things, so, with my util module I was able to make my program much smaller too.
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 16:33:32 UTC, rempas wrote:
However, in my example, "stringof" returns the character "i"
itself and turns that into a string instead of getting its
actual value (number).
The result of `.stringof` is implementation defined, it can be
used for debugging but don't make your program's semantics depend
on the output of it.
...
...
...That being said, this trick can be used to convert an integer
to string at compile time:
```D
enum itoa(int i) = i.stringof;
static foreach(i; 0 .. 10) {
mixin(create_fn!(itoa!i));
}
```
Technically not reliable, but I don't expect integers to ever get
printed differently than a string of base 10 digits.
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 22:49:11 UTC, Salih Dincer wrote:
On Monday, 9 October 2023 at 16:33:32 UTC, rempas wrote:
I'm trying to create a series of function. There will be ten
of them, and they will be called `function_0`, `function_1`,
etc. However, in my example, "stringof" returns the character
"i" itself and turns that into a string instead of getting its
actual value (number).
Any ideas how I can achieve what I'm trying to achieve?
Great masters generally warn to stay away from stringof. Please
do not use it as much as possible. The following code snippet
will be useful to you:
```d
alias CN = __traits(allMembers, CardinalNumbers);
static foreach(i; CN)
{
mixin(create_fn!(i[1]));
}
enum create_fn(char num) = `
auto function_`~ num ~`()
=> "Hello from function `~ num ~`!";
`;
enum CardinalNumbers
{
n0, n1, n2, n3, n4, n5, n6, n7, n8, n9
}
void main()
{
assert(function_9() == "Hello from function 9!");
}
```
SDB@79
If count < 10 then why not just
```d
import std;
static foreach(c; "0123456789")
{
mixin(create_fn!(c));
}
enum create_fn(char num) = `
auto function_`~ num ~`()
=> "Hello from function `~ num ~`!";
`;
void main()
{
assert(function_9() == "Hello from function 9!");
}
```
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 16:33:32 UTC, rempas wrote:
I'm trying to create a series of function. There will be ten of
them, and they will be called `function_0`, `function_1`, etc.
However, in my example, "stringof" returns the character "i"
itself and turns that into a string instead of getting its
actual value (number).
Any ideas how I can achieve what I'm trying to achieve?
Great masters generally warn to stay away from stringof. Please
do not use it as much as possible. The following code snippet
will be useful to you:
```d
alias CN = __traits(allMembers, CardinalNumbers);
static foreach(i; CN)
{
mixin(create_fn!(i[1]));
}
enum create_fn(char num) = `
auto function_`~ num ~`()
=> "Hello from function `~ num ~`!";
`;
enum CardinalNumbers
{
n0, n1, n2, n3, n4, n5, n6, n7, n8, n9
}
void main()
{
assert(function_9() == "Hello from function 9!");
}
```
SDB@79
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 17:52:58 UTC, Jonathan M Davis wrote: The closest to a built-in solution would be toString on classes and structs, but structs don't necessarily have a toString. Rather, in many cases, Phobos does introspection on the struct to figure out how to convert the struct's members to a string if no toString is present (which isn't necessarily pretty but generally works well for debug output). Anyone looking to be able to do that sort of thing without Phobos is either going to need to reimplement what Phobos does themselves or use a third party library that already does that. [...] Thank you for the info. Unfortunately, while my project uses libc, I try to get rid of it as well, so it will also not do. I may create a function in the future myself. Thanks a lot for your time and I hope you have a beautiful day!
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 17:42:48 UTC, Imperatorn wrote: You could just add your own int to string I guess? That will be a good idea! I'll do it in the future if that is the case, as it's not important, and I want to finish my job. Thank you and have a great day!
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, October 9, 2023 10:55:41 AM MDT rempas via Digitalmars-d-learn wrote: > On Monday, 9 October 2023 at 16:53:55 UTC, mw wrote: > > but you `import std.stdio;`? > > > > Or copy the std/conv.d over to your build, > > > > or copy / write a toString(int) function yourself, which is > > compile-time callable. > > I do on that example just to use "write". It wouldn't be > necessary, but I just included it. My normal project does not use > Phobos. The language does not have a way to convert variables to strings. The normal solution for that is to use Phobos. The closest to a built-in solution would be toString on classes and structs, but structs don't necessarily have a toString. Rather, in many cases, Phobos does introspection on the struct to figure out how to convert the struct's members to a string if no toString is present (which isn't necessarily pretty but generally works well for debug output). Anyone looking to be able to do that sort of thing without Phobos is either going to need to reimplement what Phobos does themselves or use a third party library that already does that. std.conv.to provides the ability to convert between types in general based on their constructors, opCast member functions, and toString (if the user-defined type has one). So, it's able to convert pretty much any type to a string using to!string. std.format.format is then D's equivalent to snprintf, and it's able to convert pretty much any type to a string. I'm not sure if it uses to!string internally though. Regardless, if you want to be able to convert an arbitrary variable to a string without using Phobos, you basically have to reimplement all of that yourself (or at least as much as you need to do whatever it is that you're doing). C functions like snprintf can be used to convert the primitive types (meaning that you wouldn't have to implement something like the mess that is converting floating points to string), but for user-defined types that don't have toString, you'd basically be forced to do the kind of type introspection that Phobos does to produce a string from each of the member variables. It's possible that there's library somewhere that doesn't rely on Phobos that provides some of the same functionality (e.g. for the guys looking to use -betterC as a long term solution rather than just as a porting tool), but the language itself doesn't have that kind of functionality. Now, if what you're looking to do is to specifically convert an integer to a string at compile time (which means that snprintf wouldn't be a solution, since you can't call C functions during CTFE) rather than converting variables in general to string, then it shouldn't be hard to write a simple function that converts from an integer to a string. So, if that's all that you're looking to do, it shouldn't be hard to avoid Phobos. However, you're still going to need to implement it yourself. - Jonathan M Davis
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 16:55:41 UTC, rempas wrote: On Monday, 9 October 2023 at 16:53:55 UTC, mw wrote: but you `import std.stdio;`? Or copy the std/conv.d over to your build, or copy / write a toString(int) function yourself, which is compile-time callable. I do on that example just to use "write". It wouldn't be necessary, but I just included it. My normal project does not use Phobos. You could just add your own int to string I guess?
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 16:53:55 UTC, mw wrote: but you `import std.stdio;`? Or copy the std/conv.d over to your build, or copy / write a toString(int) function yourself, which is compile-time callable. I do on that example just to use "write". It wouldn't be necessary, but I just included it. My normal project does not use Phobos.
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 16:51:31 UTC, rempas wrote: On Monday, 9 October 2023 at 16:42:38 UTC, mw wrote: use: import std.conv; [...] Damn, sorry, forgot to mention. I cannot use Phobos. but you `import std.stdio;`? Or copy the std/conv.d over to your build, or copy / write a toString(int) function yourself, which is compile-time callable.
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
On Monday, 9 October 2023 at 16:42:38 UTC, mw wrote: use: import std.conv; [...] Damn, sorry, forgot to mention. I cannot use Phobos.
Re: How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
use:
import std.conv;
... i.to!string ...
```
import std.stdio;
import std.conv;
static foreach(i; 0 .. 10) {
mixin(create_fn!(i.to!string));
}
enum create_fn(string num) = `
void function_`~ num ~`() { writeln("Hello from function `~ num
~`!"); }
`;
void main() {
function_9();
}
```
$ dmd -c gen_fun_i.d
$ nm gen_fun_i.o | grep function_
W _D9gen_fun_i10function_0FZv
W _D9gen_fun_i10function_1FZv
W _D9gen_fun_i10function_2FZv
W _D9gen_fun_i10function_3FZv
W _D9gen_fun_i10function_4FZv
W _D9gen_fun_i10function_5FZv
W _D9gen_fun_i10function_6FZv
W _D9gen_fun_i10function_7FZv
W _D9gen_fun_i10function_8FZv
W _D9gen_fun_i10function_9FZv
$ dmd gen_fun_i.d
$ ./gen_fun_i
Hello from function 9!
On Monday, 9 October 2023 at 16:33:32 UTC, rempas wrote:
Let's see the following example:
```d
import std.stdio;
static foreach(i; 0 .. 10) {
mixin(create_fn!(i.stringof));
}
enum create_fn(string num) = `
void function_`~ num ~`() { writeln("Hello from function `~
num ~`!"); }
`;
void main() {
function10();
}
```
I'm trying to create a series of function. There will be ten of
them, and they will be called `function_0`, `function_1`, etc.
However, in my example, "stringof" returns the character "i"
itself and turns that into a string instead of getting its
actual value (number).
Any ideas how I can achieve what I'm trying to achieve?
How to use ".stringof" to get the value of a variable and not the name of the variable (identifier) itself?
Let's see the following example:
```d
import std.stdio;
static foreach(i; 0 .. 10) {
mixin(create_fn!(i.stringof));
}
enum create_fn(string num) = `
void function_`~ num ~`() { writeln("Hello from function `~ num
~`!"); }
`;
void main() {
function10();
}
```
I'm trying to create a series of function. There will be ten of
them, and they will be called `function_0`, `function_1`, etc.
However, in my example, "stringof" returns the character "i"
itself and turns that into a string instead of getting its actual
value (number).
Any ideas how I can achieve what I'm trying to achieve?
