digitalmars.D.learn - Error: `std.uni.isUpper` conflicts with `std.ascii.isUpper`
- Marcone (5/5) Jul 14 2020 import std: isUpper, writeln;
- Ben Jones (7/12) Jul 14 2020 import std.uni: isUpper; // or import std.ascii : isUpper
- oddp (13/20) Jul 14 2020 Two more options:
- oddp (13/20) Jul 14 2020 Two more options:
- WebFreak001 (32/37) Jul 15 2020 Additionally to the other answers telling you how to fix it, it's
- aberba (3/8) Jul 15 2020 Without reading this very explanation, how would one know whilst
- WebFreak001 (9/19) Jul 15 2020 in that explanation I broadly covered:
import std: isUpper, writeln;
void main(){
writeln(isUpper('A'));
}
Why I get this error? How can I use isUpper()?
Jul 14 2020
Ben Jones <fake fake.fake>
On Tuesday, 14 July 2020 at 20:37:53 UTC, Marcone wrote:
import std: isUpper, writeln;
void main(){
writeln(isUpper('A'));
}
Why I get this error? How can I use isUpper()?
import std.uni: isUpper; // or import std.ascii : isUpper
import std.stdio : writeln;
import std pulls in all the modules in phobos and uni and ascii
both contain functions named isUpper. There's probably many ways
to fix the error, but I usually import the modules I want
explicitly.
Jul 14 2020
On 2020-07-14 22:37, Marcone via Digitalmars-d-learn wrote:
import std: isUpper, writeln;
void main(){
writeln(isUpper('A'));
}
Why I get this error? How can I use isUpper()?
Two more options:
either fully qualify the name:
import std;
void main(){
writeln(std.uni.isUpper('A'));
}
or import locally:
import std;
void main(){
import std.uni;
writeln(isUpper('A'));
}
Jul 14 2020
On 2020-07-14 22:37, Marcone via Digitalmars-d-learn wrote:
import std: isUpper, writeln;
void main(){
writeln(isUpper('A'));
}
Why I get this error? How can I use isUpper()?
Two more options:
either fully qualify the name:
import std;
void main(){
writeln(std.uni.isUpper('A'));
}
or import locally:
import std;
void main(){
import std.uni;
writeln(isUpper('A'));
}
Jul 14 2020
On Tuesday, 14 July 2020 at 20:37:53 UTC, Marcone wrote:
import std: isUpper, writeln;
void main(){
writeln(isUpper('A'));
}
Why I get this error? How can I use isUpper()?
Additionally to the other answers telling you how to fix it, it's
important to know why it happens in the first place:
std.ascii defines an isUpper method which only works on ASCII
characters (byte value < 128), which means it's a really simple
and very fast check, basically the same as `c >= 'A' && c <= 'Z'`
but usually more readable. The other functions in std.ascii work
the same and are all just very convenient methods for these
simple checks. You should only really use this for file formats
and internal strings, never for anything the user could input
(preferably not even for validation of English applications)
std.uni defines an isUpper method as defined in the unicode 6.2
spec (the whole std.uni module is for these standardized unicode
classifications and transformations, but NOT for UTF
encoding/decoding, that's what std.utf is for), which means it
works for a lot more languages than just the basic English
alphabet in ASCII, at the cost of being slower.
If you have a normal import like `import std;` you can specify
"more specified" imports using `import std.uni : isUpper;` or
`import std.ascii : isUpper;` which will not clash with your
first import, as long as you don't try to import both in the same
scope. Basically:
import std;
import std.uni : isUpper;
bool someUserInputTest(string x) { return x[0].isUpper; }
Note that none of D's std.uni functions support using any locale,
so if you want to do anything more than the default language
neutral unicode locale you will have to use some library or using
the OS APIs. Note also that D is missing some unicode properties
like some check for characters which aren't lowercase or
UPPERCASE but Titlecase (like Dz [U+01F2 LATIN CAPITAL LETTER D
WITH SMALL LETTER Z]) which you could however use OS APIs for.
Jul 15 2020
On Wednesday, 15 July 2020 at 07:01:34 UTC, WebFreak001 wrote:On Tuesday, 14 July 2020 at 20:37:53 UTC, Marcone wrote:Without reading this very explanation, how would one know whilst reading docs?[...]Additionally to the other answers telling you how to fix it, it's important to know why it happens in the first place: [...]
Jul 15 2020
On Wednesday, 15 July 2020 at 11:25:34 UTC, aberba wrote:On Wednesday, 15 July 2020 at 07:01:34 UTC, WebFreak001 wrote:in that explanation I broadly covered: https://dlang.org/spec/module.html#name_lookup https://dlang.org/spec/module.html#selective_imports https://dlang.org/phobos/std_ascii.html https://dlang.org/phobos/std_ascii.html#isUpper https://dlang.org/phobos/std_uni.html https://dlang.org/phobos/std_uni.html#isUpper https://dlang.org/phobos/std_uni.html#CharacterOn Tuesday, 14 July 2020 at 20:37:53 UTC, Marcone wrote:Without reading this very explanation, how would one know whilst reading docs?[...]Additionally to the other answers telling you how to fix it, it's important to know why it happens in the first place: [...]
Jul 15 2020