substitute with predicate won't compile

3 days ago

Bastiaan Veelo

3 days ago

H. S. Teoh

3 days ago

Bastiaan Veelo

3 days ago

H. S. Teoh

3 days ago

Dukc

import std; void main() { string s; //... s = s.substitute!((a, b) => sicmp(a, b) == 0, "&", "&", "<", "<", ">", ">", """, `"`, "'", "'").array; }

On Tue, Oct 28, 2025 at 07:43:56PM +0000, Bastiaan Veelo via Digitalmars-d-learn wrote: > Why doesn't this compile? > > ```d > import std; > > void main() > { > string s; > //... > s = s.substitute!((a, b) => sicmp(a, b) == 0, "&", "&", > "<", "<", > ">", ">", > """, `"`, > "'", "'").array; > } > ``` You have all your arguments as CT arguments; I think .substitute wants the lamdba as a CT argument but the other arguments as RT. But having said that, after changing the substitution arguments to RT arguments, it still doesn't compile for me for some reason. So I dunno. T -- They say that "guns don't kill people, people kill people." Well I think the gun helps. If you just stood there and yelled BANG, I don't think you'd kill too many people. -- Eddie Izzard, Dressed to Kill

import std; void main() { string s; //... s = s.substitute!((a, b) => sicmp(a, b) == 0, "&", "&", "<", "<", ">", ">", """, `"`, "'", "'").array; }

s = s.substitute!"a.toLower==b.toLower"("&", "&", "<", "<", ">", ">", """, `"`, "'", "'").to!string;

On Tue, Oct 28, 2025 at 09:14:42PM +0000, Bastiaan Veelo via Digitalmars-d-learn wrote: [...] > This seems to be a bug. It does work with runtime arguments, but only > if the predicate is given as a string: > ```d > s = s.substitute!"a.toLower==b.toLower"("&", "&", > "<", "<", > ">", ">", > """, `"`, > "'", "'").to!string; > ``` [...] Hmm. Probably a bug then! T -- What do you get if you throw a grenade into a French kitchen? Linoleum blown apart.

3 days ago

Re: substitute with predicate won't compile

Posted by Dukc
in reply to Bastiaan Veelo

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Dukc

Posted in reply to Bastiaan Veelo

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On Tuesday, 28 October 2025 at 21:14:42 UTC, Bastiaan Veelo wrote:

This seems to be a bug. It does work with runtime arguments, but only if the predicate is given as a string:

    s = s.substitute!"a.toLower==b.toLower"("&amp;", "&",
                                            "&lt;", "<",
                                            "&gt;", ">",
                                            "&quot;", `"`,
                                            "&apos;", "'").to!string;

-- Bastiaan.

Yes, I tried this and it seems to be the case. My error:

/nix/store/inkxb5vqy7agpm0wzqk07ha9a9llnfd2-dmd-2.107.1/include/dmd/std/algorithm/iteration.d(6953): Error: function `app.main.substitute!((a, b) => a == b, string, string, string, string, string, string, string, string, string, string, string).substitute.SubstituteSplitter.popFront` cannot access function `find` in frame of function `D main`
/nix/store/inkxb5vqy7agpm0wzqk07ha9a9llnfd2-dmd-2.107.1/include/dmd/std/algorithm/searching.d(2388):        `find` declared here
app.d(8): Error: template instance `app.main.substitute!((a, b) => a == b, string, string, string, string, string, string, string, string, string, string, string)` error instantiating

I believe it means substitute is not correctly taking context pointers into account.

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