[Issue 18955] extern(C++) default struct mangling is overridden when interacting with a `cppmangle = class` tamplate
https://issues.dlang.org/show_bug.cgi?id=18955
--- Comment #3 from Manu ---
I'm sorry. I think I must have cut fail-ed. Remove the `Alloc` arg:
---
extern (C++, std)
{
struct char_traits(Char)
{
}
extern (C++, class) struct basic_string(T, Traits)
{
}
alias test_string = basic_string!(char, char_traits!char);
}
extern (C++) void test(ref const(std.test_string) str) {}
pragma(msg, test.mangleof);
---
Compile that, it will emit:
?test@@YAXAEBV?$basic_string@DV?$char_traits@D@std@@@std@@@Z
But it should emit:
?test@@YAXAEBV?$basic_string@DU?$char_traits@D@std@@@std@@@Z
Notice the 'V?$char_traits' (class) should be a 'U?$char_traits' (struct);
char_traits is a struct.
If you add:
extern (C++, struct) struct char_traits(Char)
ie, tell it explicitly to mangle the struct as a struct, it mangles correctly.
Of course, a struct should mangle as a struct naturally though.
--
[Issue 18955] extern(C++) default struct mangling is overridden when interacting with a `cppmangle = class` tamplate
https://issues.dlang.org/show_bug.cgi?id=18955 Mike Franklin changed: What|Removed |Added CC||slavo5...@yahoo.com --- Comment #2 from Mike Franklin --- `alias string = basic_string!(char, char_traits!char);` has two template arguments, but `extern (C++, class) struct basic_string(T, Traits, Alloc)` had 3. This results in: Error: template instance `basic_string!(char, char_traits!char)` does not match template declaration I'm not sure what I should be doing to reproduce the problem. --
[Issue 18955] extern(C++) default struct mangling is overridden when interacting with a `cppmangle = class` tamplate
https://issues.dlang.org/show_bug.cgi?id=18955 Manu changed: What|Removed |Added Keywords||C++, industry --- Comment #1 from Manu --- This symptom is a result of the same logic that causes the related ICE at typesem.d:~1310 I don't understand the logic, perhaps Walter can take a look who understands the intent of that code? --
