February 27, 2017 getSymbolsByUDA toSymbols error instantiating | ||||
---|---|---|---|---|
| ||||
Hello. I have this code: ```d import std.traits; enum myuda; class A { @myuda int x; } class B : A { @myuda int some; void foo() { foreach (s; getSymbolsByUDA!(typeof(this), myuda)) {} } } void main() { (new B).foo(); } ``` And have this error: ``` % rdmd uda_symbols.d /usr/include/dmd/phobos/std/traits.d-mixin-7250(7250): Error: template instance AliasSeq!(some, x) AliasSeq!(some, x) is nested in both B and A /usr/include/dmd/phobos/std/traits.d(7259): Error: template instance std.traits.getSymbolsByUDA!(B, myuda).toSymbols!("some", "x") error instantiating uda_symbols.d(10): instantiated from here: getSymbolsByUDA!(B, myuda) ``` If I understand correctly it's happens because code in std.traits can't choose between A.x and B.x, but I don't understand why. It's a bug or it's has a more complex base? |
February 27, 2017 Re: getSymbolsByUDA toSymbols error instantiating | ||||
---|---|---|---|---|
| ||||
Posted in reply to Oleg B | On 02/27/2017 06:26 AM, Oleg B wrote: > Hello. I have this code: > > ```d > import std.traits; > > enum myuda; > > class A { @myuda int x; } > > class B : A > { > @myuda int some; > void foo() { foreach (s; getSymbolsByUDA!(typeof(this), myuda)) {} } > } > > void main() { (new B).foo(); } > ``` > > And have this error: > > ``` > % rdmd uda_symbols.d > /usr/include/dmd/phobos/std/traits.d-mixin-7250(7250): Error: template > instance AliasSeq!(some, x) AliasSeq!(some, x) is nested in both B and A > /usr/include/dmd/phobos/std/traits.d(7259): Error: template instance > std.traits.getSymbolsByUDA!(B, myuda).toSymbols!("some", "x") error > instantiating > uda_symbols.d(10): instantiated from here: getSymbolsByUDA!(B, > myuda) > ``` > > If I understand correctly it's happens because code in std.traits can't > choose between A.x and B.x, but I don't understand why. It's a bug or > it's has a more complex base? This looks like a bug to me. Please file it at https://issues.dlang.org/ Ali |
Copyright © 1999-2021 by the D Language Foundation