zyn0217 wrote:
> If so, get its TemplateTypeParmDecl, find the template whose parameter it is,
> and see if the template has a getOnlyInstantiation.
Thanks for the suggestion! Admittedly, it looks neat and terse. However, I
suspect it won't work with the present `TemplateTypeParm{Type,Decl}` models.
`TemplateTypeParmDecl` per se is not tied to any `CXXRecordDecl` nor
`FunctionDecl` that the template parameter is declaring with. (For the most
seemingly-relevant part, i.e. the `DeclContext` it records, is the scope that
the template defines.)
> If so, find the argument type substituted for this template parameter, and
> replace the template parameter with this type.
I was thinking this way before getting into the details :-). Soon I realized
that we had to tackle synthesized types e.g.
```cpp
template <template <class, int> typename C, typename D, int E>
void work() {
C<D, E> complicated_type;
// ^ Shall we perform the type substitution once again? ;)
}
```
https://github.com/llvm/llvm-project/pull/71279
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