Please disregard this patch.

On Mon, Mar 20, 2023 at 12:44 AM Ken Matsui <kmatsui@cs.washington.edu>
wrote:

> This patch implements built-in trait for std::add_pointer.
>
> gcc/cp/ChangeLog:
>
> * cp-trait.def: Define __add_pointer.
> * semantics.cc (finish_trait_type): Handle CPTK_ADD_POINTER.
>
> gcc/testsuite/ChangeLog:
>
> * g++.dg/ext/has-builtin-1.C: Test existence of __add_pointer.
> * g++.dg/ext/add_pointer.C: New test.
>
> ---
> diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
> index bac593c0094..07fab8db26b 100644
> --- a/gcc/cp/cp-trait.def
> +++ b/gcc/cp/cp-trait.def
> @@ -91,6 +91,7 @@ DEFTRAIT_TYPE (REMOVE_CV, "__remove_cv", 1)
>  DEFTRAIT_TYPE (REMOVE_REFERENCE, "__remove_reference", 1)
>  DEFTRAIT_TYPE (REMOVE_CVREF, "__remove_cvref", 1)
>  DEFTRAIT_TYPE (UNDERLYING_TYPE,  "__underlying_type", 1)
> +DEFTRAIT_TYPE (ADD_POINTER, "__add_pointer", 1)
>
>  /* These traits yield a type pack, not a type, and are represented by
>     cp_parser_trait as a special BASES tree instead of a TRAIT_TYPE tree.
> */
> diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
> index 87c2e8a7111..3527f596983 100644
> --- a/gcc/cp/semantics.cc
> +++ b/gcc/cp/semantics.cc
> @@ -12273,6 +12273,10 @@ finish_trait_type (cp_trait_kind kind, tree
> type1, tree type2)
>        if (TYPE_REF_P (type1))
>   type1 = TREE_TYPE (type1);
>        return cv_unqualified (type1);
> +    case CPTK_ADD_POINTER:
> +      if (TYPE_REF_P (type1))
> +    type1 = TREE_TYPE (type1);
> +      return build_pointer_type (type1);
>
>  #define DEFTRAIT_EXPR(CODE, NAME, ARITY) \
>      case CPTK_##CODE:
> diff --git a/gcc/testsuite/g++.dg/ext/add_pointer.C
> b/gcc/testsuite/g++.dg/ext/add_pointer.C
> new file mode 100644
> index 00000000000..e35873553c8
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/ext/add_pointer.C
> @@ -0,0 +1,46 @@
> +// { dg-do compile { target c++11 } }
> +
> +#define SA(X) static_assert((X),#X)
> +
> +SA(__is_same(__add_pointer(int), int*));
> +SA(__is_same(__add_pointer(const int), const int*));
> +SA(__is_same(__add_pointer(volatile int), volatile int*));
> +SA(__is_same(__add_pointer(const volatile int), const volatile int*));
> +
> +SA(__is_same(__add_pointer(int*), int**));
> +SA(__is_same(__add_pointer(const int*), const int**));
> +SA(__is_same(__add_pointer(volatile int*), volatile int**));
> +SA(__is_same(__add_pointer(const volatile int*), const volatile int**));
> +
> +SA(__is_same(__add_pointer(int* const), int* const*));
> +SA(__is_same(__add_pointer(int* volatile), int* volatile*));
> +SA(__is_same(__add_pointer(int* const volatile), int* const volatile*));
> +
> +SA(__is_same(__add_pointer(int&), int*));
> +SA(__is_same(__add_pointer(const int&), const int*));
> +SA(__is_same(__add_pointer(volatile int&), volatile int*));
> +SA(__is_same(__add_pointer(const volatile int&), const volatile int*));
> +
> +SA(__is_same(__add_pointer(int&&), int*));
> +SA(__is_same(__add_pointer(const int&&), const int*));
> +SA(__is_same(__add_pointer(volatile int&&), volatile int*));
> +SA(__is_same(__add_pointer(const volatile int&&), const volatile int*));
> +
> +SA(__is_same(__add_pointer(int[3]), int(*)[3]));
> +SA(__is_same(__add_pointer(const int[3]), const int(*)[3]));
> +SA(__is_same(__add_pointer(volatile int[3]), volatile int(*)[3]));
> +SA(__is_same(__add_pointer(const volatile int[3]), const volatile
> int(*)[3]));
> +
> +SA(__is_same(__add_pointer(int(*)[3]), int(**)[3]));
> +SA(__is_same(__add_pointer(const int(*)[3]), const int(**)[3]));
> +SA(__is_same(__add_pointer(volatile int(*)[3]), volatile int(**)[3]));
> +SA(__is_same(__add_pointer(const volatile int(*)[3]), const volatile
> int(**)[3]));
> +
> +SA(__is_same(__add_pointer(int(* const)[3]), int(* const*)[3]));
> +SA(__is_same(__add_pointer(int(* volatile)[3]), int(* volatile*)[3]));
> +SA(__is_same(__add_pointer(int(* const volatile)[3]), int(* const
> volatile*)[3]));
> +
> +SA(__is_same(__add_pointer(int(int)), int(*)(int)));
> +SA(__is_same(__add_pointer(int(* const)(int)), int(* const*)(int)));
> +SA(__is_same(__add_pointer(int(* volatile)(int)), int(* volatile*)(int)));
> +SA(__is_same(__add_pointer(int(* const volatile)(int)), int(* const
> volatile*)(int)));
> diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> index f343e153e56..bed4f932bfa 100644
> --- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> +++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> @@ -146,3 +146,6 @@
>  #if !__has_builtin (__remove_cvref)
>  # error "__has_builtin (__remove_cvref) failed"
>  #endif
> +#if !__has_builtin (__add_pointer)
> +# error "__has_builtin (__add_pointer) failed"
> +#endif
>