* cp-trait.def (names_builtin_p): Define __is_reference. This changelog should be the following.
* cp-trait.def: Define __is_reference. I am sorry for the confusion. On Sat, Mar 18, 2023 at 9:07 PM Ken Matsui <kmat...@cs.washington.edu> wrote: > > This patch implements built-in trait for std::is_reference. > > gcc/cp/ChangeLog: > > * cp-trait.def (names_builtin_p): Define __is_reference. > * constraint.cc (diagnose_trait_expr): Handle CPTK_IS_REFERENCE. > * semantics.cc (trait_expr_value): Likewise. > (finish_trait_expr): Likewise. > > gcc/testsuite/ChangeLog: > > * g++.dg/ext/has-builtin-1.C: Test existence of __is_reference. > * g++.dg/ext/is_reference.C: New test. > > --- > diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc > index 273d15ab097..23e5bc24dbb 100644 > --- a/gcc/cp/constraint.cc > +++ b/gcc/cp/constraint.cc > @@ -3701,6 +3701,9 @@ diagnose_trait_expr (tree expr, tree args) > case CPTK_HAS_VIRTUAL_DESTRUCTOR: > inform (loc, " %qT does not have a virtual destructor", t1); > break; > + case CPTK_IS_REFERENCE: > + inform (loc, " %qT is not a reference", t1); > + break; > case CPTK_IS_ABSTRACT: > inform (loc, " %qT is not an abstract class", t1); > break; > diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def > index bac593c0094..63a64152ce6 100644 > --- a/gcc/cp/cp-trait.def > +++ b/gcc/cp/cp-trait.def > @@ -67,6 +67,7 @@ DEFTRAIT_EXPR (IS_CONVERTIBLE, "__is_convertible", 2) > DEFTRAIT_EXPR (IS_EMPTY, "__is_empty", 1) > DEFTRAIT_EXPR (IS_ENUM, "__is_enum", 1) > DEFTRAIT_EXPR (IS_FINAL, "__is_final", 1) > +DEFTRAIT_EXPR (IS_REFERENCE, "__is_reference", 1) > DEFTRAIT_EXPR (IS_LAYOUT_COMPATIBLE, "__is_layout_compatible", 2) > DEFTRAIT_EXPR (IS_LITERAL_TYPE, "__is_literal_type", 1) > DEFTRAIT_EXPR (IS_NOTHROW_ASSIGNABLE, "__is_nothrow_assignable", 2) > diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc > index 87c2e8a7111..dce98af4f72 100644 > --- a/gcc/cp/semantics.cc > +++ b/gcc/cp/semantics.cc > @@ -11995,6 +11995,9 @@ trait_expr_value (cp_trait_kind kind, tree > type1, tree type2) > case CPTK_IS_FINAL: > return CLASS_TYPE_P (type1) && CLASSTYPE_FINAL (type1); > > + case CPTK_IS_REFERENCE: > + return type_code1 == REFERENCE_TYPE; > + > case CPTK_IS_LAYOUT_COMPATIBLE: > return layout_compatible_type_p (type1, type2); > > @@ -12139,6 +12142,7 @@ finish_trait_expr (location_t loc, > cp_trait_kind kind, tree type1, tree type2) > case CPTK_HAS_TRIVIAL_COPY: > case CPTK_HAS_TRIVIAL_DESTRUCTOR: > case CPTK_HAS_UNIQUE_OBJ_REPRESENTATIONS: > + case CPTK_IS_REFERENCE: > if (!check_trait_type (type1)) > return error_mark_node; > break; > diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C > b/gcc/testsuite/g++.dg/ext/has-builtin-1.C > index f343e153e56..b697673790c 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 (__is_reference) > +# error "__has_builtin (__is_reference) failed" > +#endif > diff --git a/gcc/testsuite/g++.dg/ext/is_reference.C > b/gcc/testsuite/g++.dg/ext/is_reference.C > new file mode 100644 > index 00000000000..b4f048538e5 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/ext/is_reference.C > @@ -0,0 +1,26 @@ > +// { dg-do compile { target c++11 } } > + > +#define SA(X) static_assert((X),#X) > + > +SA(!__is_reference(void)); > +SA(!__is_reference(int*)); > + > +SA(__is_reference(int&)); > +SA(__is_reference(const int&)); > +SA(__is_reference(volatile int&)); > +SA(__is_reference(const volatile int&)); > + > +SA(__is_reference(int&&)); > +SA(__is_reference(const int&&)); > +SA(__is_reference(volatile int&&)); > +SA(__is_reference(const volatile int&&)); > + > +SA(!__is_reference(int[3])); > +SA(!__is_reference(const int[3])); > +SA(!__is_reference(volatile int[3])); > +SA(!__is_reference(const volatile int[3])); > + > +SA(!__is_reference(int(int))); > +SA(!__is_reference(int(*const)(int))); > +SA(!__is_reference(int(*volatile)(int))); > +SA(!__is_reference(int(*const volatile)(int)));