[PATCH v15 23/39] c++: Implement __is_function built-in trait
Ken Matsui
kmatsui@gcc.gnu.org
Tue Oct 10 09:46:37 GMT 2023
This patch implements built-in trait for std::is_function.
gcc/cp/ChangeLog:
* cp-trait.def: Define __is_function.
* cp-trait.gperf: Reflect cp-trait.def change.
* cp-trait.h: Likewise.
* constraint.cc (diagnose_trait_expr): Handle CPTK_IS_FUNCTION.
* semantics.cc (trait_expr_value): Likewise.
(finish_trait_expr): Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/ext/has-builtin-1.C: Test existence of __is_function.
* g++.dg/ext/is_function.C: New test.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
gcc/cp/constraint.cc | 3 +
gcc/cp/cp-trait.def | 1 +
gcc/cp/cp-trait.gperf | 1 +
gcc/cp/cp-trait.h | 143 ++++++++++++-----------
gcc/cp/semantics.cc | 4 +
gcc/testsuite/g++.dg/ext/has-builtin-1.C | 3 +
gcc/testsuite/g++.dg/ext/is_function.C | 58 +++++++++
7 files changed, 143 insertions(+), 70 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/ext/is_function.C
diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index 5cdb59d174e..99a7e7247ce 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -3750,6 +3750,9 @@ diagnose_trait_expr (tree expr, tree args)
case CPTK_IS_FINAL:
inform (loc, " %qT is not a final class", t1);
break;
+ case CPTK_IS_FUNCTION:
+ inform (loc, " %qT is not a function", t1);
+ break;
case CPTK_IS_LAYOUT_COMPATIBLE:
inform (loc, " %qT is not layout compatible with %qT", t1, t2);
break;
diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
index e867d9c4c47..fa79bc0c68c 100644
--- a/gcc/cp/cp-trait.def
+++ b/gcc/cp/cp-trait.def
@@ -70,6 +70,7 @@ 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_FUNCTION, "__is_function", 1)
DEFTRAIT_EXPR (IS_LAYOUT_COMPATIBLE, "__is_layout_compatible", 2)
DEFTRAIT_EXPR (IS_LITERAL_TYPE, "__is_literal_type", 1)
DEFTRAIT_EXPR (IS_MEMBER_FUNCTION_POINTER, "__is_member_function_pointer", 1)
diff --git a/gcc/cp/cp-trait.gperf b/gcc/cp/cp-trait.gperf
index 1d902612f5a..4fa14de3e90 100644
--- a/gcc/cp/cp-trait.gperf
+++ b/gcc/cp/cp-trait.gperf
@@ -51,6 +51,7 @@ struct cp_trait {
"__is_empty", CPTK_IS_EMPTY, false, false, false
"__is_enum", CPTK_IS_ENUM, false, false, false
"__is_final", CPTK_IS_FINAL, false, false, false
+"__is_function", CPTK_IS_FUNCTION, false, false, false
"__is_layout_compatible", CPTK_IS_LAYOUT_COMPATIBLE, true, false, false
"__is_literal_type", CPTK_IS_LITERAL_TYPE, false, false, false
"__is_member_function_pointer", CPTK_IS_MEMBER_FUNCTION_POINTER, false, false, false
diff --git a/gcc/cp/cp-trait.h b/gcc/cp/cp-trait.h
index 7aa695210ce..c53e234f631 100644
--- a/gcc/cp/cp-trait.h
+++ b/gcc/cp/cp-trait.h
@@ -56,7 +56,7 @@ struct cp_trait {
bool variadic;
bool type;
};
-/* maximum key range = 94, duplicates = 0 */
+/* maximum key range = 109, duplicates = 0 */
class cp_trait_lookup
{
@@ -71,32 +71,32 @@ cp_trait_lookup::hash (const char *str, size_t len)
{
static const unsigned char asso_values[] =
{
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 20, 101, 40, 5, 40,
- 40, 0, 60, 10, 101, 0, 101, 101, 5, 25,
- 30, 0, 5, 101, 10, 15, 5, 0, 25, 101,
- 101, 20, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
- 101, 101, 101, 101, 101, 101
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 20, 116, 40, 5, 40,
+ 50, 0, 55, 10, 116, 0, 116, 116, 5, 25,
+ 30, 0, 5, 116, 10, 15, 5, 0, 25, 116,
+ 116, 20, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116, 116, 116, 116, 116,
+ 116, 116, 116, 116, 116, 116
};
unsigned int hval = len;
@@ -118,113 +118,113 @@ cp_trait_lookup::find (const char *str, size_t len)
{
enum
{
- TOTAL_KEYWORDS = 55,
+ TOTAL_KEYWORDS = 56,
MIN_WORD_LENGTH = 7,
MAX_WORD_LENGTH = 37,
MIN_HASH_VALUE = 7,
- MAX_HASH_VALUE = 100
+ MAX_HASH_VALUE = 115
};
static const struct cp_trait wordlist[] =
{
-#line 84 "../../gcc/cp/cp-trait.gperf"
+#line 85 "../../gcc/cp/cp-trait.gperf"
{"__bases", CPTK_BASES, false, false, true},
#line 52 "../../gcc/cp/cp-trait.gperf"
{"__is_enum", CPTK_IS_ENUM, false, false, false},
-#line 74 "../../gcc/cp/cp-trait.gperf"
+#line 75 "../../gcc/cp/cp-trait.gperf"
{"__is_union", CPTK_IS_UNION, false, false, false},
-#line 78 "../../gcc/cp/cp-trait.gperf"
- {"__remove_cv", CPTK_REMOVE_CV, false, false, true},
#line 79 "../../gcc/cp/cp-trait.gperf"
+ {"__remove_cv", CPTK_REMOVE_CV, false, false, true},
+#line 80 "../../gcc/cp/cp-trait.gperf"
{"__remove_cvref", CPTK_REMOVE_CVREF, false, false, true},
#line 51 "../../gcc/cp/cp-trait.gperf"
{"__is_empty", CPTK_IS_EMPTY, false, false, false},
-#line 69 "../../gcc/cp/cp-trait.gperf"
+#line 70 "../../gcc/cp/cp-trait.gperf"
{"__is_trivial", CPTK_IS_TRIVIAL, false, false, false},
-#line 80 "../../gcc/cp/cp-trait.gperf"
+#line 81 "../../gcc/cp/cp-trait.gperf"
{"__remove_reference", CPTK_REMOVE_REFERENCE, false, false, true},
-#line 85 "../../gcc/cp/cp-trait.gperf"
+#line 86 "../../gcc/cp/cp-trait.gperf"
{"__direct_bases", CPTK_DIRECT_BASES, false, false, true},
-#line 82 "../../gcc/cp/cp-trait.gperf"
+#line 83 "../../gcc/cp/cp-trait.gperf"
{"__underlying_type", CPTK_UNDERLYING_TYPE, false, false, true},
#line 46 "../../gcc/cp/cp-trait.gperf"
{"__is_bounded_array", CPTK_IS_BOUNDED_ARRAY, false, false, false},
-#line 81 "../../gcc/cp/cp-trait.gperf"
+#line 82 "../../gcc/cp/cp-trait.gperf"
{"__type_pack_element", CPTK_TYPE_PACK_ELEMENT, false, true, true},
-#line 73 "../../gcc/cp/cp-trait.gperf"
+#line 74 "../../gcc/cp/cp-trait.gperf"
{"__is_unbounded_array", CPTK_IS_UNBOUNDED_ARRAY, false, false, false},
-#line 64 "../../gcc/cp/cp-trait.gperf"
+#line 65 "../../gcc/cp/cp-trait.gperf"
{"__is_polymorphic", CPTK_IS_POLYMORPHIC, false, false, false},
-#line 55 "../../gcc/cp/cp-trait.gperf"
+#line 56 "../../gcc/cp/cp-trait.gperf"
{"__is_literal_type", CPTK_IS_LITERAL_TYPE, false, false, false},
-#line 72 "../../gcc/cp/cp-trait.gperf"
+#line 73 "../../gcc/cp/cp-trait.gperf"
{"__is_trivially_copyable", CPTK_IS_TRIVIALLY_COPYABLE, false, false, false},
-#line 70 "../../gcc/cp/cp-trait.gperf"
+#line 71 "../../gcc/cp/cp-trait.gperf"
{"__is_trivially_assignable", CPTK_IS_TRIVIALLY_ASSIGNABLE, true, false, false},
-#line 67 "../../gcc/cp/cp-trait.gperf"
+#line 68 "../../gcc/cp/cp-trait.gperf"
{"__is_scoped_enum", CPTK_IS_SCOPED_ENUM, false, false, false},
#line 45 "../../gcc/cp/cp-trait.gperf"
{"__is_base_of", CPTK_IS_BASE_OF, true, false, false},
-#line 71 "../../gcc/cp/cp-trait.gperf"
+#line 72 "../../gcc/cp/cp-trait.gperf"
{"__is_trivially_constructible", CPTK_IS_TRIVIALLY_CONSTRUCTIBLE, false, true, false},
-#line 77 "../../gcc/cp/cp-trait.gperf"
+#line 78 "../../gcc/cp/cp-trait.gperf"
{"__reference_converts_from_temporary", CPTK_REF_CONVERTS_FROM_TEMPORARY, true, false, false},
-#line 76 "../../gcc/cp/cp-trait.gperf"
+#line 77 "../../gcc/cp/cp-trait.gperf"
{"__reference_constructs_from_temporary", CPTK_REF_CONSTRUCTS_FROM_TEMPORARY, true, false, false},
#line 34 "../../gcc/cp/cp-trait.gperf"
{"__has_nothrow_copy", CPTK_HAS_NOTHROW_COPY, false, false, false},
#line 32 "../../gcc/cp/cp-trait.gperf"
{"__has_nothrow_assign", CPTK_HAS_NOTHROW_ASSIGN, false, false, false},
-#line 62 "../../gcc/cp/cp-trait.gperf"
+#line 63 "../../gcc/cp/cp-trait.gperf"
{"__is_pointer_interconvertible_base_of", CPTK_IS_POINTER_INTERCONVERTIBLE_BASE_OF, true, false, false},
-#line 75 "../../gcc/cp/cp-trait.gperf"
+#line 76 "../../gcc/cp/cp-trait.gperf"
{"__is_volatile", CPTK_IS_VOLATILE, false, false, false},
#line 40 "../../gcc/cp/cp-trait.gperf"
{"__has_virtual_destructor", CPTK_HAS_VIRTUAL_DESTRUCTOR, false, false, false},
#line 33 "../../gcc/cp/cp-trait.gperf"
{"__has_nothrow_constructor", CPTK_HAS_NOTHROW_CONSTRUCTOR, false, false, false},
-#line 54 "../../gcc/cp/cp-trait.gperf"
+#line 55 "../../gcc/cp/cp-trait.gperf"
{"__is_layout_compatible", CPTK_IS_LAYOUT_COMPATIBLE, true, false, false},
#line 37 "../../gcc/cp/cp-trait.gperf"
{"__has_trivial_copy", CPTK_HAS_TRIVIAL_COPY, false, false, false},
-#line 66 "../../gcc/cp/cp-trait.gperf"
+#line 67 "../../gcc/cp/cp-trait.gperf"
{"__is_same", CPTK_IS_SAME, true, false, false},
#line 35 "../../gcc/cp/cp-trait.gperf"
{"__has_trivial_assign", CPTK_HAS_TRIVIAL_ASSIGN, false, false, false},
#line 31 "../../gcc/cp/cp-trait.gperf"
{"__is_same_as", CPTK_IS_SAME, true, false, false},
-#line 63 "../../gcc/cp/cp-trait.gperf"
- {"__is_pod", CPTK_IS_POD, false, false, false},
#line 38 "../../gcc/cp/cp-trait.gperf"
{"__has_trivial_destructor", CPTK_HAS_TRIVIAL_DESTRUCTOR, false, false, false},
#line 36 "../../gcc/cp/cp-trait.gperf"
{"__has_trivial_constructor", CPTK_HAS_TRIVIAL_CONSTRUCTOR, false, false, false},
-#line 59 "../../gcc/cp/cp-trait.gperf"
+#line 60 "../../gcc/cp/cp-trait.gperf"
{"__is_nothrow_assignable", CPTK_IS_NOTHROW_ASSIGNABLE, true, false, false},
-#line 61 "../../gcc/cp/cp-trait.gperf"
+#line 62 "../../gcc/cp/cp-trait.gperf"
{"__is_nothrow_convertible", CPTK_IS_NOTHROW_CONVERTIBLE, true, false, false},
#line 43 "../../gcc/cp/cp-trait.gperf"
{"__is_array", CPTK_IS_ARRAY, false, false, false},
-#line 60 "../../gcc/cp/cp-trait.gperf"
+#line 61 "../../gcc/cp/cp-trait.gperf"
{"__is_nothrow_constructible", CPTK_IS_NOTHROW_CONSTRUCTIBLE, false, true, false},
+#line 64 "../../gcc/cp/cp-trait.gperf"
+ {"__is_pod", CPTK_IS_POD, false, false, false},
#line 42 "../../gcc/cp/cp-trait.gperf"
{"__is_aggregate", CPTK_IS_AGGREGATE, false, false, false},
#line 41 "../../gcc/cp/cp-trait.gperf"
{"__is_abstract", CPTK_IS_ABSTRACT, false, false, false},
-#line 58 "../../gcc/cp/cp-trait.gperf"
+#line 59 "../../gcc/cp/cp-trait.gperf"
{"__is_member_pointer", CPTK_IS_MEMBER_POINTER, false, false, false},
#line 44 "../../gcc/cp/cp-trait.gperf"
{"__is_assignable", CPTK_IS_ASSIGNABLE, true, false, false},
-#line 68 "../../gcc/cp/cp-trait.gperf"
+#line 69 "../../gcc/cp/cp-trait.gperf"
{"__is_standard_layout", CPTK_IS_STD_LAYOUT, false, false, false},
-#line 57 "../../gcc/cp/cp-trait.gperf"
+#line 58 "../../gcc/cp/cp-trait.gperf"
{"__is_member_object_pointer", CPTK_IS_MEMBER_OBJECT_POINTER, false, false, false},
-#line 56 "../../gcc/cp/cp-trait.gperf"
+#line 57 "../../gcc/cp/cp-trait.gperf"
{"__is_member_function_pointer", CPTK_IS_MEMBER_FUNCTION_POINTER, false, false, false},
+#line 66 "../../gcc/cp/cp-trait.gperf"
+ {"__is_reference", CPTK_IS_REFERENCE, false, false, false},
#line 48 "../../gcc/cp/cp-trait.gperf"
{"__is_const", CPTK_IS_CONST, false, false, false},
-#line 65 "../../gcc/cp/cp-trait.gperf"
- {"__is_reference", CPTK_IS_REFERENCE, false, false, false},
#line 39 "../../gcc/cp/cp-trait.gperf"
{"__has_unique_object_representations", CPTK_HAS_UNIQUE_OBJ_REPRESENTATIONS, false, false, false},
#line 50 "../../gcc/cp/cp-trait.gperf"
@@ -233,10 +233,12 @@ cp_trait_lookup::find (const char *str, size_t len)
{"__is_constructible", CPTK_IS_CONSTRUCTIBLE, false, true, false},
#line 47 "../../gcc/cp/cp-trait.gperf"
{"__is_class", CPTK_IS_CLASS, false, false, false},
-#line 83 "../../gcc/cp/cp-trait.gperf"
- {"__is_deducible ", CPTK_IS_DEDUCIBLE, true, false, false},
#line 53 "../../gcc/cp/cp-trait.gperf"
- {"__is_final", CPTK_IS_FINAL, false, false, false}
+ {"__is_final", CPTK_IS_FINAL, false, false, false},
+#line 54 "../../gcc/cp/cp-trait.gperf"
+ {"__is_function", CPTK_IS_FUNCTION, false, false, false},
+#line 84 "../../gcc/cp/cp-trait.gperf"
+ {"__is_deducible ", CPTK_IS_DEDUCIBLE, true, false, false}
};
static const signed char lookup[] =
@@ -244,11 +246,12 @@ cp_trait_lookup::find (const char *str, size_t len)
-1, -1, -1, -1, -1, -1, -1, 0, -1, 1, 2, 3, -1, -1,
4, 5, -1, 6, 7, 8, -1, -1, 9, 10, 11, 12, 13, 14,
15, -1, 16, 17, 18, 19, -1, 20, -1, 21, 22, -1, 23, -1,
- 24, 25, 26, 27, -1, 28, 29, 30, 31, -1, 32, 33, 34, 35,
- -1, -1, 36, 37, 38, 39, -1, -1, 40, -1, -1, -1, 41, 42,
- 43, -1, -1, -1, -1, 44, 45, -1, 46, -1, 47, -1, -1, -1,
- 48, 49, 50, -1, 51, -1, 52, -1, -1, -1, -1, 53, -1, -1,
- -1, -1, 54
+ 24, 25, 26, 27, -1, 28, 29, 30, 31, -1, 32, -1, 33, 34,
+ -1, -1, 35, 36, 37, 38, -1, 39, 40, -1, -1, -1, 41, 42,
+ 43, -1, -1, -1, -1, 44, 45, -1, 46, 47, 48, -1, -1, -1,
+ -1, 49, 50, -1, 51, -1, 52, -1, -1, -1, -1, 53, -1, -1,
+ 54, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, 55
};
if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index df720459458..4b8e80f3e62 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -12178,6 +12178,9 @@ 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_FUNCTION:
+ return type_code1 == FUNCTION_TYPE;
+
case CPTK_IS_LAYOUT_COMPATIBLE:
return layout_compatible_type_p (type1, type2);
@@ -12405,6 +12408,7 @@ finish_trait_expr (location_t loc, cp_trait_kind kind, tree type1, tree type2)
case CPTK_IS_CLASS:
case CPTK_IS_CONST:
case CPTK_IS_ENUM:
+ case CPTK_IS_FUNCTION:
case CPTK_IS_MEMBER_FUNCTION_POINTER:
case CPTK_IS_MEMBER_OBJECT_POINTER:
case CPTK_IS_MEMBER_POINTER:
diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
index e112d317657..4d3947572a4 100644
--- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
+++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
@@ -89,6 +89,9 @@
#if !__has_builtin (__is_final)
# error "__has_builtin (__is_final) failed"
#endif
+#if !__has_builtin (__is_function)
+# error "__has_builtin (__is_function) failed"
+#endif
#if !__has_builtin (__is_layout_compatible)
# error "__has_builtin (__is_layout_compatible) failed"
#endif
diff --git a/gcc/testsuite/g++.dg/ext/is_function.C b/gcc/testsuite/g++.dg/ext/is_function.C
new file mode 100644
index 00000000000..2e1594b12ad
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/is_function.C
@@ -0,0 +1,58 @@
+// { dg-do compile { target c++11 } }
+
+#include <testsuite_tr1.h>
+
+using namespace __gnu_test;
+
+#define SA(X) static_assert((X),#X)
+#define SA_TEST_CATEGORY(TRAIT, TYPE, EXPECT) \
+ SA(TRAIT(TYPE) == EXPECT); \
+ SA(TRAIT(const TYPE) == EXPECT); \
+ SA(TRAIT(volatile TYPE) == EXPECT); \
+ SA(TRAIT(const volatile TYPE) == EXPECT)
+
+struct A
+{ void fn(); };
+
+template<typename>
+struct AHolder { };
+
+template<class T, class U>
+struct AHolder<U T::*>
+{ using type = U; };
+
+// Positive tests.
+SA(__is_function(int (int)));
+SA(__is_function(ClassType (ClassType)));
+SA(__is_function(float (int, float, int[], int&)));
+SA(__is_function(int (int, ...)));
+SA(__is_function(bool (ClassType) const));
+SA(__is_function(AHolder<decltype(&A::fn)>::type));
+
+void fn();
+SA(__is_function(decltype(fn)));
+
+// Negative tests.
+SA_TEST_CATEGORY(__is_function, int, false);
+SA_TEST_CATEGORY(__is_function, int*, false);
+SA_TEST_CATEGORY(__is_function, int&, false);
+SA_TEST_CATEGORY(__is_function, void, false);
+SA_TEST_CATEGORY(__is_function, void*, false);
+SA_TEST_CATEGORY(__is_function, void**, false);
+SA_TEST_CATEGORY(__is_function, std::nullptr_t, false);
+
+SA_TEST_CATEGORY(__is_function, AbstractClass, false);
+SA(!__is_function(int(&)(int)));
+SA(!__is_function(int(*)(int)));
+
+SA_TEST_CATEGORY(__is_function, A, false);
+SA_TEST_CATEGORY(__is_function, decltype(&A::fn), false);
+
+struct FnCallOverload
+{ void operator()(); };
+SA_TEST_CATEGORY(__is_function, FnCallOverload, false);
+
+// Sanity check.
+SA_TEST_CATEGORY(__is_function, ClassType, false);
+SA_TEST_CATEGORY(__is_function, IncompleteClass, false);
+SA_TEST_CATEGORY(__is_function, IncompleteUnion, false);
--
2.42.0
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