lliu0 created this revision.
lliu0 added reviewers: rjmccall, vsapsai.
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>From http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1584,
>function type should not match cv-qualified type in template argument
>deduction. This also matches what GCC and EDG do in template argument
>deduction.
Repository:
rC Clang
https://reviews.llvm.org/D45755
Files:
lib/Sema/SemaTemplateDeduction.cpp
test/CXX/drs/dr15xx.cpp
test/CXX/drs/dr4xx.cpp
test/SemaTemplate/function-pointer-qualifier.cpp
Index: test/SemaTemplate/function-pointer-qualifier.cpp
===================================================================
--- /dev/null
+++ test/SemaTemplate/function-pointer-qualifier.cpp
@@ -0,0 +1,29 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+template<class _Ty> inline
+ void testparam(_Ty **, _Ty **)
+ {
+ }
+
+template<class _Ty> inline
+ void testparam(_Ty *const *, _Ty **)
+ {
+ }
+
+template<class _Ty> inline
+ void testparam(_Ty **, const _Ty **)
+ {
+ }
+
+template<class _Ty> inline
+ void testparam(_Ty *const *, const _Ty **)
+ {
+ }
+
+void case0()
+{
+ void (**p1)();
+ void (**p2)();
+ testparam(p1, p2);
+}
Index: test/CXX/drs/dr4xx.cpp
===================================================================
--- test/CXX/drs/dr4xx.cpp
+++ test/CXX/drs/dr4xx.cpp
@@ -796,24 +796,9 @@
}
namespace dr469 { // dr469: no
- // FIXME: The core issue here didn't really answer the question. We don't
- // deduce 'const T' from a function or reference type in a class template...
- template<typename T> struct X; // expected-note 2{{here}}
+ template<typename T> struct X; // expected-note {{here}}
template<typename T> struct X<const T> {};
X<int&> x; // expected-error {{undefined}}
- X<int()> y; // expected-error {{undefined}}
-
- // ... but we do in a function template. GCC and EDG fail deduction of 'f'
- // and the second 'h'.
- template<typename T> void f(const T *);
- template<typename T> void g(T *, const T * = 0);
- template<typename T> void h(T *) { T::error; }
- template<typename T> void h(const T *);
- void i() {
- f(&i);
- g(&i);
- h(&i);
- }
}
namespace dr470 { // dr470: yes
Index: test/CXX/drs/dr15xx.cpp
===================================================================
--- test/CXX/drs/dr15xx.cpp
+++ test/CXX/drs/dr15xx.cpp
@@ -357,6 +357,19 @@
};
} // end namespace dr1579
+namespace dr1584 {
+ // Deducing function types from cv-qualified types
+ template<typename T> void f(const T *); // expected-note {{candidate template ignored}}
+ template<typename T> void g(T *, const T * = 0);
+ template<typename T> void h(T *) { T::error; } // expected-error {{no members}}
+ template<typename T> void h(const T *);
+ void i() {
+ f(&i); // expected-error {{no matching function}}
+ g(&i);
+ h(&i); // expected-note {{here}}
+ }
+}
+
namespace dr1589 { // dr1589: 3.7 c++11
// Ambiguous ranking of list-initialization sequences
Index: lib/Sema/SemaTemplateDeduction.cpp
===================================================================
--- lib/Sema/SemaTemplateDeduction.cpp
+++ lib/Sema/SemaTemplateDeduction.cpp
@@ -1273,6 +1273,12 @@
return Sema::TDK_Underqualified;
}
+ // Do not match a function type with a cv-qualified type.
+ // http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1584
+ if (Arg->isFunctionType() && Param.hasQualifiers()) {
+ return Sema::TDK_NonDeducedMismatch;
+ }
+
assert(TemplateTypeParm->getDepth() == Info.getDeducedDepth() &&
"saw template type parameter with wrong depth");
assert(Arg != S.Context.OverloadTy && "Unresolved overloaded function");
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