http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56190
Bug #: 56190
Summary: GCC fails deducing a "void(*)(int, float, double)" to
a "void(*)(T..., float, double)" with T={int}
Classification: Unclassified
Product: gcc
Version: 4.7.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
From
http://stackoverflow.com/questions/14664589/variadic-template-code-compiles-on-gcc-4-6-but-not-on-clang-or-gcc-4-7
:
class Test {
public:
template <class... A2> void print (void(*function)(A2..., float, double)) {
}
};
void test_print (int a, float b, double c) { }
int main () {
Test test;
test.print<int> (&test_print);
}
Fails with
source.cpp:14:33: note: candidate is:
source.cpp:3:33: note: template<class ... A2> void Test::print(void (*)(A2 ...,
float, double))
source.cpp:3:33: note: template argument deduction/substitution failed:
source.cpp:14:33: note: mismatched types 'float' and 'int'
GCC does apparently not substitute the explicitly specified arguments of "A2"
before attempting the argument deduction.
