http://bugs.llvm.org/show_bug.cgi?id=32179
Bug ID: 32179
Summary: SFINAE emits a substitution error even though it
shouldn't when checking an overload
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Created attachment 18065
--> http://bugs.llvm.org/attachment.cgi?id=18065&action=edit
The test file that reproduces the problem
Clang trunk emits a substitution error when checking if a particular overload
of 'invoke' can be selected:
test.cpp:135:50: error: type 'decay_t<double>' (aka 'double') cannot be used
prior to '::' because it has no members
using functor_type = function_traits<decltype(&decay_t<F>::operator())>;
^
test.cpp:184:25: note: in instantiation of template class
'function_traits<double>' requested here
make_index_sequence<function_traits<Functor>::arity> { }))>
^
test.cpp:224:29: note: while substituting deduced template arguments into
function template 'invoke' [with Functor = double, Runpackable = double]
constexpr double result = invoke(test { }, 0.5, 2.5);
Even though we get this SFINAE error, Clang still selects the correct version
of 'invoke' (verified by AST inspection and static assert check).
GCC compiles the test file successfully.
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