http://llvm.org/bugs/show_bug.cgi?id=12057
Bug #: 12057
Summary: Clang rejects lambda expressions in parameter packs
Product: clang
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++0x
AssignedTo: unassignedclangb...@nondot.org
ReportedBy: dgre...@apple.com
CC: dgre...@apple.com, llvmbugs@cs.uiuc.edu
Classification: Unclassified
Clang is overly eager in its diagnosis of unexpanded parameter packs, assuming
that they cannot happen at statement boundaries. This is not the case, because
the following is well-formed but rejected by clang:
Cove:clang dgregor$ cat t2.cpp
template<typename ...Fs>
void apply_function_objects(Fs ...fs);
template<typename ...Args>
void print_all(Args... args) {
apply_function_objects([]() { print(args); }...);
}
Cove:clang dgregor$ clang++ -std=c++11 t2.cpp
t2.cpp:6:33: error: expression contains unexpanded parameter pack 'args'
apply_function_objects([]() { print(args); }...);
^ ~~~~
t2.cpp:6:47: error: pack expansion does not contain any unexpanded parameter
packs
apply_function_objects([]() { print(args); }...);
~~~~~~~~~~~~~~~~~~~~~^
2 errors generated.
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