Template argument deduction appears to be broken in Clang 6 for temporary objects.
g++ 8.1.0 compiles and runs the example correctly.
Clang 6.0.0 and 6.0.2 both error at the indicated line with this message:
error: expected unqualified-id
Print{1,"foo"s,2}; /********** Broken in Clang **********/
All Other lines work correctly.
The behavior is the same in both cases whether -std=c++17 or -std=c++2a is used.
The Clang c++ Status Page indicates that template argument deduction was implemented as of Clang 5 (P0091R3, P0512R0).
Is this a bug? Are there workarounds (e.g. compiler flags, not code changes)?
example:
template<class ...Ts>
void print(Ts...ts){ (( cout << ... << ts )); }
template<class ...Ts>
struct Print {
Print(Ts...ts){ (( cout << ... << ts )); }
};
int main(){
Print{1,"foo"s,2}; /********** Broken in Clang **********/
Print<int,string,int>{1,"foo"s,2};
auto p1 = Print{1,"foo"s,2};
Print p2{1,"foo"s,2};
print(1,"foo"s,2);
}
