http://llvm.org/bugs/show_bug.cgi?id=22066
Bug ID: 22066
Summary: [ms] Unqualified lookup in dependent classes doesn't
work for member template calls with explicit type
parameters
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
This compiles (good):
template<class T> struct Base {
template<class G> void f(G t) {}
};
template<class T> struct Sub : Base<T> {
void g() {
f(4);
}
};
void foo() {
Sub<int> i;
i.g();
}
D:\src\chromefetch\src\out\Release>
"D:\\src\\llvm-ninja-rel64\\bin\\clang-cl.exe" -m32 /c foo.ii
foo.ii(7,5) : warning: use of identifier 'f' found via unqualified lookup into
dependent bases of class templates is a
Microsoft extension [-Wmicrosoft]
f(4);
^
this->
But this doesn't:
template<class T> struct Base {
template<class G> void f(G t) {}
};
template<class T> struct Sub : Base<T> {
void g() {
f<int>(4);
}
};
void foo() {
Sub<int> i;
i.g();
}
D:\src\chromefetch\src\out\Release>
"D:\\src\\llvm-ninja-rel64\\bin\\clang-cl.exe" -m32 /c foo.ii
foo.ii(7,5) : warning: use of undeclared identifier 'f'; unqualified lookup
into dependent bases of class template 'Sub' is
a Microsoft extension [-Wmicrosoft]
f<int>(4);
^
this->
foo.ii(7,10) : error: expected '(' for function-style cast or type
construction
f<int>(4);
~~~^
1 warning and 1 error generated.
With the `this->`, another warning is emitted:
template<class T> struct Base {
template<class G> void f(G t) {}
};
template<class T> struct Sub : Base<T> {
void g() {
this->f<int>(4);
}
};
void foo() {
Sub<int> i;
i.g();
}
D:\src\chromefetch\src\out\Release>
"D:\\src\\llvm-ninja-rel64\\bin\\clang-cl.exe" -m32 /c foo.ii
foo.ii(7,11) : warning: use 'template' keyword to treat 'f' as a dependent
template name
this->f<int>(4);
^
template
1 warning generated.
I guess the fixit recovery we do with the this-> bit isn't applied correctly
with the fixit we do in MS mode for adding the "this->" somehow.
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