https://bugs.llvm.org/show_bug.cgi?id=50864
Bug ID: 50864
Summary: An example code from the standard (templates and
concepts) does not compile
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++2a
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
According to [temp.constr.decl]/4 the following example should compile:
template <class T> concept C = true;
template <class T> struct A {
template <class U> U f(U) requires C<typename T::type>; // #1
template <class U> U f(U) requires C<T>; // #2
};
template <> template <class U>
U A<int>::f(U u) requires C<int> { return u; } // OK, specializes
#2
However, clang gives an error:
<source>:3:49: error: type 'int' cannot be used prior to '::' because it has no
members
template <class U> U f(U) requires C<typename T::type>; // #1
^
I believe this is the reason why clang cannot compile libstdc++ ranges:
https://bugs.llvm.org/show_bug.cgi?id=46746
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