https://bugs.llvm.org/show_bug.cgi?id=52025
Bug ID: 52025
Summary: clang cannot deduce return type for the implicit
instantiation of template specialization
Product: clang
Version: 12.0
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++14
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
The following code fails to compile, however must to.
template <typename T>
struct S
{
template <typename U>
decltype(auto) operator[](U u);
};
template <>
template <typename U>
decltype(auto) S<int>::operator[](U u)
{
return u;
}
int main()
{
S<int> s;
std::cout << s[1] <<std::endl;
return 0;
}
https://godbolt.org/z/MqqY5cTjx
Impicit instantiation of S<int> definition implies implicit instantiation of
the operator[] template declaration at the line
13(https://eel.is/c++draft/temp#inst-3.1). After that a[1] shall be resolved in
favor of declaration instantiated from template at the line
13(https://eel.is/c++draft/temp#inst-10), which implies implicit instantiation
of the operator[] definition(https://eel.is/c++draft/temp#inst-4), which allows
compiler to deduce return
type(https://eel.is/c++draft/dcl.spec.auto#general-12)
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