https://bugs.llvm.org/show_bug.cgi?id=50276
Bug ID: 50276
Summary: [concepts] error: out-of-line definition of 'length'
from class 'utf_t<type-parameter-0-0>' without
definition
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
$ cat utf.cpp
#include <concepts>
template <typename>
struct utf_t;
template <typename T>
requires (std::is_same_v<T, char32_t>) ||
(std::is_same_v<T, wchar_t> && sizeof(wchar_t) ==
sizeof(char32_t))
struct utf_t<T> {
utf_t() {
}
template <typename Input>
static auto length(Input begin, Input const end) -> unsigned;
};
template <typename T>
requires (std::is_same_v<T, char32_t>) ||
(std::is_same_v<T, wchar_t> && sizeof(wchar_t) ==
sizeof(char32_t))
template <typename Input>
inline auto utf_t<T>::length(Input begin, Input const end) -> unsigned {
return 0;
}
$ clang++ -std=c++20 utf.cpp
utf.cpp:21:23: error: out-of-line definition of 'length' from class
'utf_t<type-parameter-0-0>' without definition
inline auto utf_t<T>::length(Input begin, Input const end) -> unsigned {
~~~~~~~~~~^
1 error generated.
No matter how you constrain it, it doesn't work:
https://godbolt.org/z/qqaM89nTx
GCC compiles it without any error: https://godbolt.org/z/PM3seoYvW
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
