https://bugs.llvm.org/show_bug.cgi?id=36469
Bug ID: 36469
Summary: std::invoke of std::optional::has_value
pointer-to-member-function fails, due to its class
type being a private base.
Product: libc++
Version: 4.0
Hardware: All
OS: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: ari...@stack.nl
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
The following code snippet:
#include <functional>
#include <optional>
bool testfn(std::optional<int> opt_int) {
return std::invoke(&std::optional<int>::has_value, opt_int);
}
Compiler output (c++ -std=c++1z -c -o test.o test.cc):
test.cc:5:10: error: no matching function for call to 'invoke'
return std::invoke(&std::optional<int>::has_value, opt_int);
^~~~~~~~~~~
/usr/include/c++/v1/functional:2589:1: note: candidate template ignored:
substitution failure [with _Fn = bool
(std::__1::__optional_storage_base<int, false>::*)() const noexcept,
_Args = <std::__1::optional<int> &>]: no type named 'type' in
'std::__1::result_of<bool (std::__1::__optional_storage_base<int,
false>::*&&(std::__1::optional<int> &))() const noexcept>'
invoke(_Fn&& __f, _Args&&... __args)
^
1 error generated.
(I have a hard time reading the error message, but it looks to me like
std::result_of template argument is a zero-argument function that returns a
function.)
Compiler version:
FreeBSD clang version 4.0.0 (tags/RELEASE_400/final 297347) (based on LLVM
4.0.0)
Target: x86_64-unknown-freebsd11.1
Thread model: posix
InstalledDir: /usr/bin
Additionally, the following snippet does not compile, while to me seems valid:
std::optional<int> opt_int;
auto fn_ptr = &std::optional<int>::has_value;
bool manual_invocation = (opt_int.*fn_ptr)();
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