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From: "tim at klingt dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/107894] New: [feature request] _GLIBCXX_ASSERTIONS
 for std::optional
Date: Mon, 28 Nov 2022 10:27:51 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 12.1.0
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X-Bugzilla-Who: tim at klingt dot org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107894

            Bug ID: 107894
           Summary: [feature request] _GLIBCXX_ASSERTIONS for
                    std::optional
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tim at klingt dot org
  Target Milestone: ---

`_GLIBCXX_ASSERTIONS` does not enable any API validation for std::optional.
e.g. `operator->` translates to `address_to`:
https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/std/=
optional#L969-L970

libc++ on the other hand has assertions that can detect invalid uses:
https://github.com/llvm/llvm-project/blob/main/libcxx/include/optional#L930=
-L937


it would be great if libstdc++ could perform the same validation=