RFR: 8314488: Compiling the JDK with C++17

[Andrew Haley]

On Thu, 26 Jun 2025 02:01:55 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> I'm hijacking the PR mechanism as a way to discuss new C++17 features that can
> be more easily structured and captured than bare email. Once discussion
> settles down I'll turn the results into HotSpot Style Guide changes. I don't
> intend to integrate any version of this document to the OpenJDK repository.

doc/cpp17-features.md line 412:

> 410: [p0144r0](http://wg21.link/p0144r0)
> 411: [p0217r3](http://wg21.link/p0217r3)
> 412: 

It might well be worth allowing limited used of Structured Bindings. The ability to return a status from an incomplete function is something we've lacked:


std::tuple<double, bool> incomplete_function(double x) {
  if (x >= 0)
    return std::tuple(sqrt(x), true);
  return std::tuple(x, false);
}

  const auto[root, failure] = incomplete_function(d);
  if (failure) {...

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/25992#discussion_r2280326634