<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/154173>154173</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            libc++ <memory> header does not include a required basic_ostream template.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          edfvogel
      </td>
    </tr>
</table>

<pre>
    The following C++20 program compiles with clang++, but not when -stdlib=libc++ is specified:

#include <memory>

#define NK char
#define NT std::char_traits<char>
#define NU int
#define ND std::default_delete<NU>
#define NS std::basic_ostream<NK, NT>
#define WS std::basic_ostream<wchar_t, std::char_traits<wchar_t>>

void f00 (NS& a0, const std::unique_ptr<NU, ND>& a1) {
    static_assert(
 !noexcept(std::operator<< <NK, NT, NU, ND>(a0, a1)),
      "Disallows exceptions");
}

Note that section Section 20.10.2 has:

template<class E, class T, class Y, class D>
basic_ostream<E, T>& operator<<(basic_ostream<E, T>& os, const unique_ptr<Y, D>& p);


Not a big deal.  Just wanted to bring this to your attention.

Thank you,

Ed Vogel


</pre>
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