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Re: [v3 PATCH] Implement LWG 2221, No formatted output operator for nullptr
- From: Jonathan Wakely <jwakely at redhat dot com>
- To: Ville Voutilainen <ville dot voutilainen at gmail dot com>
- Cc: libstdc++ <libstdc++ at gcc dot gnu dot org>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Mon, 4 Dec 2017 23:04:24 +0000
- Subject: Re: [v3 PATCH] Implement LWG 2221, No formatted output operator for nullptr
- Authentication-results: sourceware.org; auth=none
- References: <CAFk2RUa_FkNpgnu3nJw4ZdNnuDx4+tmcM045vuXFhM3pivLp5g@mail.gmail.com>
On 03/12/17 23:08 +0200, Ville Voutilainen wrote:
Tested on Linux-x64.
2017-11-14 Ville Voutilainen <ville.voutilainen@gmail.com>
Implement LWG 2221
* include/std/ostream (operator<<(nullptr_t)): New.
* testsuite/27_io/basic_ostream/inserters_other/char/lwg2221.cc: New.
diff --git a/libstdc++-v3/include/std/ostream b/libstdc++-v3/include/std/ostream
index f7cab03..18011bc 100644
--- a/libstdc++-v3/include/std/ostream
+++ b/libstdc++-v3/include/std/ostream
@@ -245,6 +245,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
operator<<(const void* __p)
{ return _M_insert(__p); }
+#if __cplusplus > 201402L
+ __ostream_type&
+ operator<<(nullptr_t)
+ { return *this << "nullptr"; }
+#endif
As discussed on IRC, this requires a new symbol to be exported for the
std::ostream and std::wostream explicit instantiations, or the new
test will fail to link at -O0.
That should wait for stage 1.