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* [gcc r11-9294] libstdc++: Support printing volatile pointers (P1147R1)
@ 2021-11-24 11:51 Jonathan Wakely
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From: Jonathan Wakely @ 2021-11-24 11:51 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:58752dd237e95d06c080c7669f039a2c7cfac938
commit r11-9294-g58752dd237e95d06c080c7669f039a2c7cfac938
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon Oct 4 15:22:00 2021 +0100
libstdc++: Support printing volatile pointers (P1147R1)
To avoid needing to export a new symbol from the library (for now) the
new member function uses __attribute__((always_inline)).
libstdc++-v3/ChangeLog:
* include/std/ostream (operator<<(const volatile void*)):
Add new overload, as per P1147R1.
* testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc:
New test.
(cherry picked from commit 96955a82f0e1624a20ea2c9953d76a20ea433c24)
Diff:
---
libstdc++-v3/include/std/ostream | 7 +++++++
.../27_io/basic_ostream/inserters_other/char/volatile_ptr.cc | 11 +++++++++++
2 files changed, 18 insertions(+)
diff --git a/libstdc++-v3/include/std/ostream b/libstdc++-v3/include/std/ostream
index 981697324c9..722d4ff61b5 100644
--- a/libstdc++-v3/include/std/ostream
+++ b/libstdc++-v3/include/std/ostream
@@ -251,6 +251,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return *this << "nullptr"; }
#endif
+#if __cplusplus > 202002L
+ __attribute__((__always_inline__))
+ __ostream_type&
+ operator<<(const volatile void* __p)
+ { return _M_insert(const_cast<const void*>(__p)); }
+#endif
+
/**
* @brief Extracting from another streambuf.
* @param __sb A pointer to a streambuf
diff --git a/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc b/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc
new file mode 100644
index 00000000000..1b1a9434a95
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc
@@ -0,0 +1,11 @@
+// { dg-options "-std=gnu++23 -fno-inline" }
+// { dg-do link { target c++23 } }
+
+#include <iostream>
+
+int main()
+{
+ int i = 0;
+ volatile void* p = &i;
+ std::cout << p << std::endl;
+}
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