mclow.lists created this revision.
mclow.lists added reviewers: EricWF, dexonsmith.
https://cplusplus.github.io/LWG/issue2221
This is straightforward; I'm putting it up for review because it will add
symbols to the dylib
https://reviews.llvm.org/D44263
Files:
include/ostream
test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/nullptr.pass.cpp
Index: test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/nullptr.pass.cpp
===================================================================
--- test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/nullptr.pass.cpp
+++ test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/nullptr.pass.cpp
@@ -0,0 +1,80 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <ostream>
+
+// template <class charT, class traits = char_traits<charT> >
+// class basic_ostream;
+
+// template<class charT, class traits>
+// basic_ostream<charT,traits>& operator<<(basic_ostream<charT,traits>& out, nullptr_t);
+//
+
+#include <ostream>
+#include <cassert>
+#include "test_macros.h"
+
+template <class CharT>
+class testbuf
+ : public std::basic_streambuf<CharT>
+{
+ typedef std::basic_streambuf<CharT> base;
+ std::basic_string<CharT> str_;
+public:
+ testbuf()
+ {
+ }
+
+ std::basic_string<CharT> str() const
+ {return std::basic_string<CharT>(base::pbase(), base::pptr());}
+
+protected:
+
+ virtual typename base::int_type
+ overflow(typename base::int_type ch = base::traits_type::eof())
+ {
+ if (ch != base::traits_type::eof())
+ {
+ int n = static_cast<int>(str_.size());
+ str_.push_back(ch);
+ str_.resize(str_.capacity());
+ base::setp(const_cast<CharT*>(str_.data()),
+ const_cast<CharT*>(str_.data() + str_.size()));
+ base::pbump(n+1);
+ }
+ return ch;
+ }
+};
+
+int main()
+{
+ {
+ std::wostream os((std::wstreambuf*)0);
+ os << nullptr;
+ assert(os.bad());
+ assert(os.fail());
+ }
+ {
+ testbuf<char> sb;
+ std::ostream os(&sb);
+ assert(sb.str().length() == 0);
+ os << nullptr;
+ assert(sb.str().length() > 0);
+ LIBCPP_ASSERT(sb.str() == "(nullptr)"); // output is an implementation-defined NTCTS
+ }
+
+ {
+ testbuf<wchar_t> sb;
+ std::wostream os(&sb);
+ assert(sb.str().length() == 0);
+ os << nullptr;
+ assert(sb.str().length() > 0);
+ LIBCPP_ASSERT(sb.str() == L"(nullptr)"); // output is an implementation-defined NTCTS
+ }
+}
Index: include/ostream
===================================================================
--- include/ostream
+++ include/ostream
@@ -56,6 +56,7 @@
basic_ostream& operator<<(double f);
basic_ostream& operator<<(long double f);
basic_ostream& operator<<(const void* p);
+ basic_ostream<charT, traits>& operator<<(nullptr_t); // C++17
basic_ostream& operator<<(basic_streambuf<char_type,traits>* sb);
// 27.7.2.7 Unformatted output:
@@ -216,6 +217,7 @@
basic_ostream& operator<<(double __f);
basic_ostream& operator<<(long double __f);
basic_ostream& operator<<(const void* __p);
+ basic_ostream& operator<<(nullptr_t);
basic_ostream& operator<<(basic_streambuf<char_type, traits_type>* __sb);
// 27.7.2.7 Unformatted output:
@@ -709,6 +711,14 @@
return *this;
}
+template <class _CharT, class _Traits>
+basic_ostream<_CharT, _Traits>&
+basic_ostream<_CharT, _Traits>::operator<<(nullptr_t)
+{
+ return *this << "(nullptr)";
+}
+
+
template<class _CharT, class _Traits>
basic_ostream<_CharT, _Traits>&
__put_character_sequence(basic_ostream<_CharT, _Traits>& __os,
@@ -742,7 +752,6 @@
return __os;
}
-
template<class _CharT, class _Traits>
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, _CharT __c)
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