1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <ostream>
10
11// template <class charT, class traits = char_traits<charT> >
12// class basic_ostream;
13
14// operator<<(const void* val);
15
16#include <ostream>
17#include <cassert>
18
19#include "test_macros.h"
20
21template <class CharT>
22class testbuf
23 : public std::basic_streambuf<CharT>
24{
25 typedef std::basic_streambuf<CharT> base;
26 std::basic_string<CharT> str_;
27public:
28 testbuf()
29 {
30 }
31
32 std::basic_string<CharT> str() const
33 {return std::basic_string<CharT>(base::pbase(), base::pptr());}
34
35protected:
36
37 virtual typename base::int_type
38 overflow(typename base::int_type ch = base::traits_type::eof())
39 {
40 if (ch != base::traits_type::eof())
41 {
42 int n = static_cast<int>(str_.size());
43 str_.push_back(static_cast<CharT>(ch));
44 str_.resize(str_.capacity());
45 base::setp(const_cast<CharT*>(str_.data()),
46 const_cast<CharT*>(str_.data() + str_.size()));
47 base::pbump(n+1);
48 }
49 return ch;
50 }
51};
52
53int main(int, char**)
54{
55 {
56 std::ostream os((std::streambuf*)0);
57 const void* n = 0;
58 os << n;
59 assert(os.bad());
60 assert(os.fail());
61 }
62 {
63 testbuf<char> sb1;
64 std::ostream os1(&sb1);
65 int n1;
66 os1 << &n1;
67 assert(os1.good());
68 std::string s1(sb1.str());
69
70 testbuf<char> sb2;
71 std::ostream os2(&sb2);
72 int n2;
73 os2 << &n2;
74 assert(os2.good());
75 std::string s2(sb2.str());
76
77 // %p is implementation defined. Instead of validating the
78 // output, at least ensure that it does not generate an empty
79 // string. Also make sure that given two distinct addresses, the
80 // output of %p is different.
81 assert(!s1.empty());
82 assert(!s2.empty());
83 assert(s1 != s2);
84 }
85 {
86 testbuf<char> sb;
87 std::ostream os(&sb);
88 const void* n = &sb;
89 os << n;
90 assert(os.good());
91 }
92
93 return 0;
94}
95

source code of libcxx/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/pointer.pass.cpp