/usr/include/glog/stl_logging.h is in libgoogle-glog-dev 0.3.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | // Copyright (c) 2003, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Stream output operators for STL containers; to be used for logging *only*.
// Inclusion of this file lets you do:
//
// list<string> x;
// LOG(INFO) << "data: " << x;
// vector<int> v1, v2;
// CHECK_EQ(v1, v2);
#ifndef UTIL_GTL_STL_LOGGING_INL_H_
#define UTIL_GTL_STL_LOGGING_INL_H_
#if !1
# error We do not support stl_logging for this compiler
#endif
#include <deque>
#include <list>
#include <map>
#include <ostream>
#include <set>
#include <utility>
#include <vector>
#ifdef __GNUC__
# include <ext/hash_set>
# include <ext/hash_map>
# include <ext/slist>
#endif
// Forward declare these two, and define them after all the container streams
// operators so that we can recurse from pair -> container -> container -> pair
// properly.
template<class First, class Second>
std::ostream& operator<<(std::ostream& out, const std::pair<First, Second>& p);
namespace google {
template<class Iter>
void PrintSequence(std::ostream& out, Iter begin, Iter end);
}
#define OUTPUT_TWO_ARG_CONTAINER(Sequence) \
template<class T1, class T2> \
inline std::ostream& operator<<(std::ostream& out, \
const Sequence<T1, T2>& seq) { \
google::PrintSequence(out, seq.begin(), seq.end()); \
return out; \
}
OUTPUT_TWO_ARG_CONTAINER(std::vector)
OUTPUT_TWO_ARG_CONTAINER(std::deque)
OUTPUT_TWO_ARG_CONTAINER(std::list)
#ifdef __GNUC__
OUTPUT_TWO_ARG_CONTAINER(__gnu_cxx::slist)
#endif
#undef OUTPUT_TWO_ARG_CONTAINER
#define OUTPUT_THREE_ARG_CONTAINER(Sequence) \
template<class T1, class T2, class T3> \
inline std::ostream& operator<<(std::ostream& out, \
const Sequence<T1, T2, T3>& seq) { \
google::PrintSequence(out, seq.begin(), seq.end()); \
return out; \
}
OUTPUT_THREE_ARG_CONTAINER(std::set)
OUTPUT_THREE_ARG_CONTAINER(std::multiset)
#undef OUTPUT_THREE_ARG_CONTAINER
#define OUTPUT_FOUR_ARG_CONTAINER(Sequence) \
template<class T1, class T2, class T3, class T4> \
inline std::ostream& operator<<(std::ostream& out, \
const Sequence<T1, T2, T3, T4>& seq) { \
google::PrintSequence(out, seq.begin(), seq.end()); \
return out; \
}
OUTPUT_FOUR_ARG_CONTAINER(std::map)
OUTPUT_FOUR_ARG_CONTAINER(std::multimap)
#ifdef __GNUC__
OUTPUT_FOUR_ARG_CONTAINER(__gnu_cxx::hash_set)
OUTPUT_FOUR_ARG_CONTAINER(__gnu_cxx::hash_multiset)
#endif
#undef OUTPUT_FOUR_ARG_CONTAINER
#define OUTPUT_FIVE_ARG_CONTAINER(Sequence) \
template<class T1, class T2, class T3, class T4, class T5> \
inline std::ostream& operator<<(std::ostream& out, \
const Sequence<T1, T2, T3, T4, T5>& seq) { \
google::PrintSequence(out, seq.begin(), seq.end()); \
return out; \
}
#ifdef __GNUC__
OUTPUT_FIVE_ARG_CONTAINER(__gnu_cxx::hash_map)
OUTPUT_FIVE_ARG_CONTAINER(__gnu_cxx::hash_multimap)
#endif
#undef OUTPUT_FIVE_ARG_CONTAINER
template<class First, class Second>
inline std::ostream& operator<<(std::ostream& out,
const std::pair<First, Second>& p) {
out << '(' << p.first << ", " << p.second << ')';
return out;
}
namespace google {
template<class Iter>
inline void PrintSequence(std::ostream& out, Iter begin, Iter end) {
// Output at most 100 elements -- appropriate if used for logging.
for (int i = 0; begin != end && i < 100; ++i, ++begin) {
if (i > 0) out << ' ';
out << *begin;
}
if (begin != end) {
out << " ...";
}
}
}
// Note that this is technically undefined behavior! We are adding things into
// the std namespace for a reason though -- we are providing new operations on
// types which are themselves defined with this namespace. Without this, these
// operator overloads cannot be found via ADL. If these definitions are not
// found via ADL, they must be #included before they're used, which requires
// this header to be included before apparently independent other headers.
//
// For example, base/logging.h defines various template functions to implement
// CHECK_EQ(x, y) and stream x and y into the log in the event the check fails.
// It does so via the function template MakeCheckOpValueString:
// template<class T>
// void MakeCheckOpValueString(strstream* ss, const T& v) {
// (*ss) << v;
// }
// Because 'glog/logging.h' is included before 'glog/stl_logging.h',
// subsequent CHECK_EQ(v1, v2) for vector<...> typed variable v1 and v2 can only
// find these operator definitions via ADL.
//
// Even this solution has problems -- it may pull unintended operators into the
// namespace as well, allowing them to also be found via ADL, and creating code
// that only works with a particular order of includes. Long term, we need to
// move all of the *definitions* into namespace std, bet we need to ensure no
// one references them first. This lets us take that step. We cannot define them
// in both because that would create ambiguous overloads when both are found.
namespace std { using ::operator<<; }
#endif // UTIL_GTL_STL_LOGGING_INL_H_
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