Squashed 'third_party/glog/' content from commit 9ef754a3023

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src/glog/log_severity.h

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+// Copyright (c) 2007, 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.
+
+#ifndef BASE_LOG_SEVERITY_H__
+#define BASE_LOG_SEVERITY_H__
+
+// The recommended semantics of the log levels are as follows:
+//
+// INFO:
+//   Use for state changes or other major events, or to aid debugging.
+// WARNING:
+//   Use for undesired but relatively expected events, which may indicate a
+//   problem
+// ERROR:
+//   Use for undesired and unexpected events that the program can recover from.
+//   All ERRORs should be actionable - it should be appropriate to file a bug
+//   whenever an ERROR occurs in production.
+// FATAL:
+//   Use for undesired and unexpected events that the program cannot recover
+//   from. 
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// Variables of type LogSeverity are widely taken to lie in the range
+// [0, NUM_SEVERITIES-1].  Be careful to preserve this assumption if
+// you ever need to change their values or add a new severity.
+typedef int LogSeverity;
+
+const int GLOG_INFO = 0, GLOG_WARNING = 1, GLOG_ERROR = 2, GLOG_FATAL = 3,
+  NUM_SEVERITIES = 4;
+#ifndef GLOG_NO_ABBREVIATED_SEVERITIES
+# ifdef ERROR
+#  error ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
+# endif
+const int INFO = GLOG_INFO, WARNING = GLOG_WARNING,
+  ERROR = GLOG_ERROR, FATAL = GLOG_FATAL;
+#endif
+
+// DFATAL is FATAL in debug mode, ERROR in normal mode
+#ifdef NDEBUG
+#define DFATAL_LEVEL ERROR
+#else
+#define DFATAL_LEVEL FATAL
+#endif
+
+extern GOOGLE_GLOG_DLL_DECL const char* const LogSeverityNames[NUM_SEVERITIES];
+
+// NDEBUG usage helpers related to (RAW_)DCHECK:
+//
+// DEBUG_MODE is for small !NDEBUG uses like
+//   if (DEBUG_MODE) foo.CheckThatFoo();
+// instead of substantially more verbose
+//   #ifndef NDEBUG
+//     foo.CheckThatFoo();
+//   #endif
+//
+// IF_DEBUG_MODE is for small !NDEBUG uses like
+//   IF_DEBUG_MODE( string error; )
+//   DCHECK(Foo(&error)) << error;
+// instead of substantially more verbose
+//   #ifndef NDEBUG
+//     string error;
+//     DCHECK(Foo(&error)) << error;
+//   #endif
+//
+#ifdef NDEBUG
+enum { DEBUG_MODE = 0 };
+#define IF_DEBUG_MODE(x)
+#else
+enum { DEBUG_MODE = 1 };
+#define IF_DEBUG_MODE(x) x
+#endif
+
+#endif  // BASE_LOG_SEVERITY_H__