src/logging.h

// Copyright 2010 Google
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_LOGGING_H_
#define SRC_LOGGING_H_

#include <cstdlib>
#include <iostream>  // NOLINT
#include "src/macros.h"

#define CHECK(x) \
  if (!(x)) LogMessageFatal(__FILE__, __LINE__).stream() << "Check failed: " #x
#define CHECK_EQ(x, y) CHECK((x) == (y))
#define CHECK_NE(x, y) CHECK((x) != (y))
#define CHECK_LE(x, y) CHECK((x) <= (y))
#define CHECK_LT(x, y) CHECK((x) < (y))
#define CHECK_GE(x, y) CHECK((x) >= (y))
#define CHECK_GT(x, y) CHECK((x) > (y))

#ifndef NDEBUG

#define DCHECK(x) CHECK(x)
#define DCHECK_EQ(x, y) CHECK_EQ(x, y)
#define DCHECK_NE(x, y) CHECK_NE(x, y)
#define DCHECK_LE(x, y) CHECK_LE(x, y)
#define DCHECK_LT(x, y) CHECK_LT(x, y)
#define DCHECK_GE(x, y) CHECK_GE(x, y)
#define DCHECK_GT(x, y) CHECK_GT(x, y)

#else  // NDEBUG

#define DCHECK(condition) \
  while (false) \
    CHECK(condition)

#define DCHECK_EQ(val1, val2) \
  while (false) \
    CHECK_EQ(val1, val2)

#define DCHECK_NE(val1, val2) \
  while (false) \
    CHECK_NE(val1, val2)

#define DCHECK_LE(val1, val2) \
  while (false) \
    CHECK_LE(val1, val2)

#define DCHECK_LT(val1, val2) \
  while (false) \
    CHECK_LT(val1, val2)

#define DCHECK_GE(val1, val2) \
  while (false) \
    CHECK_GE(val1, val2)

#define DCHECK_GT(val1, val2) \
  while (false) \
    CHECK_GT(val1, val2)

#define DCHECK_STREQ(str1, str2) \
  while (false) \
    CHECK_STREQ(str1, str2)

#endif

#define LOG_INFO LogMessage(__FILE__, __LINE__)
#define LOG(severity) LOG_ ## severity.stream()
#define LG LOG(INFO)

class LogMessage {
 public:
  LogMessage(const char* file, int line) {}
  ~LogMessage() { std::cerr << "\n"; }
  std::ostream& stream() { return std::cerr; }
 private:
  DISALLOW_COPY_AND_ASSIGN(LogMessage);
};

class LogMessageFatal : public LogMessage {
 public:
  LogMessageFatal(const char* file, int line)
    : LogMessage(file, line) {}
  ~LogMessageFatal() {
    std::cerr << "\n";
    std::abort();
  }
 private:
  DISALLOW_COPY_AND_ASSIGN(LogMessageFatal);
};

#endif  // SRC_LOGGING_H_