text: // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you 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.
  
  // Authors: Ge,Jun (gejun@baidu.com)
  
  #include <unistd.h>                    // write, _exit
  #include <gflags/gflags.h>
  #include "butil/macros.h"
  #include "brpc/reloadable_flags.h"
  
  namespace brpc {
  
  bool PassValidate(const char*, bool) {
      return true;
  }
  bool PassValidate(const char*, int32_t) {
      return true;
  }
  bool PassValidate(const char*, int64_t) {
      return true;
  }
  bool PassValidate(const char*, uint64_t) {
      return true;
  }
  bool PassValidate(const char*, double) {
      return true;
  }
  
  bool PositiveInteger(const char*, int32_t val) {
      return val > 0;
  }
  bool PositiveInteger(const char*, int64_t val) {
      return val > 0;
  }
  
  bool NonNegativeInteger(const char*, int32_t val) {
      return val >= 0;
  }
  bool NonNegativeInteger(const char*, int64_t val) {
      return val >= 0;
  }
  
  template <typename T>
  static bool RegisterFlagValidatorOrDieImpl(
      const T* flag, bool (*validate_fn)(const char*, T val)) {
      if (GFLAGS_NS::RegisterFlagValidator(flag, validate_fn)) {
          return true;
      }
      // Error printed by gflags does not have newline. Add one to it.
      char newline = '\n';
      butil::ignore_result(write(2, &newline, 1));
      _exit(1);
  }
  
  bool RegisterFlagValidatorOrDie(const bool* flag,
                                  bool (*validate_fn)(const char*, bool)) {
      return RegisterFlagValidatorOrDieImpl(flag, validate_fn);
  }
  bool RegisterFlagValidatorOrDie(const int32_t* flag,
                                  bool (*validate_fn)(const char*, int32_t)) {
      return RegisterFlagValidatorOrDieImpl(flag, validate_fn);
  }
  bool RegisterFlagValidatorOrDie(const int64_t* flag,
                                  bool (*validate_fn)(const char*, int64_t)) {
      return RegisterFlagValidatorOrDieImpl(flag, validate_fn);
  }
  bool RegisterFlagValidatorOrDie(const uint64_t* flag,
                                  bool (*validate_fn)(const char*, uint64_t)) {
      return RegisterFlagValidatorOrDieImpl(flag, validate_fn);
  }
  bool RegisterFlagValidatorOrDie(const double* flag,
                                  bool (*validate_fn)(const char*, double)) {
      return RegisterFlagValidatorOrDieImpl(flag, validate_fn);
  }
  
  } // namespace brpc
  