text: /******************************************************************************
   * Copyright 2017 The Apollo Authors. All Rights Reserved.
   *
   * 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.
   *****************************************************************************/
  
  // Commonly-used macro definitions. Some of them are copied from
  // https://chromium.googlesource.com/chromium/src/base/+/master/macros.h
  
  #ifndef APOLLO_DRIVERS_GNSS_INCLUDE_UTIL_MACROS_H
  #define APOLLO_DRIVERS_GNSS_INCLUDE_UTIL_MACROS_H
  
  #include <cstddef>
  
  // Put this in the declarations for a class to be uncopyable.
  #define DISABLE_COPY(TypeName) \
      TypeName(const TypeName&) = delete
  
  // Put this in the declarations for a class to be unassignable.
  #define DISABLE_ASSIGN(TypeName) \
      void operator=(const TypeName&) = delete
  
  // A macro to disallow the copy constructor and operator= functions.
  // This should be used in the private: declarations for a class.
  #define DISABLE_COPY_AND_ASSIGN(TypeName) \
      DISABLE_COPY(TypeName);               \
      DISABLE_ASSIGN(TypeName)
  
  // A macro to disallow all the implicit constructors, namely the
  // default constructor, copy constructor and operator= functions.
  //
  // This should be used in the private: declarations for a class
  // that wants to prevent anyone from instantiating it. This is
  // especially useful for classes containing only static methods.
  #define DISABLE_IMPLICIT_CONSTRUCTORS(TypeName) \
      TypeName() = delete;                        \
      DISABLE_COPY_AND_ASSIGN(TypeName)
  
  // Creates a thread-safe singleton.
  #define MAKE_SINGLETON(TypeName)   \
  public:                            \
      static TypeName * instance() { \
          static TypeName instance;  \
          return &instance;          \
      }                              \
  private:                           \
      DISABLE_COPY_AND_ASSIGN(TypeName)
  
  namespace apollo {
  
  // array_size(a) returns the number of elements in a.
  template <class T, size_t N>
  constexpr size_t array_size(T (&)[N]) { return N; }
  
  }  // namespace apollo
  
  #endif  // APOLLO_DRIVERS_GNSS_INCLUDE_UTIL_MACROS_H
  