c++ 11 and above enum

• grammar

enum [identifier] [: type] {
  ...,
  ...,
};

• example

namespace costmap_2d {
/**
 * @brief TALL_OBSTACLE for 3d nav
 */
enum: unsigned char {
    TALL_OBSTACLE = 252,
};
}

• example 2

enum class A {
    A = 3,
    B = 10,
};

A somea = A::A;

• see also
  • https://yuiwong.org/gitlab/cpp/cpp-basics
  • cpp11enumdemo.cpp
  • https://yuiwong.org/2017/05/13/enum/