// In C, NULL is limited to identifying a null pointer.
// 在C中,它是一个宏
#define NULL ((void *)0)\0 is defined to be a null character - that is a character with all bits set to zero.const
// const表示read-only的变量,和完全意义上的常量还不太一样
The con…
重点解决:避免每次都source ros2环境,每次都要设置ros_domain_id等等设置
Background
ROS 2 relies on the notion of combining workspaces using the shell environment.
ros2 依赖于“组合工作区”这个改变,使用shell 环境来实现
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