编译hello world
# 进入到源码目录
mkdir -p examples/cpp/hello_world/build
cd examples/cpp/hello_world/build
cmake .. && make -j4
运行publisher
./hello_world publisher
运行subscriber
./hello_world subscriber
# 进入到源码目录
mkdir -p examples/cpp/hello_world/build
cd examples/cpp/hello_world/build
cmake .. && make -j4
./hello_world publisher
./hello_world subscriber