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In the roscpp package roscpp/include/ros/common.h has the following defines:

#define ROS_VERSION_MAJOR 1
#define ROS_VERSION_MINOR 4
#define ROS_VERSION_PATCH 5
#define ROS_VERSION_COMBINED(major, minor, patch) (((major) << 20) | ((minor) << 10) | (patch))
#define ROS_VERSION ROS_VERSION_COMBINED(ROS_VERSION_MAJOR, ROS_VERSION_MINOR, ROS_VERSION_PATCH)

#define ROS_VERSION_GE(major1, minor1, patch1, major2, minor2, patch2) (ROS_VERSION_COMBINED(major1, minor1, patch1) >= ROS_VERSION_COMBINED(major2, minor2,\
 patch2))
#define ROS_VERSION_MINIMUM(major, minor, patch) ROS_VERSION_GE(ROS_VERSION_MAJOR, ROS_VERSION_MINOR, ROS_VERSION_PATCH, major, minor, patch)