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Let Me Google That For You: "ros publisher number subscribers".

Fourth result: uint32_t ros::Publisher::getNumSubscribers() const.

Let Me Google That For You: "ros publisher number subscribers".

~~Fourth~~ Fifth result: uint32_t ros::Publisher::getNumSubscribers() const.

~~Let Me Google That For You: "ros publisher number subscribers".~~

Fifth result: uint32_t ros::Publisher::getNumSubscribers() const.

uint32_t ros::Publisher::getNumSubscribers() const.

uint32_t ros::Publisher::getNumSubscribers() const

Returns the number of subscribers that are currently connected to this Publisher.

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