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One way would be to create two custom messages, call them something like my_msgs/Pair.msg and my_msgs/VectorPair.msg. The contents would be:

my_msgs/Pair.msg

int a
int b

my_msgs/VectorPair.msg

my_msgs/Pair[] data

In your publishing node you would do:

#include <my_msgs/VectorPair.h>
vector_pub = nh.advertise<my_msgs::VectorPair>("vector", 100);
my_msgs::VectorPair vector_node_position;
vector_node_position.data[0].a = 1;
vector_node_position.data[0].b = 2;
vector_pub.publish(vector_node_position);

One way would be to create two custom messages, call them something like my_msgs/Pair.msg and my_msgs/VectorPair.msg. The contents would be:

my_msgs/Pair.msg

int a
int b

my_msgs/VectorPair.msg

my_msgs/Pair[] data

In your publishing node you would do:

#include <my_msgs/VectorPair.h>
vector_pub = nh.advertise<my_msgs::VectorPair>("vector", 100);
my_msgs Pair pair;
my_msgs::VectorPair vector_node_position;
vector_node_position.data[0].a pair.a = 1;
vector_node_position.data[0].b pair.b = 2;
vector_node_position.data.push_back(pair);
vector_pub.publish(vector_node_position);