Tested it with the following source code:

#include <iostream>
#include <pcl/point_cloud.h>
#include <pcl/point_types.h>

int main() {
    pcl::PointCloud<pcl::PointXYZ> cloud;

    // Create 5 sample points
    cloud.width = 5;
    cloud.height = 1;
    cloud.points.resize(cloud.width * cloud.height);

    for (std::size_t i = 0; i < cloud.points.size(); ++i) {
        cloud.points[i].x = 1024 * rand() / (RAND_MAX + 1.0f);
        cloud.points[i].y = 1024 * rand() / (RAND_MAX + 1.0f);
        cloud.points[i].z = 1024 * rand() / (RAND_MAX + 1.0f);
    }

    std::cout << "Generated " << cloud.points.size()
              << " points:" << std::endl;

    for (const auto& point : cloud.points) {
        std::cout << "("
                  << point.x << ", "
                  << point.y << ", "
                  << point.z << ")" << std::endl;
    }

    return 0;
}

compiled and executed:

$ g++ test_pcl.cpp -o test_pcl $(pkg-config --cflags --libs pcl_common pcl_io)
$ ./test_pcl 
Generated 5 points:
(0.352222, -0.151883, -0.106395)
(-0.397406, -0.473106, 0.292602)
(-0.731898, 0.667105, 0.441304)
(-0.734766, 0.854581, -0.0361733)
(-0.4607, -0.277468, -0.916762)