使用C++写一个FLANN匹配器

好的，以下是使用C语言编写FLANN匹配器的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <flann/flann.h>

int main(int argc, char** argv) {
    int rows = 10;
    int cols = 5;
    float* dataset = (float*) malloc(rows * cols * sizeof(float));

    // Fill dataset with random data
    for (int i = 0; i < rows * cols; ++i) {
        dataset[i] = (float) rand() / RAND_MAX;
    }

    // Build index
    flann_index_t index_id = flann_build_index(dataset, rows, cols, FLANN_FLOAT);

    // Query dataset
    int num_queries = 3;
    float* query = (float*) malloc(num_queries * cols * sizeof(float));
    int* indices = (int*) malloc(num_queries * sizeof(int));
    float* dists = (float*) malloc(num_queries * sizeof(float));

    // Fill query with random data
    for (int i = 0; i < num_queries * cols; ++i) {
        query[i] = (float) rand() / RAND_MAX;
    }

    flann_find_nearest_neighbors_index(index_id, query, num_queries, indices, dists, 1, FLANN_CHECKS_UNLIMITED);

    // Print results
    for (int i = 0; i < num_queries; ++i) {
        printf("Query %d: Nearest neighbor index = %d, Distance = %f\n", i, indices[i], dists[i]);
    }

    // Clean up
    flann_free_index(index_id, NULL);
    free(dataset);
    free(query);
    free(indices);
    free(dists);

    return 0;
}

这是一个简单的FLANN匹配器实现，它使用随机数据填充数据集和查询，并打印出每个查询的最近邻居的索引和距离。如果需要使用实际数据进行匹配，请将数据集和查询替换为实际数据。