creating vector of bson_t pointers causes warning: "ignoring attributes on template argument ‘bson_t {aka _bson_t*}’ [-Wignored-attributes]"*

Example of code:

#include <iostream>
#include <bson.h>
#include <vector>

using namespace std;

int
main( int argc, char **argv){
    bson_t *doc = bson_new();
    bson_init( doc );    std::vector<bson_t *> v;
    v.push_back(doc);
    bson_t *doc2 = v.back();
    v.pop_back();
    bson_destroy(doc2);    return 0;
}

test_bson_vec.c:13:25: warning: ignoring attributes on template argument ‘bson_t* {aka _bson_t*}’ [-Wignored-attributes]
std::vector<bson_t *> v;