no suitable conversion function from "const sgx_request_t" to "const sgx_request_t*" exists

I am a novice in c++ world and I am running into a problem which I have been trying to solve for some days on my own and through google and I could not find a solution. I want to use the method below:

sgx_status_t sgx_get_key(const sgx_key_request_t* 
                        key_request,sgx_key_128bit_t *key); 

Data structure of sgx_key_request according to documentation is as below

typedef struct _key_request_t {

uint16_t key_name;

uint16_t key_policy;

sgx_isv_svn_t isv_svn;

uint16_t    reserved1;

sgx_cpu_svn_t cpu_svn;

sgx_attributes_t attribute_mask;

sgx_key_id_t key_id;

sgx_misc_select_t misc_mask;

sgx_config_svn_t config_svn

uint8_t reserved2[434]

} sgx_key_request_t;

I tried to use the method above as according to the documentation as below

typedef struct _key_request_t {

    uint16_t key_name;

    uint16_t key_policy;

    sgx_isv_svn_t isv_svn;

    uint16_t    reserved1;

    sgx_cpu_svn_t cpu_svn;

    sgx_attributes_t attribute_mask;

    sgx_key_id_t key_id ;

    sgx_misc_select_t misc_mask;

    sgx_config_svn_t config_svn;

    uint8_t reserved2[434];

} sgx_key_request_t;

const sgx_key_request_t keyRequest{
    SGX_KEYSELECT_EINITTOKEN,
    SGX_KEYPOLICY_MRENCLAVE,
    0,
    0,
    0,
    0,
    0,
    0xFFFFFFFF,
    0,
   {0}
};

sgx_key_128bit_t *key;


sgx_status_t ret = sgx_get_key(keyRequest, key);

I have some compile error here as below:

'_key_request_t': 'struct' type redefinition
'keyRequest' uses undefined struct '_key_request_t'   
'sgx_status_t sgx_get_key(const sgx_key_request_t *,sgx_key_128bit_t (*))': cannot convert argument 1 from 'int' to 'const sgx_key_request_t *'   

I have tried to figure it out but I am coming from a JAVA world and there are new keyword in c++ which I am still not familiar with. I know I would have put some time on learning c++ but my deadlines did not give me that luxury. I would appreciate any positive and negative comments