non-trivial designated initializers not supported

Question

I have a structure as follows:

struct app_data
{
    int port;
    int ib_port;
    unsigned size;
    int tx_depth;
    int sockfd;
    char *servername;
           


        

Answer 1

This does not work with g++. You are essentially using C constructs with C++. Couple of ways to get around it.

1) Remove the "." and change "=" to ":" when initializing.

#include 

using namespace std;
struct ib_connection
   {
    int x;
   };

   struct ibv_device
   {
   int y;
  };

struct app_data
{
    int port;
    int ib_port;
    unsigned size;
    int tx_depth;
    int sockfd;
    char *servername;
    struct ib_connection local_connection;
    struct ib_connection *remote_connection;
    struct ibv_device *ib_dev;

};

int main()
{

    struct app_data data =
    {
        port : 18515,
        ib_port : 1,
        size : 65536,
        tx_depth : 100,
        sockfd : -1,
        servername : NULL,

        local_connection : {5},
        remote_connection : NULL,
        ib_dev : NULL
    };

   cout << "Hello World" << endl; 

   return 0;
}

2) Use g++ -X c. (Not recommended) or put this code in extern C [Disclaimer, I have not tested this]