extern (C) @nogc nothrow nothrow @nogc   
struct nn_transport  {
extern (C) 
void function() init;
extern (C) 
void function() term;
extern (C) 
int function(void* hint, nn_epbase** epbase) bind;
extern (C) 
int function(void* hint, nn_epbase** epbase) connect;
extern (C) 
nn_optset* function() optset;
}
Transport: