CODEWITHSUNDEEP
c++structshared-memory
Paulina L
Paulina L

Reputation: 11

How to allocate a struct to shared memory i c++?

I have a vague idea of how to work with shared memory in C and I'm trying to use the same approach in a C++ program. I want to share a struct:

typedef struct 
{
    string passw;
    string encoded;
    string tries;
    char steps;
}gameInfo;

gameInfo *gI;

And this is how I'm trying to do it:

int memory;
memory = shmget(IPC_PRIVATE, sizeof(gameInfo)*max_players, IPC_CREAT | 0600);
if(memory==-1)
    {printf("Shared memory error");}

(Later)

*gI = shmat(memory,NULL,0);

And I get "error: no match for ‘operator=’ (operand types are ‘gameInfo’ and ‘void*’)" errors. What would be the quickest fix?

Upvotes: 0

Views: 247

Answers (1)

Basile Starynkevitch
Basile Starynkevitch

Reputation: 1

Even if you managed to understand how to use placement new, you would not be able to get your example running on Linux using POSIX shared memory from shm_overview(7).

Because std::string is not a POD class and contains internal pointers whose role and behavior is not specified.

Upvotes: 2

Related Questions