CODEWITHSUNDEEP
c++boostshared-ptrscoped-ptr
om sarathe
om sarathe

Reputation: 1

C++ Boost library - passing Shared pointer to a function

Assuming shared pointer can be created as follows

typedef boost::shared_ptr<Employee_t> srdpointer;     
srdpointer ptr((Employee_t*)malloc(sizeof(Employee_t)),std::ptr_fun(free));

I need to pass the shared pointer which will allocate memory Pointed by the ptr. Something like this. 

void allocateBlocks(int **ptr, int *cnt)
{
    *ptr = (int*)malloc(sizeof(int) * 10);
    *cnt = 10;
    /*do something*/ 
}

int main()
{
    int *p = NULL;
    int count = 0;
    locateBlocks(&p, &count);

    /*do something*/

    free(p);
}

How can I achieve the similar functionality using shared_ptr as shown in above code.

Upvotes: 0

Views: 373

Answers (1)

duselbaer
duselbaer

Reputation: 935

Do you mean something like this? 

void allocateBlocks( boost::shared_ptr<int>& out, int& count )
{
  out.reset(new int[...]);
  count = 10;
}

PS: I suggest having a look at boost::shared_array<> & friends for just allocating arrays dynamically.

PS: Would an std::vector<> also do?

Upvotes: -1

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