Vectors deleting memory without loosing data

[rainjack]

hi,

This function is used to store some data into the stl vector, after store it using push_back, and i will delete the allocated memory using delete [], but did it also delete the data i have store previously ? This function will run several time to store all the data .

void store_specsetvalue(char *d)
{
char *value ;

value= new char[strlen(d) + 1];

if (!value)
{
printf (" Memory Allocation Failure.\n");
exit (1);
}
strcpy (value, d);

specsetvalue.push_back(value);

if(value != NULL)
delete []value;
}

if i did not delete the value that i have create, it will lead to memory leak, so how i delete the memory allocate without loosing the data i have store in the vector ?

Thanks.. a lot .

[D_C]

Vectors have capacity. Even though you remove elements, it still keeps the memory and capacity. Even when you clear the vector, it keeps the memory. To completely empty a vector, swap it with an empty vector, and then it will have 0 capacity.

[Banfa]

I suspect you have a vector of char * vector<char *>. This means that all the vector stores is a pointer so if you delete value after the push_back then you delete the memory that the vector points to.

A memory leak only occurs if you remove all references to a piece of allocated memory without deallocating it. You will not have a memory leak if you don't free value, but you will need to be careful about deleting entries from the vector. You will need to get the value for the entry you wish to remove from the vector, delete it to remove the allocated memory and then remove the entry from the vector.


D_C I thought vector had a method you could call that reduced allocated memory to the minimum required or that calling empty did that for you.