Here is some examples of how to use std::vector with string for most of the common operations that can be performed on std::vector.

The following example assume the following has been declared

std::vector<std::string> vec;

Adding Items

vec.push_back("Item 1");
vec.push_back("Item 2");
vec.push_back("Item 3");
vec.push_back("Item 4");
vec.push_back("Item 5");

Adding Items to front

vec.insert(vec.begin(), "Front 2");
vec.insert(vec.begin(), "Front 1");

Remove Last Item

vec.pop_back();

Remove Last Item

vec.erase(vec.end());

Remove First Item

vec.erase(vec.begin());

Process All Items

for(std::vector<std::string>::iterator it = vec.begin(); it != vec.end(); it++)
{
  printf("%s\n", it->c_str());
}

Process All Items

for(size_t i = 0; i < vec.size(); i++)
{
  printf("%s\n", vec[i].c_str());
}

Reverse The Order - Note you can also just run the above backwards instead.

for(size_t i = 0; i < vec.size() / 2; i++)
{
  std::string tmp = vec[i];
  vec[i] = vec[vec.size() - i - 1];
  vec[vec.size() - i - 1] = tmp;
}

Sorting

std::sort(vec.begin(), vec.end());

Find and Remove an item

for(std::vector<std::string>::iterator it = vec.begin(); it != vec.end(); it++)
{
  if (*it == "Item 2")
  {
    vec.erase(it);
    break;	//it is now invalud must break!
  }
}

Clear All Items

vec.clear();

This is a quick guide to adding emergancy swap space to linux. Which is useful when you know a machine is going to run out memory. Or you need a lot of memory for a single task that cannot be completed without the extra memory.

Step 1

Login as root

Step 2

Create a new file of the size that you want to add using the following command. In this case 512 mbytes of space.

dd if=/dev/zero of=/extraswap1 bs=1024 count=512k

Step 3

Fix the permissions on the file so that only the creator can read / write to it.

chmod 0600 /extraswap1

Step 4

Turn it into a swap file and tell linux to turn on the extra space

mkswap /extraswap1

swapon /extraswap1

Step 5

If you want the swap to be enabled after the next reboot of the machine you will need to add the following line to /etc/fstab

/extraswap1 swap swap defaults 0 0

Finally

You can verify that it is working by either using free or by looking directly at the proc filesystem using cat /proc/swaps