Nifty iterators

Couple of different ways of iterating over collections:

The long way

for (collection<T>::iterator it = t.begin(); it != t.end(); ++it)
{
 // Do stuff with *it
}

With template functions

void function(const T& t)
{
 // Do stuff with t
}
std::for_each(t.begin(), t.end(), function);

c++11 lambdas

std::for_each(t.begin(), t.end(), [](const T&) { // Do stuff with t });

Or just over a collection

for (const T& value, t)
{
  // Do stuff with value
}

Of these, the first one frustrates me sometimes since you need to know what type of collection you’re iterating over. Thankfully c++11 introduced type inference with the auto keyword. Means you can instead write

for (auto it = t.begin(); it != t.end(); ++it)
{
 // Do stuff with *it
}