How can I check for existence of element in std::vector, in one line?

Possible Duplicate:
How to find an item in a std::vector?

This is what I'm looking for:

#include <vector>
std::vector<int> foo() {
  // to create and return a vector
  return std::vector<int>();
}
void bar() {
  if (foo().has(123)) { // it's not possible now, but how?
    // do something
  }
}

In other words, I'm looking for a short and simple syntax to validate the existence of an element in a vector. And I don't want to introduce another temporary variable for this vector. Thanks!