## 23.2 The Fundamental Containers (cont.)

C'tors
  Default creates an empty container
  Integer arg. creates container with size elements, initialized to default value
  - 2nd form allows explicit initialization. Same for all elements
  Can be initialized with another collection
`at`
  checks for index validity, unlike `operator[]`
`front`, `back`
  return the first and last elements
`empty`
  returns `true` if container has no elements

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