Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Class template array
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Class template array

boost::array —

STL compliant container wrapper for arrays of constant size

Synopsis

template<typename T, std::size_t N> 
class array {
public:
  // types
  typedef T                                     value_type;            
  typedef T*                                    iterator;              
  typedef const T*                              const_iterator;        
  typedef std::reverse_iterator<iterator>       reverse_iterator;      
  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
  typedef T&                                    reference;             
  typedef const T&                              const_reference;       
  typedef std::size_t                           size_type;             
  typedef std::ptrdiff_t                        difference_type;       

  // static constants
  static const size_type static_size = N;

  // construct/copy/destruct
  template<typename U> array& operator=(const array<U, N>&);

  // iterator support
  iterator begin();
  const_iterator begin() const;
  iterator end();
  const_iterator end() const;

  // reverse iterator support
  reverse_iterator rbegin();
  const_reverse_iterator rbegin() const;
  reverse_iterator rend();
  const_reverse_iterator rend() const;

  // capacity
  size_type size();
  bool empty();
  size_type max_size();

  // element access
  reference operator[](size_type);
  const_reference operator[](size_type) const;
  reference at(size_type);
  const_reference at(size_type) const;
  reference front();
  const_reference front() const;
  reference back();
  const_reference back() const;
  const T* data() const;
  T* c_array();

  // modifiers
  void swap(array<T, N>&);
  void assign(const T&);

  T elems[N];
};

// specialized algorithms
template<typename T, std::size_t N> void swap(array<T, N>&, array<T, N>&);

// comparisons
template<typename T, std::size_t N> 
  bool operator==(const array<T, N>&, const array<T, N>&);
template<typename T, std::size_t N> 
  bool operator!=(const array<T, N>&, const array<T, N>&);
template<typename T, std::size_t N> 
  bool operator<(const array<T, N>&, const array<T, N>&);
template<typename T, std::size_t N> 
  bool operator>(const array<T, N>&, const array<T, N>&);
template<typename T, std::size_t N> 
  bool operator<=(const array<T, N>&, const array<T, N>&);
template<typename T, std::size_t N> 
  bool operator>=(const array<T, N>&, const array<T, N>&);

Description

array construct/copy/destruct

  1. template<typename U> array& operator=(const array<U, N>& other);
    Effects: std::copy(rhs.begin(),rhs.end(), begin())

array iterator support

  1. iterator begin();
const_iterator begin() const;
    Returns: iterator for the first element
    Throws: will not throw 

  2. iterator end();
const_iterator end() const;
    Returns: iterator for position after the last element
    Throws: will not throw

array reverse iterator support

  1. reverse_iterator rbegin();
const_reverse_iterator rbegin() const;
    Returns: reverse iterator for the first element of reverse iteration 

  2. reverse_iterator rend();
const_reverse_iterator rend() const;
    Returns: reverse iterator for position after the last element in reverse iteration

array capacity

  1. size_type size();
    Returns: N 
  2. bool empty();
    Returns: N==0
    Throws: will not throw 
  3. size_type max_size();
    Returns: N
    Throws: will not throw

array element access

  1. reference operator[](size_type i);
const_reference operator[](size_type i) const;
    Requires: i < N
    Returns: element with index i
    Throws: will not throw. 

  2. reference at(size_type i);
const_reference at(size_type i) const;
    Returns: element with index i
    Throws: std::range_error if i >= N 

  3. reference front();
const_reference front() const;
    Requires: N > 0
    Returns: the first element
    Throws: will not throw 

  4. reference back();
const_reference back() const;
    Requires: N > 0
    Returns: the last element
    Throws: will not throw 
  5. const T* data() const;
    Returns: elems
    Throws: will not throw 
  6. T* c_array();
    Returns: elems
    Throws: will not throw

array modifiers

  1. void swap(array<T, N>& other);
    Effects: std::swap_ranges(begin(), end(), other.begin())
    Complexity: linear in N 
  2. void assign(const T& value);
    Effects: std::fill_n(begin(), N, value)

array specialized algorithms

  1. template<typename T, std::size_t N> void swap(array<T, N>& x, array<T, N>& y);
    Effects: x.swap(y)
    Throws: will not throw.

array comparisons

  1. template<typename T, std::size_t N> 
  bool operator==(const array<T, N>& x, const array<T, N>& y);
    Returns: std::equal(x.begin(), x.end(), y.begin()) 
  2. template<typename T, std::size_t N> 
  bool operator!=(const array<T, N>& x, const array<T, N>& y);
    Returns: !(x == y) 
  3. template<typename T, std::size_t N> 
  bool operator<(const array<T, N>& x, const array<T, N>& y);
    Returns: std::lexicographical_compare(x.begin(), x.end(), y.begin(), y.end()) 
  4. template<typename T, std::size_t N> 
  bool operator>(const array<T, N>& x, const array<T, N>& y);
    Returns: y < x 
  5. template<typename T, std::size_t N> 
  bool operator<=(const array<T, N>& x, const array<T, N>& y);
    Returns: !(y < x) 
  6. template<typename T, std::size_t N> 
  bool operator>=(const array<T, N>& x, const array<T, N>& y);
    Returns: !(x < y)
Copyright © 2001-2004 Nicolai M. Josuttis
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