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458 lines
16 KiB
C++
458 lines
16 KiB
C++
/* The following code declares class array,
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* an STL container (as wrapper) for arrays of constant size.
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*
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* See
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* http://www.boost.org/libs/array/
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* for documentation.
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*
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* The original author site is at: http://www.josuttis.com/
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*
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* (C) Copyright Nicolai M. Josuttis 2001.
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*
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* Distributed under the Boost Software License, Version 1.0. (See
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* accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* 9 Jan 2013 - (mtc) Added constexpr
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* 14 Apr 2012 - (mtc) Added support for boost::hash
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* 28 Dec 2010 - (mtc) Added cbegin and cend (and crbegin and crend) for C++Ox compatibility.
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* 10 Mar 2010 - (mtc) fill method added, matching resolution of the standard library working group.
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* See <http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#776> or Trac issue #3168
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* Eventually, we should remove "assign" which is now a synonym for "fill" (Marshall Clow)
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* 10 Mar 2010 - added workaround for SUNCC and !STLPort [trac #3893] (Marshall Clow)
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* 29 Jan 2004 - c_array() added, BOOST_NO_PRIVATE_IN_AGGREGATE removed (Nico Josuttis)
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* 23 Aug 2002 - fix for Non-MSVC compilers combined with MSVC libraries.
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* 05 Aug 2001 - minor update (Nico Josuttis)
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* 20 Jan 2001 - STLport fix (Beman Dawes)
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* 29 Sep 2000 - Initial Revision (Nico Josuttis)
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*
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* Jan 29, 2004
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*/
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#ifndef BOOST_ARRAY_HPP
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#define BOOST_ARRAY_HPP
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#include <boost/detail/workaround.hpp>
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#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
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# pragma warning(push)
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# pragma warning(disable:4996) // 'std::equal': Function call with parameters that may be unsafe
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# pragma warning(disable:4510) // boost::array<T,N>' : default constructor could not be generated
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# pragma warning(disable:4610) // warning C4610: class 'boost::array<T,N>' can never be instantiated - user defined constructor required
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#endif
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#include <cstddef>
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#include <stdexcept>
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#include <boost/assert.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/swap.hpp>
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// Handles broken standard libraries better than <iterator>
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#include <boost/detail/iterator.hpp>
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#include <boost/throw_exception.hpp>
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#include <algorithm>
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// FIXES for broken compilers
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#include <boost/config.hpp>
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namespace boost {
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template<class T, std::size_t N>
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class array {
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public:
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T elems[N]; // fixed-size array of elements of type T
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public:
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// type definitions
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typedef T value_type;
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typedef T* iterator;
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typedef const T* const_iterator;
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typedef T& reference;
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typedef const T& const_reference;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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// iterator support
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iterator begin() { return elems; }
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const_iterator begin() const { return elems; }
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const_iterator cbegin() const { return elems; }
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iterator end() { return elems+N; }
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const_iterator end() const { return elems+N; }
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const_iterator cend() const { return elems+N; }
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// reverse iterator support
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#if !defined(BOOST_MSVC_STD_ITERATOR) && !defined(BOOST_NO_STD_ITERATOR_TRAITS)
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typedef std::reverse_iterator<iterator> reverse_iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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#elif defined(_RWSTD_NO_CLASS_PARTIAL_SPEC)
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typedef std::reverse_iterator<iterator, std::random_access_iterator_tag,
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value_type, reference, iterator, difference_type> reverse_iterator;
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typedef std::reverse_iterator<const_iterator, std::random_access_iterator_tag,
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value_type, const_reference, const_iterator, difference_type> const_reverse_iterator;
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#else
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// workaround for broken reverse_iterator implementations
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typedef std::reverse_iterator<iterator,T> reverse_iterator;
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typedef std::reverse_iterator<const_iterator,T> const_reverse_iterator;
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#endif
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reverse_iterator rbegin() { return reverse_iterator(end()); }
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const_reverse_iterator rbegin() const {
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return const_reverse_iterator(end());
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}
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const_reverse_iterator crbegin() const {
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return const_reverse_iterator(end());
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}
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reverse_iterator rend() { return reverse_iterator(begin()); }
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const_reverse_iterator rend() const {
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return const_reverse_iterator(begin());
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}
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const_reverse_iterator crend() const {
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return const_reverse_iterator(begin());
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}
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// operator[]
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reference operator[](size_type i)
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{
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return BOOST_ASSERT_MSG( i < N, "out of range" ), elems[i];
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}
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/*BOOST_CONSTEXPR*/ const_reference operator[](size_type i) const
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{
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return BOOST_ASSERT_MSG( i < N, "out of range" ), elems[i];
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}
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// at() with range check
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reference at(size_type i) { return rangecheck(i), elems[i]; }
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/*BOOST_CONSTEXPR*/ const_reference at(size_type i) const { return rangecheck(i), elems[i]; }
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// front() and back()
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reference front()
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{
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return elems[0];
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}
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BOOST_CONSTEXPR const_reference front() const
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{
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return elems[0];
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}
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reference back()
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{
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return elems[N-1];
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}
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BOOST_CONSTEXPR const_reference back() const
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{
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return elems[N-1];
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}
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// size is constant
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static BOOST_CONSTEXPR size_type size() { return N; }
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static BOOST_CONSTEXPR bool empty() { return false; }
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static BOOST_CONSTEXPR size_type max_size() { return N; }
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enum { static_size = N };
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// swap (note: linear complexity)
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void swap (array<T,N>& y) {
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for (size_type i = 0; i < N; ++i)
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boost::swap(elems[i],y.elems[i]);
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}
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// direct access to data (read-only)
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const T* data() const { return elems; }
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T* data() { return elems; }
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// use array as C array (direct read/write access to data)
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T* c_array() { return elems; }
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// assignment with type conversion
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template <typename T2>
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array<T,N>& operator= (const array<T2,N>& rhs) {
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std::copy(rhs.begin(),rhs.end(), begin());
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return *this;
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}
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// assign one value to all elements
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void assign (const T& value) { fill ( value ); } // A synonym for fill
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void fill (const T& value)
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{
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std::fill_n(begin(),size(),value);
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}
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// check range (may be private because it is static)
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static BOOST_CONSTEXPR bool rangecheck (size_type i) {
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return i > size() ? boost::throw_exception(std::out_of_range ("array<>: index out of range")), true : true;
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}
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};
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template< class T >
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class array< T, 0 > {
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public:
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// type definitions
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typedef T value_type;
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typedef T* iterator;
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typedef const T* const_iterator;
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typedef T& reference;
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typedef const T& const_reference;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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// iterator support
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iterator begin() { return iterator( reinterpret_cast< T * >( this ) ); }
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const_iterator begin() const { return const_iterator( reinterpret_cast< const T * >( this ) ); }
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const_iterator cbegin() const { return const_iterator( reinterpret_cast< const T * >( this ) ); }
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iterator end() { return begin(); }
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const_iterator end() const { return begin(); }
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const_iterator cend() const { return cbegin(); }
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// reverse iterator support
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#if !defined(BOOST_MSVC_STD_ITERATOR) && !defined(BOOST_NO_STD_ITERATOR_TRAITS)
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typedef std::reverse_iterator<iterator> reverse_iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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#elif defined(_RWSTD_NO_CLASS_PARTIAL_SPEC)
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typedef std::reverse_iterator<iterator, std::random_access_iterator_tag,
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value_type, reference, iterator, difference_type> reverse_iterator;
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typedef std::reverse_iterator<const_iterator, std::random_access_iterator_tag,
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value_type, const_reference, const_iterator, difference_type> const_reverse_iterator;
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#else
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// workaround for broken reverse_iterator implementations
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typedef std::reverse_iterator<iterator,T> reverse_iterator;
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typedef std::reverse_iterator<const_iterator,T> const_reverse_iterator;
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#endif
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reverse_iterator rbegin() { return reverse_iterator(end()); }
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const_reverse_iterator rbegin() const {
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return const_reverse_iterator(end());
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}
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const_reverse_iterator crbegin() const {
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return const_reverse_iterator(end());
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}
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reverse_iterator rend() { return reverse_iterator(begin()); }
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const_reverse_iterator rend() const {
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return const_reverse_iterator(begin());
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}
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const_reverse_iterator crend() const {
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return const_reverse_iterator(begin());
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}
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// operator[]
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reference operator[](size_type /*i*/)
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{
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return failed_rangecheck();
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}
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/*BOOST_CONSTEXPR*/ const_reference operator[](size_type /*i*/) const
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{
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return failed_rangecheck();
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}
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// at() with range check
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reference at(size_type /*i*/) { return failed_rangecheck(); }
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/*BOOST_CONSTEXPR*/ const_reference at(size_type /*i*/) const { return failed_rangecheck(); }
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// front() and back()
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reference front()
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{
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return failed_rangecheck();
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}
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BOOST_CONSTEXPR const_reference front() const
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{
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return failed_rangecheck();
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}
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reference back()
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{
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return failed_rangecheck();
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}
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BOOST_CONSTEXPR const_reference back() const
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{
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return failed_rangecheck();
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}
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// size is constant
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static BOOST_CONSTEXPR size_type size() { return 0; }
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static BOOST_CONSTEXPR bool empty() { return true; }
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static BOOST_CONSTEXPR size_type max_size() { return 0; }
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enum { static_size = 0 };
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void swap (array<T,0>& /*y*/) {
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}
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// direct access to data (read-only)
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const T* data() const { return 0; }
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T* data() { return 0; }
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// use array as C array (direct read/write access to data)
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T* c_array() { return 0; }
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// assignment with type conversion
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template <typename T2>
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array<T,0>& operator= (const array<T2,0>& ) {
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return *this;
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}
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// assign one value to all elements
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void assign (const T& value) { fill ( value ); }
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void fill (const T& ) {}
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// check range (may be private because it is static)
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static reference failed_rangecheck () {
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std::out_of_range e("attempt to access element of an empty array");
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boost::throw_exception(e);
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#if defined(BOOST_NO_EXCEPTIONS) || (!defined(BOOST_MSVC) && !defined(__PATHSCALE__))
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//
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// We need to return something here to keep
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// some compilers happy: however we will never
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// actually get here....
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//
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static T placeholder;
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return placeholder;
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#endif
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}
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};
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// comparisons
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template<class T, std::size_t N>
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bool operator== (const array<T,N>& x, const array<T,N>& y) {
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return std::equal(x.begin(), x.end(), y.begin());
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}
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template<class T, std::size_t N>
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bool operator< (const array<T,N>& x, const array<T,N>& y) {
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return std::lexicographical_compare(x.begin(),x.end(),y.begin(),y.end());
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}
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template<class T, std::size_t N>
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bool operator!= (const array<T,N>& x, const array<T,N>& y) {
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return !(x==y);
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}
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template<class T, std::size_t N>
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bool operator> (const array<T,N>& x, const array<T,N>& y) {
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return y<x;
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}
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template<class T, std::size_t N>
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bool operator<= (const array<T,N>& x, const array<T,N>& y) {
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return !(y<x);
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}
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template<class T, std::size_t N>
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bool operator>= (const array<T,N>& x, const array<T,N>& y) {
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return !(x<y);
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}
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// global swap()
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template<class T, std::size_t N>
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inline void swap (array<T,N>& x, array<T,N>& y) {
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x.swap(y);
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}
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#if defined(__SUNPRO_CC)
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// Trac ticket #4757; the Sun Solaris compiler can't handle
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// syntax like 'T(&get_c_array(boost::array<T,N>& arg))[N]'
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//
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// We can't just use this for all compilers, because the
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// borland compilers can't handle this form.
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namespace detail {
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template <typename T, std::size_t N> struct c_array
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{
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typedef T type[N];
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};
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}
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// Specific for boost::array: simply returns its elems data member.
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template <typename T, std::size_t N>
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typename detail::c_array<T,N>::type& get_c_array(boost::array<T,N>& arg)
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{
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return arg.elems;
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}
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// Specific for boost::array: simply returns its elems data member.
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template <typename T, std::size_t N>
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typename detail::c_array<T,N>::type const& get_c_array(const boost::array<T,N>& arg)
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{
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return arg.elems;
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}
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#else
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// Specific for boost::array: simply returns its elems data member.
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template <typename T, std::size_t N>
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T(&get_c_array(boost::array<T,N>& arg))[N]
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{
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return arg.elems;
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}
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// Const version.
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template <typename T, std::size_t N>
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const T(&get_c_array(const boost::array<T,N>& arg))[N]
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{
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return arg.elems;
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}
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#endif
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#if 0
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// Overload for std::array, assuming that std::array will have
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// explicit conversion functions as discussed at the WG21 meeting
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// in Summit, March 2009.
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template <typename T, std::size_t N>
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T(&get_c_array(std::array<T,N>& arg))[N]
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{
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return static_cast<T(&)[N]>(arg);
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}
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// Const version.
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template <typename T, std::size_t N>
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const T(&get_c_array(const std::array<T,N>& arg))[N]
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{
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return static_cast<T(&)[N]>(arg);
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}
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#endif
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template <class It> std::size_t hash_range(It, It);
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template<class T, std::size_t N>
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std::size_t hash_value(const array<T,N>& arr)
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{
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return boost::hash_range(arr.begin(), arr.end());
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}
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template <size_t Idx, typename T, size_t N>
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T &get(boost::array<T,N> &arr) BOOST_NOEXCEPT {
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BOOST_STATIC_ASSERT_MSG ( Idx < N, "boost::get<>(boost::array &) index out of range" );
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return arr[Idx];
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}
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template <size_t Idx, typename T, size_t N>
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const T &get(const boost::array<T,N> &arr) BOOST_NOEXCEPT {
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BOOST_STATIC_ASSERT_MSG ( Idx < N, "boost::get<>(const boost::array &) index out of range" );
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return arr[Idx];
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}
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} /* namespace boost */
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#ifndef BOOST_NO_CXX11_HDR_ARRAY
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// If we don't have std::array, I'm assuming that we don't have std::get
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namespace std {
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template <size_t Idx, typename T, size_t N>
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T &get(boost::array<T,N> &arr) BOOST_NOEXCEPT {
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BOOST_STATIC_ASSERT_MSG ( Idx < N, "std::get<>(boost::array &) index out of range" );
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return arr[Idx];
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}
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template <size_t Idx, typename T, size_t N>
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const T &get(const boost::array<T,N> &arr) BOOST_NOEXCEPT {
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BOOST_STATIC_ASSERT_MSG ( Idx < N, "std::get<>(const boost::array &) index out of range" );
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return arr[Idx];
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}
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}
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#endif
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#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
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# pragma warning(pop)
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#endif
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#endif /*BOOST_ARRAY_HPP*/
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