73c1fce21c
allows allocations and deallocations to be optimized out. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@210211 91177308-0d34-0410-b5e6-96231b3b80d8
315 lines
11 KiB
C++
315 lines
11 KiB
C++
// -*- C++ -*-
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//===-------------------------- dynarray ----------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_DYNARRAY
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#define _LIBCPP_DYNARRAY
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#include <__config>
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#if _LIBCPP_STD_VER > 11
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/*
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dynarray synopsis
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namespace std { namespace experimental {
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template< typename T >
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class dynarray
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{
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// types:
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typedef T value_type;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef implementation-defined iterator;
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typedef implementation-defined const_iterator;
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typedef reverse_iterator<iterator> reverse_iterator;
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typedef reverse_iterator<const_iterator> const_reverse_iterator;
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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public:
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// construct/copy/destroy:
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explicit dynarray(size_type c);
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template <typename Alloc>
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dynarray(size_type c, const Alloc& alloc);
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dynarray(size_type c, const T& v);
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template <typename Alloc>
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dynarray(size_type c, const T& v, const Alloc& alloc);
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dynarray(const dynarray& d);
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template <typename Alloc>
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dynarray(const dynarray& d, const Alloc& alloc);
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dynarray(initializer_list<T>);
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template <typename Alloc>
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dynarray(initializer_list<T>, const Alloc& alloc);
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dynarray& operator=(const dynarray&) = delete;
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~dynarray();
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// iterators:
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iterator begin() noexcept;
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const_iterator begin() const noexcept;
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const_iterator cbegin() const noexcept;
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iterator end() noexcept;
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const_iterator end() const noexcept;
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const_iterator cend() const noexcept;
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reverse_iterator rbegin() noexcept;
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const_reverse_iterator rbegin() const noexcept;
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const_reverse_iterator crbegin() const noexcept;
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reverse_iterator rend() noexcept;
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const_reverse_iterator rend() const noexcept;
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const_reverse_iterator crend() const noexcept;
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// capacity:
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size_type size() const noexcept;
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size_type max_size() const noexcept;
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bool empty() const noexcept;
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// element access:
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reference operator[](size_type n);
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const_reference operator[](size_type n) const;
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reference front();
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const_reference front() const;
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reference back();
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const_reference back() const;
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const_reference at(size_type n) const;
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reference at(size_type n);
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// data access:
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T* data() noexcept;
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const T* data() const noexcept;
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// mutating member functions:
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void fill(const T& v);
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};
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}} // std::experimental
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*/
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#include <__functional_base>
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#include <iterator>
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#include <stdexcept>
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#include <initializer_list>
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#include <new>
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#include <algorithm>
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#if defined(_LIBCPP_NO_EXCEPTIONS)
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#include <cassert>
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#endif
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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namespace std { namespace experimental { inline namespace __array_extensions_v1 {
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template <class _Tp>
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struct _LIBCPP_TYPE_VIS_ONLY dynarray
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{
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public:
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// types:
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typedef dynarray __self;
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typedef _Tp value_type;
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typedef value_type& reference;
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typedef const value_type& const_reference;
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typedef value_type* iterator;
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typedef const value_type* const_iterator;
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typedef value_type* pointer;
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typedef const value_type* const_pointer;
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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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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private:
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size_t __size_;
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value_type * __base_;
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_LIBCPP_ALWAYS_INLINE dynarray () noexcept : __base_(nullptr), __size_(0) {}
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static inline _LIBCPP_INLINE_VISIBILITY value_type* __allocate ( size_t count )
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{
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if ( numeric_limits<size_t>::max() / sizeof (value_type) <= count )
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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throw bad_array_length();
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#else
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assert(!"dynarray::allocation");
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#endif
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}
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return static_cast<value_type *> (_VSTD::__allocate (sizeof(value_type) * count));
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}
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static inline _LIBCPP_INLINE_VISIBILITY void __deallocate ( value_type* __ptr ) noexcept
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{
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_VSTD::__deallocate (static_cast<void *> (__ptr));
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}
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public:
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explicit dynarray(size_type __c);
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dynarray(size_type __c, const value_type& __v);
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dynarray(const dynarray& __d);
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dynarray(initializer_list<value_type>);
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// We're not implementing these right now.
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// Waiting for the resolution of LWG issue #2235
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// template <typename _Alloc>
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// dynarray(size_type __c, const _Alloc& __alloc);
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// template <typename _Alloc>
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// dynarray(size_type __c, const value_type& __v, const _Alloc& __alloc);
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// template <typename _Alloc>
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// dynarray(const dynarray& __d, const _Alloc& __alloc);
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// template <typename _Alloc>
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// dynarray(initializer_list<value_type>, const _Alloc& __alloc);
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dynarray& operator=(const dynarray&) = delete;
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~dynarray();
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// iterators:
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inline _LIBCPP_INLINE_VISIBILITY iterator begin() noexcept { return iterator(data()); }
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inline _LIBCPP_INLINE_VISIBILITY const_iterator begin() const noexcept { return const_iterator(data()); }
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inline _LIBCPP_INLINE_VISIBILITY const_iterator cbegin() const noexcept { return const_iterator(data()); }
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inline _LIBCPP_INLINE_VISIBILITY iterator end() noexcept { return iterator(data() + __size_); }
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inline _LIBCPP_INLINE_VISIBILITY const_iterator end() const noexcept { return const_iterator(data() + __size_); }
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inline _LIBCPP_INLINE_VISIBILITY const_iterator cend() const noexcept { return const_iterator(data() + __size_); }
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inline _LIBCPP_INLINE_VISIBILITY reverse_iterator rbegin() noexcept { return reverse_iterator(end()); }
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inline _LIBCPP_INLINE_VISIBILITY const_reverse_iterator rbegin() const noexcept { return const_reverse_iterator(end()); }
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inline _LIBCPP_INLINE_VISIBILITY const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(end()); }
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inline _LIBCPP_INLINE_VISIBILITY reverse_iterator rend() noexcept { return reverse_iterator(begin()); }
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inline _LIBCPP_INLINE_VISIBILITY const_reverse_iterator rend() const noexcept { return const_reverse_iterator(begin()); }
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inline _LIBCPP_INLINE_VISIBILITY const_reverse_iterator crend() const noexcept { return const_reverse_iterator(begin()); }
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// capacity:
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inline _LIBCPP_INLINE_VISIBILITY size_type size() const noexcept { return __size_; }
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inline _LIBCPP_INLINE_VISIBILITY size_type max_size() const noexcept { return __size_; }
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inline _LIBCPP_INLINE_VISIBILITY bool empty() const noexcept { return __size_ == 0; }
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// element access:
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inline _LIBCPP_INLINE_VISIBILITY reference operator[](size_type __n) { return data()[__n]; }
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inline _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __n) const { return data()[__n]; }
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inline _LIBCPP_INLINE_VISIBILITY reference front() { return data()[0]; }
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inline _LIBCPP_INLINE_VISIBILITY const_reference front() const { return data()[0]; }
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inline _LIBCPP_INLINE_VISIBILITY reference back() { return data()[__size_-1]; }
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inline _LIBCPP_INLINE_VISIBILITY const_reference back() const { return data()[__size_-1]; }
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inline _LIBCPP_INLINE_VISIBILITY const_reference at(size_type __n) const;
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inline _LIBCPP_INLINE_VISIBILITY reference at(size_type __n);
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// data access:
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inline _LIBCPP_INLINE_VISIBILITY _Tp* data() noexcept { return __base_; }
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inline _LIBCPP_INLINE_VISIBILITY const _Tp* data() const noexcept { return __base_; }
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// mutating member functions:
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inline _LIBCPP_INLINE_VISIBILITY void fill(const value_type& __v) { fill_n(begin(), __size_, __v); }
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};
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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dynarray<_Tp>::dynarray(size_type __c) : dynarray ()
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{
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__base_ = __allocate (__c);
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value_type *__data = data ();
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for ( __size_ = 0; __size_ < __c; ++__size_, ++__data )
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::new (__data) value_type;
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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dynarray<_Tp>::dynarray(size_type __c, const value_type& __v) : dynarray ()
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{
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__base_ = __allocate (__c);
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value_type *__data = data ();
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for ( __size_ = 0; __size_ < __c; ++__size_, ++__data )
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::new (__data) value_type (__v);
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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dynarray<_Tp>::dynarray(initializer_list<value_type> __il) : dynarray ()
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{
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size_t sz = __il.size();
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__base_ = __allocate (sz);
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value_type *__data = data ();
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auto src = __il.begin();
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for ( __size_ = 0; __size_ < sz; ++__size_, ++__data, ++src )
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::new (__data) value_type (*src);
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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dynarray<_Tp>::dynarray(const dynarray& __d) : dynarray ()
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{
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size_t sz = __d.size();
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__base_ = __allocate (sz);
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value_type *__data = data ();
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auto src = __d.begin();
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for ( __size_ = 0; __size_ < sz; ++__size_, ++__data, ++src )
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::new (__data) value_type (*src);
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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dynarray<_Tp>::~dynarray()
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{
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value_type *__data = data () + __size_;
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for ( size_t i = 0; i < __size_; ++i )
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(--__data)->value_type::~value_type();
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__deallocate ( __base_ );
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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typename dynarray<_Tp>::reference
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dynarray<_Tp>::at(size_type __n)
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{
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if (__n >= __size_)
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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throw out_of_range("dynarray::at");
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#else
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assert(!"dynarray::at out_of_range");
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#endif
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}
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return data()[__n];
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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typename dynarray<_Tp>::const_reference
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dynarray<_Tp>::at(size_type __n) const
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{
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if (__n >= __size_)
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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throw out_of_range("dynarray::at");
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#else
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assert(!"dynarray::at out_of_range");
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#endif
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}
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return data()[__n];
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}
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}}}
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Tp, class _Alloc>
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struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<std::experimental::dynarray<_Tp>, _Alloc> : true_type {};
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_LIBCPP_END_NAMESPACE_STD
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#endif // if _LIBCPP_STD_VER > 11
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#endif // _LIBCPP_DYNARRAY
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