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gmx::ArrayRef< T > Class Template Reference

#include <gromacs/utility/arrayref.h>

Description

template<typename T>
class gmx::ArrayRef< T >

STL-like container for an interface to a C array of T (or part of a std::vector<T, A> or std::array<T>).

Template Parameters
TValue type of elements.

This class provides an interface similar to std::vector<T, A>, with the following main differences:

This class is useful for writing wrappers that expose a view of the internal data stored as a single vector/array, which can be a whole or part of the underlying storage.

Methods in this class do not throw, except where indicated.

Note that due to a Doxygen limitation, the constructor that takes a C array whose size is known at compile time does not appear in the documentation.

To refer to const data of type T, ArrayRef<const T> is used. For both const and non-const std::vector and std::array an ArrayRef view can be created. Attempting to create a non-const ArrayRef of a const vector/array will result in a compiler error in the respective constructor.

For SIMD types there is template specialization available (e.g. ArrayRef<SimdReal>) in gromacs/simd/simd_memory.h which should have the same functionality as much as possible.

Todo:
This class is not complete. There are likely also methods missing (not required for current usage).

Public Types

typedef T value_type
 Type of values stored in the container.
 
typedef size_t size_type
 Type for representing size of the container.
 
typedef ptrdiff_t difference_type
 Type for representing difference between two container indices.
 
typedef const T & const_reference
 Const reference to a container element.
 
typedef const T * const_pointer
 Const pointer to a container element.
 
typedef const T * const_iterator
 Const iterator type for the container.
 
typedef T & reference
 Reference to a container element.
 
typedef T * pointer
 Pointer to a container element.
 
typedef T * iterator
 Iterator type for the container.
 
typedef std::reverse_iterator
< iterator
reverse_iterator
 Standard reverse iterator.
 
typedef std::reverse_iterator
< const_iterator
const_reverse_iterator
 Standard reverse iterator.
 

Public Member Functions

 ArrayRef ()
 Constructs an empty reference.
 
 ArrayRef (const EmptyArrayRef &)
 Constructs an empty reference. More...
 
template<typename U , typename = typename std::enable_if< std::is_convertible<typename std::remove_reference<U>::type::pointer, pointer>::value>::type>
 ArrayRef (U &&o)
 Constructs a reference to a container or reference. More...
 
 ArrayRef (pointer begin, pointer end)
 Constructs a reference to a particular range. More...
 
ArrayRef subArray (size_type start, size_type count) const
 Returns a reference to part of the container.
 
iterator begin () const
 Returns an iterator to the beginning of the container.
 
iterator end () const
 Returns an iterator to the end of the container.
 
reverse_iterator rbegin () const
 Returns an iterator to the reverse beginning of the container.
 
reverse_iterator rend () const
 Returns an iterator to the reverse end of the container.
 
size_type size () const
 Returns the size of the container.
 
size_type capacity () const
 Identical to size().
 
bool empty () const
 Whether the container is empty.
 
reference operator[] (size_type n) const
 Access container element.
 
reference at (size_type n) const
 Access container element (throws on out-of-range error).
 
reference front () const
 Returns the first element in the container.
 
reference back () const
 Returns the first element in the container.
 
pointer data () const
 Returns a raw pointer to the contents of the array.
 
void swap (ArrayRef< T > &other)
 Swaps referenced memory with the other object. More...
 

Related Functions

(Note that these are not member functions.)

template<typename T >
ArrayRef< T > arrayRefFromArray (T *begin, size_t size)
 
template<typename T >
ArrayRef< const T > constArrayRefFromArray (const T *begin, size_t size)
 

Constructor & Destructor Documentation

template<typename T>
gmx::ArrayRef< T >::ArrayRef ( const EmptyArrayRef< T > &  )
inline

Constructs an empty reference.

This is provided for convenience, such that EmptyArrayRef can be used to initialize any ArrayRef, without specifying the template type. It is not explicit to enable that usage.

template<typename T>
template<typename U , typename = typename std::enable_if< std::is_convertible<typename std::remove_reference<U>::type::pointer, pointer>::value>::type>
gmx::ArrayRef< T >::ArrayRef ( U &&  o)
inline

Constructs a reference to a container or reference.

Parameters
[in]ocontainer to reference.

Can be used to create a reference to a whole vector, std::array or an ArrayRef. The destination has to have a convertible pointer type (identical besides const or base class).

Passed container must remain valid and not be reallocated for the lifetime of this object.

This constructor is not explicit to allow directly passing a container to a method that takes ArrayRef.

template<typename T>
gmx::ArrayRef< T >::ArrayRef ( pointer  begin,
pointer  end 
)
inline

Constructs a reference to a particular range.

Parameters
[in]beginPointer to the beginning of a range.
[in]endPointer to the end of a range.

Passed pointers must remain valid for the lifetime of this object.

Member Function Documentation

template<typename T>
void gmx::ArrayRef< T >::swap ( ArrayRef< T > &  other)
inline

Swaps referenced memory with the other object.

The actual memory areas are not modified, only the references are swapped.

Friends And Related Function Documentation

template<typename T >
ArrayRef< T > arrayRefFromArray ( T *  begin,
size_t  size 
)
related

template<typename T >
ArrayRef< const T > constArrayRefFromArray ( const T *  begin,
size_t  size 
)
related


The documentation for this class was generated from the following files: