Block< T, STRIDED, MOVE > Class Template Reference

#include <block.h>

Detailed Description

template<typename T, Bool STRIDED, Bool MOVE>
class maxon::Block< T, STRIDED, MOVE >

A Block stands for a number of elements with a regular memory layout. It consists of a pointer for the first element, the element count and optionally a stride. All elements are placed consecutively in memory, but with a possible padding inbetween: The stride is the pointer difference between consecutive elements in bytes. By default, the stride is just SIZEOF(T).

You can use an alternative stride length to access only specific elements of your array. For example if you have an array with XYZ vectors and want to access only the X-values as a block, you could use the pointer to the first X-value and a stride length of SIZEOF(Vector). Or for a Block whose elements are all the same, you can use a stride of 0 and a pointer to a single value.

There is an important difference between a Block and arrays such as BaseArray with respect to the meaning of a const Block: A const block can't be modified itself, so its pointer and length cannot be changed, but the memory to which the block points is still non-const (if #T is a non-const type). So you can modify the memory through a const block. In other words, a[13] = 42; is OK for a const Block<Int> a, but not for a const BaseArray<Int> a. Therefore you have to use Block<const Int> whenever the memory of the block shall be read-only. A typical case is an input parameter to a function such as

static Result<Int32> StringConversion::ToInt32(const Block<const Utf32Char>& str, STRINGCONVERSION flags);

A Block supports the usual array functions which do not modify the length. Also it can be converted to the Array interface. If unsupported functions are invoked then, they will cause a DebugStop and indicate a failure on return.

Template Parameters

T	Type of elements of the block. If the memory must not be modified through this block, use a const type.
STRIDED	True if a stride other than SIZEOF(T) shall be supported.
MOVE	True if the values of this block shall be moved (only useful when used as a parameter type, see MoveBlock).

See also

$ref blocks

Public Types
using	Super = ArrayBase< Block< T, STRIDED, MOVE >, T, BlockBase< T, STRIDED >, DefaultCompare >
using	StrideType = typename std::conditional< GENERIC, Char, T >::type
using	IsBlock = std::true_type
using	Iterator = BaseIterator< Block, STRIDED >
using	ConstIterator = BaseIterator< const Block, STRIDED >

Public Member Functions
	Block ()
	Block (T *ptr, Int size, Int stride=(STRIDED &&GENERIC) ? -1 :SIZEOF(StrideType))
	Block (Iterator start, Int size, Int stride=(STRIDED &&GENERIC) ? -1 :SIZEOF(StrideType))
	Block (ConstIterator start, Int size, Int stride=(STRIDED &&GENERIC) ? -1 :SIZEOF(StrideType))
template<Int N>
MAXON_IMPLICIT	Block (T(&array)[N])
MAXON_IMPLICIT	Block (const std::initializer_list< typename std::remove_const< T >::type > &list)
	Block (const Block &src)=default
Block &	operator= (const Block &src)=default
Result< void >	CopyFrom (const Block &src)=delete
	operator ArrayImpl< Block & > ()=delete
	operator ArrayImpl< const Block & > () const =delete
Int	GetStride () const
Bool	IsStrided () const
void	Set (T *ptr, Int size, Int stride=(STRIDED &&GENERIC) ? -1 :SIZEOF(StrideType))
void	Reset ()
	operator typename std::conditional< STRIDED, DummyReturnType, Block< T, true, MOVE >>::type () const
	operator typename std::conditional< STRIDED||STD_IS_REPLACEMENT (const, T)
const Block< const T, true, MOVE >	type () const
	operator typename std::conditional< STD_IS_REPLACEMENT (const, T)
volatile const Block< const T, STRIDED, MOVE > &	type () const
	operator typename std::conditional< STRIDED||!MOVE, DummyReturnType &, Block< T, true, false >>::type () const
	operator typename std::conditional< STRIDED||!MOVE||STD_IS_REPLACEMENT (const, T)
const DummyReturnType Block< const T, true, false >	type () const
	operator typename std::conditional<!MOVE||STD_IS_REPLACEMENT (const, T)
volatile DummyReturnType const Block< const T, STRIDED, false > &	type () const
	operator typename std::conditional<!MOVE, const volatile DummyReturnType &, const Block< T, STRIDED, false > & >::type () const
	operator typename std::conditional< GENERIC, const volatile DummyReturnType, const Block< typename InheritConst< Generic, T >::type, STRIDED > & >::type () const
T *	GetFirst () const
void	SetFirst (T *value)
T *	GetLast () const
T &	operator[] (Int index) const
Block	Slice (Int start) const
Block	Slice (Int start, Int end) const
Bool	StartsWith (const Block &prefix) const
Iterator	Begin () const
Iterator	End () const
Int	GetCapacityCount () const
template<typename T2 , Bool S2>
Result< void >	CopyValuesFrom (const Block< T2, S2 > &other)
template<typename COLLECTION >
Result< void >	CopyValuesFrom (const COLLECTION &other)
Int	GetMemorySize () const
Int	GetBlock (Int index, Block< const T, false > &block) const
Int	GetBlock (Int index, Block< T, false > &block)
Int	GetBlock (Int index, StridedBlock< T > &block)
Int	GetBlock (Int index, StridedBlock< const T > &block) const

Static Public Member Functions
static const Block &	NullValueRef ()

Public Attributes
const	DummyReturnType
volatile	DummyReturnType

Static Public Attributes
static const Bool	GENERIC

Private Member Functions
T *	GetPtr (Int index) const
ResultRef< T >	Insert (Int index)
ResultMem	Insert (Int index, const Block< const T > &values)
ResultRef< T >	Append ()
ResultMem	Erase (Int index, Int count)
ResultMem	SwapErase (Int index, Int count)
ResultMem	SetCapacityHint (Int requestedCapacity, COLLECTION_RESIZE_FLAGS resizeFlags=COLLECTION_RESIZE_FLAGS::ON_GROW_RESERVE_CAPACITY)
ResultMem	Resize (Int count, COLLECTION_RESIZE_FLAGS resizeFlags=COLLECTION_RESIZE_FLAGS::DEFAULT)
void	Flush ()

Friends
template<typename ARRAY >
class	ArrayImpl

Member Typedef Documentation

Super

using Super = ArrayBase<Block<T, STRIDED, MOVE>, T, BlockBase<T, STRIDED>, DefaultCompare>

StrideType

using StrideType = typename std::conditional<GENERIC, Char, T>::type

IsBlock

using IsBlock = std::true_type

Iterator

using Iterator = BaseIterator<Block, STRIDED>

ConstIterator

using ConstIterator = BaseIterator<const Block, STRIDED>

Constructor & Destructor Documentation

Block() [1/7]

Block

(

)

Constructs an empty block with a nullptr pointer and zero count.

Block() [2/7]

Block	(	T *	ptr,
		Int	size,
		Int	stride = (STRIDED && GENERIC) ? -1 : SIZEOF(StrideType)
	)

Constructs a block using the given values.

Parameters

[in]	ptr	Pointer to the first element.
[in]	size	Number of elements.
[in]	stride	Element stride. If the STRIDED parameter of the Block class is false, this has to be SIZEOF(T).

Block() [3/7]

Block	(	Iterator	start,
		Int	size,
		Int	stride = (STRIDED && GENERIC) ? -1 : SIZEOF(StrideType)
	)

Constructs a block from iterator and size. Equivalent to Block(static_cast<T*>(&*start), size, stride).

Block() [4/7]

Block	(	ConstIterator	start,
		Int	size,
		Int	stride = (STRIDED && GENERIC) ? -1 : SIZEOF(StrideType)
	)

Constructs a block from const iterator and size. Equivalent to Block(static_cast<T*>(&*start), size, stride).

Block() [5/7]

MAXON_IMPLICIT Block

(

T(&)

array[N]

)

Constructs a block for a C++ fixed-size array. The length is automatically set to the full length of the array.

Block() [6/7]

MAXON_IMPLICIT Block

(

const std::initializer_list< typename std::remove_const< T >::type > &

list

)

Block() [7/7]

Block ( const Block< T, STRIDED, MOVE > &  src )

default

Member Function Documentation

operator=()

Block& operator= ( const Block< T, STRIDED, MOVE > &  src )

default

CopyFrom()

Result<void> CopyFrom ( const Block< T, STRIDED, MOVE > &  src )

delete

operator ArrayImpl< Block & >()

operator ArrayImpl< Block & > ( )

delete

operator ArrayImpl< const Block & >()

operator ArrayImpl< const Block & > ( ) const

delete

GetStride()

Int GetStride

(

)

const

Returns the stride of this block. If the STRIDED parameter of the Block class is false, this will always be SIZEOF(T).

Returns

Element stride of this block, i.e., the difference in bytes between two consecutive elements.

IsStrided()

Bool IsStrided

(

)

const

Returns true if this block uses a stride other than SIZEOF(T).

Returns

True if the stride differs from the element size.

Set()

void Set	(	T *	ptr,
		Int	size,
		Int	stride = (STRIDED && GENERIC) ? -1 : SIZEOF(StrideType)
	)

Sets this block to new values.

Parameters

[in]	ptr	Pointer to the first element.
[in]	size	Number of elements.
[in]	stride	Element stride. If the STRIDED parameter of the Block class is false, this has to be SIZEOF(T).

Reset()

void Reset

(

)

Resets this block so that is points to nullptr and has zero length.

operator typename std::conditional< STRIDED, DummyReturnType, Block< T, true, MOVE >>::type()

operator typename std::conditional< STRIDED, DummyReturnType, Block< T, true, MOVE >>::type

(

)

const

Converts this block to a strided block.

operator typename std::conditional< STRIDED||STD_IS_REPLACEMENT()

operator typename std::conditional< STRIDED||STD_IS_REPLACEMENT	(	const	,
		T
	)

Converts this block to a strided block with constant elements.

type() [1/4]

const Block<const T, true, MOVE> type

(

)

const

operator typename std::conditional< STD_IS_REPLACEMENT()

operator typename std::conditional< STD_IS_REPLACEMENT	(	const	,
		T
	)

Converts this block to a block with constant elements.

type() [2/4]

volatile const Block<const T, STRIDED, MOVE>& type

(

)

const

operator typename std::conditional< STRIDED||!MOVE, DummyReturnType &, Block< T, true, false >>::type()

operator typename std::conditional< STRIDED||!MOVE, DummyReturnType &, Block< T, true, false >>::type

(

)

const

Converts this block to a strided non-movable block.

operator typename std::conditional< STRIDED||!MOVE||STD_IS_REPLACEMENT()

operator typename std::conditional< STRIDED||!MOVE||STD_IS_REPLACEMENT	(	const	,
		T
	)

Converts this block to a strided non-movable block with constant elements.

type() [3/4]

const DummyReturnType Block<const T, true, false> type

(

)

const

operator typename std::conditional<!MOVE||STD_IS_REPLACEMENT()

operator typename std::conditional<!MOVE||STD_IS_REPLACEMENT	(	const	,
		T
	)

Converts this block to a non-movable block with constant elements.

type() [4/4]

volatile DummyReturnType const Block<const T, STRIDED, false>& type

(

)

const

operator typename std::conditional<!MOVE, const volatile DummyReturnType &, const Block< T, STRIDED, false > & >::type()

operator typename std::conditional<!MOVE, const volatile DummyReturnType &, const Block< T, STRIDED, false > & >::type

(

)

const

Converts this block to a non-movable block.

operator typename std::conditional< GENERIC, const volatile DummyReturnType, const Block< typename InheritConst< Generic, T >::type, STRIDED > & >::type()

operator typename std::conditional< GENERIC, const volatile DummyReturnType, const Block< typename InheritConst< Generic, T >::type, STRIDED > & >::type

(

)

const

Converts this block to a generic block.

GetFirst()

T* GetFirst

(

)

const

Returns the first element of this block. For an empty block, this is undefined and might be nullptr or any other value.

Returns

Pointer to the first element of this block (undefined if the block is empty).

SetFirst()

void SetFirst

(

T *

value

)

Sets the first element of this block, may be nullptr.

Parameters

[in]

value

Pointer to first element of this block.

GetLast()

T* GetLast

(

)

const

Returns the last element of this block. For an empty block, this is undefined and might be nullptr or any other value.

Returns

Pointer to the last element of this block (undefined if the block is empty).

operator[]()

T& operator[]

(

Int

index

)

const

Returns the element at the given index of this block.

Parameters

[in]

index

Index into the block.

Returns

Reference to the value at index.

Slice() [1/2]

Block Slice

(

Int

start

)

const

Returns a sub block of this block with contains the elements from the given start index up to the end of the block.

Parameters

[in]

start

Start index of the sub block.

Returns

Sub block starting at start.

Slice() [2/2]

Block Slice	(	Int	start,
		Int	end
	)		const

Returns a sub block of this block with contains the elements from the given start index up to but not including the given end index.

Parameters

[in]	start	Start index of the sub block.
[in]	end	End index of the sub block. The end index is exclusive.

Returns

Sub block with elements from start up to end.

StartsWith()

Bool StartsWith

(

const Block< T, STRIDED, MOVE > &

prefix

)

const

Begin()

Iterator Begin

(

)

const

Gets an iterator for the first element.

Returns

Iterator for the first element (equal to End() if the array is empty).

End()

Iterator End

(

)

const

Gets an iterator for the end (End() - 1 is the last element if the array is not empty).

Returns

Iterator for the array end (this is behind the last element).

NullValueRef()

static const Block& NullValueRef ( )

static

GetCapacityCount()

Int GetCapacityCount

(

)

const

CopyValuesFrom() [1/2]

Result<void> CopyValuesFrom

(

const Block< T2, S2 > &

other

)

CopyValuesFrom() [2/2]

Result<void> CopyValuesFrom

(

const COLLECTION &

other

)

GetMemorySize()

Int GetMemorySize

(

)

const

GetBlock() [1/4]

Int GetBlock	(	Int	index,
		Block< const T, false > &	block
	)		const

GetBlock() [2/4]

Int GetBlock	(	Int	index,
		Block< T, false > &	block
	)

GetBlock() [3/4]

Int GetBlock	(	Int	index,
		StridedBlock< T > &	block
	)

GetBlock() [4/4]

Int GetBlock	(	Int	index,
		StridedBlock< const T > &	block
	)		const

GetPtr()

T* GetPtr ( Int  index ) const

private

Insert() [1/2]

ResultRef<T> Insert ( Int  index )

private

Insert() [2/2]

ResultMem Insert ( Int  index, const Block< const T > &  values  )

private

Append()

ResultRef<T> Append ( )

private

Erase()

ResultMem Erase ( Int  index, Int  count  )

private

SwapErase()

ResultMem SwapErase ( Int  index, Int  count  )

private

SetCapacityHint()

ResultMem SetCapacityHint ( Int  requestedCapacity, COLLECTION_RESIZE_FLAGS  resizeFlags = COLLECTION_RESIZE_FLAGS::ON_GROW_RESERVE_CAPACITY  )

private

Resize()

ResultMem Resize ( Int  count, COLLECTION_RESIZE_FLAGS  resizeFlags = COLLECTION_RESIZE_FLAGS::DEFAULT  )

private

Flush()

void Flush ( )

private

Friends And Related Function Documentation

ArrayImpl

friend class ArrayImpl

friend

Member Data Documentation

GENERIC

const Bool GENERIC

static

DummyReturnType [1/2]

const DummyReturnType

DummyReturnType [2/2]

volatile DummyReturnType