casacore
|
#include <IPosition.h>
Public Types | |
typedef ssize_t | value_type |
Define the STL-style iterators. More... | |
typedef ssize_t * | iterator |
typedef const ssize_t * | const_iterator |
typedef value_type * | pointer |
typedef const value_type * | const_pointer |
typedef value_type & | reference |
typedef const value_type & | const_reference |
typedef size_t | size_type |
typedef ptrdiff_t | difference_type |
Public Member Functions | |
IPosition () noexcept | |
A zero-length IPosition. More... | |
IPosition (size_t length) | |
An IPosition of size "length." The values in the object are uninitialized. More... | |
IPosition (std::initializer_list< ssize_t > list) | |
An IPosition initialized from the given list. More... | |
IPosition (size_t length, ssize_t val) | |
An IPosition of size "length." All values in the object are initialized to val. More... | |
template<typename... Vals> | |
IPosition (size_t, ssize_t val1, ssize_t val2, Vals... vals) | |
An IPosition initialized from a variable number of parameters. More... | |
IPosition (const IPosition &source) | |
Makes a copy (copy, NOT reference, semantics) of source. More... | |
IPosition (IPosition &&source) noexcept | |
~IPosition () | |
IPosition & | operator= (const IPosition &source) |
Makes this a copy of other. More... | |
IPosition & | operator= (IPosition &&source) |
IPosition & | operator= (ssize_t value) |
Copy "value" into every position of this IPosition. More... | |
IPosition (const Array< int > &other) | |
Convert an IPosition to and from an Array<int/int64>. More... | |
IPosition (const Array< long long > &other) | |
Vector< int > | asVector () const |
Vector< long long > | asVector64 () const |
IPosition (const std::vector< int > &other) | |
Convert an IPosition to and from an Array<int/int64>. More... | |
IPosition (const std::vector< long long > &other) | |
std::vector< int > | asStdVector () const |
std::vector< long long > | asStdVector64 () const |
template<typename InputIterator > | |
void | fill (size_t size, InputIterator iter) |
Resize and fill this IPosition object. More... | |
template<typename OutputIterator > | |
void | copy (OutputIterator iter) const |
Copy the contents of this IPosition object to the output iterator. More... | |
IPosition | nonDegenerate (size_t startingAxis=0) const |
This member functions return an IPosition which has degenerate (length==1) axes removed and the dimensionality reduced appropriately. More... | |
IPosition | nonDegenerate (const IPosition &ignoreAxes) const |
void | resize (size_t newSize, bool copy=true) |
Old values are copied on resize if copy==true. More... | |
ssize_t & | operator[] (size_t index) |
Index into the IPosition. More... | |
ssize_t | operator[] (size_t index) const |
ssize_t & | operator() (size_t index) |
ssize_t | operator() (size_t index) const |
IPosition | operator() (const IPosition &axes) const |
Make an IPosition by using only the specified elements of the current IPosition. More... | |
ssize_t & | last (size_t index=0) |
Index into the IPosition from the end. More... | |
ssize_t | last (size_t index=0) const |
const ssize_t * | storage () const |
Get the storage. More... | |
void | append (const IPosition &other) |
Append this IPosition with another one (causing a resize). More... | |
void | prepend (const IPosition &other) |
Prepend this IPosition with another one (causing a resize). More... | |
IPosition | concatenate (const IPosition &other) const |
Return an IPosition as the concetanation of this and another IPosition. More... | |
void | setFirst (const IPosition &other) |
Set the first values of this IPosition to another IPosition. More... | |
void | setLast (const IPosition &other) |
Set the last values of this IPosition to another IPosition. More... | |
IPosition | getFirst (size_t n) const |
Construct an IPosition from the first n values of this IPosition. More... | |
IPosition | getLast (size_t n) const |
Construct an IPosition from the last n values of this IPosition. More... | |
IPosition | removeAxes (const IPosition &axes) const |
Return an IPosition where the given axes are reoved. More... | |
IPosition | keepAxes (const IPosition &axes) const |
Return an IPosition containing the given axes only. More... | |
size_t | nelements () const |
The number of elements in this IPosition. More... | |
size_t | size () const |
bool | empty () const |
Is the IPosition empty (i.e. More... | |
bool | conform (const IPosition &other) const |
conform returns true if nelements() == other.nelements(). More... | |
void | operator+= (const IPosition &other) |
Element-by-element arithmetic. More... | |
void | operator-= (const IPosition &other) |
void | operator*= (const IPosition &other) |
void | operator/= (const IPosition &other) |
void | operator+= (ssize_t val) |
void | operator-= (ssize_t val) |
void | operator*= (ssize_t val) |
void | operator/= (ssize_t val) |
long long | product () const |
Returns 0 if nelements() == 0, otherwise it returns the product of its elements. More... | |
bool | allOne () const |
Are all elements equal to 1? Useful to check if a given stride is really a stride. More... | |
bool | isEqual (const IPosition &other) const |
Element-by-element comparison for equality. More... | |
bool | isEqual (const IPosition &other, bool skipDegeneratedAxes) const |
Element-by-element comparison for equality. More... | |
bool | isEqual (const IPosition &other, size_t nrCompare) const |
Element-by-element comparison for (partial) equality. More... | |
bool | isSubSet (const IPosition &other) const |
Is the other IPosition a subset of (or equal to) this IPosition? It is a subset if zero or more axes of this IPosition do not occur or are degenerated in the other and if the remaining axes are in the same order. More... | |
std::string | toString () const |
Write the IPosition into a string. More... | |
bool | ok () const |
Is this IPosition consistent? More... | |
iterator | begin () |
Get the begin and end iterator object for this object. More... | |
const_iterator | begin () const |
iterator | end () |
const_iterator | end () const |
Static Public Member Functions | |
template<typename... Vals> | |
static IPosition | Make (Vals... vals) |
Construct an IPosition that is initialized from a variable number of parameter. More... | |
static IPosition | makeAxisPath (size_t nrdim) |
Construct a default axis path consisting of the values 0. More... | |
static IPosition | makeAxisPath (size_t nrdim, const IPosition &partialPath) |
Construct a full axis path from a (partially) given axis path. More... | |
static IPosition | otherAxes (size_t nrdim, const IPosition &axes) |
Make a list of axes which are the axes not given in axes up to the given dimension. More... | |
Private Types | |
enum | { BufferLength } |
Private Member Functions | |
void | allocateBuffer () |
Allocate a buffer with length size_p. More... | |
void | throwIndexError () const |
Throw an index error exception. More... | |
Private Attributes | |
size_t | size_p |
ssize_t | buffer_p [BufferLength] |
ssize_t * | data_p |
When the iposition is length BufferSize or less data is just buffer_p, avoiding calls to new and delete. More... | |
Friends | |
class | IPositionComparator |
std::ostream & | operator<< (std::ostream &os, const IPosition &ip) |
Write an IPosition to an ostream in a simple text form. More... | |
A Vector of integers, for indexing into Array<T> objects.
Public interface
IPosition is an Index Position in an n-dimensional array.
IPosition is "logically" a Vector<int> constrained so that its origin is zero-based, and in fact that used to be the way it was implemented. It was split out into a separate class to make the inheritance from Arrays simpler (since Arrays use IPositions). The template instantiation mechanism is complicated enough that this simplification was felt to be a good idea.
IPosition objects are normally used to index into, and define the shapes of, multi-dimensional arrays. For example, if you have a 5 dimensional array, you need an IPosition of length 5 to index into the array (or to define its shape, etc.).
Unlike Vectors, IPositions always use copy semantics.
Binary operations must take place either with a conformnat (same size) IPosition or with an integer, which behaves as if it was an IPosition of the same size (i.e., length). All the usual binary arithmetic operations are available, as well as logical operations, which return Booleans. These all operate "element-by-element".
All non-inlined member functions of IPosition check invariants if the preprocessor symbol AIPS_DEBUG is defined. That is, the member functions check that ok() is true (constructors check after construction, other functions on entry to the function). If these tests fail, an AipsError exception is thrown; its message contains the line number and source file of the failure (it is thrown by the lAssert macro defined in aips/Assert.h).
Constructors and functions exist to construct an IPosition directly from a Vector or std::vector object or to convert to it. Furthermore the fill
and copy
can be used to fill from or copy to any STL-type iterator.
Definition at line 118 of file IPosition.h.
typedef const ssize_t* casacore::IPosition::const_iterator |
Definition at line 407 of file IPosition.h.
typedef const value_type* casacore::IPosition::const_pointer |
Definition at line 409 of file IPosition.h.
typedef const value_type& casacore::IPosition::const_reference |
Definition at line 411 of file IPosition.h.
typedef ptrdiff_t casacore::IPosition::difference_type |
Definition at line 413 of file IPosition.h.
typedef ssize_t* casacore::IPosition::iterator |
Definition at line 406 of file IPosition.h.
typedef value_type* casacore::IPosition::pointer |
Definition at line 408 of file IPosition.h.
typedef value_type& casacore::IPosition::reference |
Definition at line 410 of file IPosition.h.
typedef size_t casacore::IPosition::size_type |
Definition at line 412 of file IPosition.h.
typedef ssize_t casacore::IPosition::value_type |
Define the STL-style iterators.
It makes it possible to iterate through all data elements.
Definition at line 405 of file IPosition.h.
|
private |
Enumerator | |
---|---|
BufferLength |
Definition at line 435 of file IPosition.h.
|
inlinenoexcept |
|
explicit |
An IPosition of size "length." The values in the object are uninitialized.
casacore::IPosition::IPosition | ( | std::initializer_list< ssize_t > | list | ) |
An IPosition initialized from the given list.
casacore::IPosition::IPosition | ( | size_t | length, |
ssize_t | val | ||
) |
An IPosition of size "length." All values in the object are initialized to val.
|
inline |
An IPosition initialized from a variable number of parameters.
The first parameter should specify the size, but the actual size of the resulting IPosition is determined from the number of parameters (the first argument is ignored).
This constructor should be disfavoured, because i) of the dummy parameter and ii) because it may narrow the specified parameter without a warning.
Instead, use an initializer list constructor whenever possible. If an IPosition is created inside a macro, an initializer list is not possible. In those cases, use the Make(Vals...) factory method. Both of those methods do not have the above issues. [[ deprecated("Use the initializer list constructor or Make() method") ]]
Definition at line 151 of file IPosition.h.
casacore::IPosition::IPosition | ( | const IPosition & | source | ) |
Makes a copy (copy, NOT reference, semantics) of source.
|
noexcept |
casacore::IPosition::~IPosition | ( | ) |
casacore::IPosition::IPosition | ( | const Array< int > & | other | ) |
casacore::IPosition::IPosition | ( | const Array< long long > & | other | ) |
casacore::IPosition::IPosition | ( | const std::vector< int > & | other | ) |
casacore::IPosition::IPosition | ( | const std::vector< long long > & | other | ) |
|
private |
Allocate a buffer with length size_p.
bool casacore::IPosition::allOne | ( | ) | const |
Are all elements equal to 1? Useful to check if a given stride is really a stride.
void casacore::IPosition::append | ( | const IPosition & | other | ) |
Append this IPosition with another one (causing a resize).
Referenced by casacore::TableExprGroupAggr::getArray(), casacore::TableProxy::record2Array(), and casacore::TableExprNodeSet::toArray().
std::vector<int> casacore::IPosition::asStdVector | ( | ) | const |
std::vector<long long> casacore::IPosition::asStdVector64 | ( | ) | const |
Vector<int> casacore::IPosition::asVector | ( | ) | const |
Vector<long long> casacore::IPosition::asVector64 | ( | ) | const |
|
inline |
Get the begin and end iterator object for this object.
Definition at line 417 of file IPosition.h.
References data_p.
|
inline |
Definition at line 419 of file IPosition.h.
References data_p.
Return an IPosition as the concetanation of this and another IPosition.
Referenced by casacore::ScaledComplexData< VirtualType, StoredType >::storedShape().
|
inline |
conform returns true if nelements() == other.nelements().
Definition at line 636 of file IPosition.h.
References size_p.
Referenced by casacore::TSMShape::conform().
|
inline |
Copy the contents of this IPosition object to the output iterator.
The size of the output must be sufficient.
Definition at line 230 of file IPosition.h.
|
inline |
Is the IPosition empty (i.e.
no elements)?
Definition at line 576 of file IPosition.h.
References size_p.
|
inline |
Definition at line 421 of file IPosition.h.
|
inline |
Definition at line 423 of file IPosition.h.
|
inline |
IPosition casacore::IPosition::getFirst | ( | size_t | n | ) | const |
IPosition casacore::IPosition::getLast | ( | size_t | n | ) | const |
bool casacore::IPosition::isEqual | ( | const IPosition & | other | ) | const |
Element-by-element comparison for equality.
It returns true if the lengths and all elements are equal.
Note that an important difference between this function and operator==() is that if the two IPositions have different lengths, this function returns false, instead of throwing an exception as operator==() does.
Referenced by casacore::checkArrayShapes(), casacore::LatticeBase::conform(), casacore::ArrayBase::conform2(), and casacore::TableExprNodeSet::toArray().
bool casacore::IPosition::isEqual | ( | const IPosition & | other, |
bool | skipDegeneratedAxes | ||
) | const |
Element-by-element comparison for equality.
It returns true if all elements are equal. When skipDegeneratedAxes
is true, axes with length 1 are skipped in both operands.
bool casacore::IPosition::isEqual | ( | const IPosition & | other, |
size_t | nrCompare | ||
) | const |
Element-by-element comparison for (partial) equality.
It returns true if the lengths and the first nrCompare
elements are equal.
bool casacore::IPosition::isSubSet | ( | const IPosition & | other | ) | const |
Return an IPosition containing the given axes only.
|
inline |
Index into the IPosition from the end.
By default the last value is returned. If the preprocessor symbol AIPS_ARRAY_INDEX_CHECK is defined, it will check if the index is not out of bounds.
Definition at line 611 of file IPosition.h.
References data_p, size_p, and throwIndexError().
|
inline |
Definition at line 621 of file IPosition.h.
References data_p, size_p, and throwIndexError().
|
inlinestatic |
Construct an IPosition that is initialized from a variable number of parameter.
The resulting size of the IPosition will equal the number of parameters specified.
In general, using the initializer list constructor should be preferred. Defining an initializer list inside macros is however not possible. In those cases, this method can be used to construct the IPosition.
Example: IPosition::Make(3, 5) creates an IPosition of size 2, with values 3 and 5. It is identical to IPosition{3, 5}. A program is ill-formed when narrowing of a parameter is required, causing a compiler warning or error.
Definition at line 172 of file IPosition.h.
|
inlinestatic |
Construct a default axis path consisting of the values 0.
. nrdim-1.
Definition at line 563 of file IPosition.h.
References IPosition().
|
static |
Construct a full axis path from a (partially) given axis path.
It fills the path with the non-given axis. It is checked if the given axis path is valid (i.e. if the axis are < nrdim and if they are not doubly defined). E.g.: in the 4D case an axis path [0,2] is returned as [0,2,1,3].
|
inline |
The number of elements in this IPosition.
Since IPosition objects use zero-based indexing, the maximum available index is nelements() - 1.
Definition at line 568 of file IPosition.h.
References size_p.
Referenced by casacore::ArrayPositionIterator::dimIter(), casacore::ArrayPositionIterator::ndim(), casacore::Slicer::ndim(), operator()(), and casacore::TSMCube::setLastColSlice().
IPosition casacore::IPosition::nonDegenerate | ( | size_t | startingAxis = 0 | ) | const |
This member functions return an IPosition which has degenerate (length==1) axes removed and the dimensionality reduced appropriately.
Only axes greater than startingAxis are considered (normally one wants to remove trailing axes.
The functions with argument ignoreAxes
do not consider the axes given in that argument.
bool casacore::IPosition::ok | ( | ) | const |
Is this IPosition consistent?
Make an IPosition by using only the specified elements of the current IPosition.
All values of axes
must be less than the number of elements of the current object.
IPosition ipos(4, 11, 12, 13, 14); ex1 is IPosition(3, 11, 12, 13); IPosition ex1 = ipos(IPosition(3,0,1,2); ex2 is IPosition(3, 12, 11) IPosition ex2 = ipos(IPosition(2,2,1); ex3 is IPosition(4,14,14,14,14) IPosition ex3 = ipos(IPosition(4,3,3,3,3);
|
inline |
Definition at line 591 of file IPosition.h.
References data_p, nelements(), and throwIndexError().
|
inline |
Definition at line 601 of file IPosition.h.
References data_p, nelements(), and throwIndexError().
void casacore::IPosition::operator*= | ( | const IPosition & | other | ) |
void casacore::IPosition::operator*= | ( | ssize_t | val | ) |
void casacore::IPosition::operator+= | ( | const IPosition & | other | ) |
Element-by-element arithmetic.
void casacore::IPosition::operator+= | ( | ssize_t | val | ) |
void casacore::IPosition::operator-= | ( | const IPosition & | other | ) |
void casacore::IPosition::operator-= | ( | ssize_t | val | ) |
void casacore::IPosition::operator/= | ( | const IPosition & | other | ) |
void casacore::IPosition::operator/= | ( | ssize_t | val | ) |
Makes this a copy of other.
When the dest is not of the same size, it will resize itself to be the same length as the source.
IPosition& casacore::IPosition::operator= | ( | ssize_t | value | ) |
Copy "value" into every position of this IPosition.
|
inline |
Index into the IPosition.
Indices are zero-based. If the preprocessor symbol AIPS_ARRAY_INDEX_CHECK is defined, operator() will check "index" to ensure it is not out of bounds. If this check fails, an AipsError will be thrown.
Definition at line 581 of file IPosition.h.
References data_p.
|
inline |
Definition at line 586 of file IPosition.h.
References data_p.
Make a list of axes which are the axes not given in axes
up to the given dimension.
void casacore::IPosition::prepend | ( | const IPosition & | other | ) |
Prepend this IPosition with another one (causing a resize).
long long casacore::IPosition::product | ( | ) | const |
Returns 0 if nelements() == 0, otherwise it returns the product of its elements.
Referenced by casacore::LatticeIndexer::nelements().
Return an IPosition where the given axes are reoved.
Referenced by casacore::MArrayMath_global_functions_MArray_mathematical_operations::partialArrayMath().
void casacore::IPosition::resize | ( | size_t | newSize, |
bool | copy = true |
||
) |
Old values are copied on resize if copy==true.
If the size increases, values beyond the former size are undefined.
Referenced by fill(), and casacore::TSMCube::setLastColSlice().
void casacore::IPosition::setFirst | ( | const IPosition & | other | ) |
void casacore::IPosition::setLast | ( | const IPosition & | other | ) |
|
inline |
Definition at line 572 of file IPosition.h.
References size_p.
Referenced by casacore::Array< T, Alloc >::checkBeforeResize(), casacore::ArrayMath_global_functions_Array_mathematical_operations::expandArray(), fill(), casacore::TableExprGroupAggr::getArray(), casacore::MArrayBase::ndim(), and casacore::TableExprNodeSet::toArray().
|
inline |
|
private |
Throw an index error exception.
Referenced by last(), and operator()().
std::string casacore::IPosition::toString | ( | ) | const |
Write the IPosition into a string.
TODO deprecate in favour of to_string(const IPosition&)
|
friend |
Definition at line 120 of file IPosition.h.
|
friend |
Write an IPosition to an ostream in a simple text form.
|
private |
Definition at line 437 of file IPosition.h.
|
private |
When the iposition is length BufferSize or less data is just buffer_p, avoiding calls to new and delete.
Definition at line 440 of file IPosition.h.
Referenced by begin(), copy(), end(), fill(), last(), operator()(), operator[](), and storage().
|
private |
Definition at line 436 of file IPosition.h.
Referenced by conform(), copy(), empty(), end(), last(), nelements(), and size().