280 lines
7.7 KiB
C++
280 lines
7.7 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 1999-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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*/
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//
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// UVector64 is a class implementing a vector of 64 bit integers.
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// It is similar to UVector32, but holds int64_t values rather than int32_t.
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// Most of the code is unchanged from UVector.
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//
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#ifndef UVECTOR64_H
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#define UVECTOR64_H
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#include "unicode/utypes.h"
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#include "unicode/uobject.h"
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#include "uhash.h"
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#include "uassert.h"
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U_NAMESPACE_BEGIN
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/**
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* <p>Ultralightweight C++ implementation of an <tt>int64_t</tt> vector
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* that has a subset of methods from UVector32
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*
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* <p>This is a very simple implementation, written to satisfy an
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* immediate porting need. As such, it is not completely fleshed out,
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* and it aims for simplicity and conformity. Nonetheless, it serves
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* its purpose (porting code from java that uses java.util.Vector)
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* well, and it could be easily made into a more robust vector class.
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*
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* <p><b>Design notes</b>
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*
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* <p>There is index bounds checking, but little is done about it. If
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* indices are out of bounds, either nothing happens, or zero is
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* returned. We <em>do</em> avoid indexing off into the weeds.
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*
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* <p>There is detection of out of memory, but the handling is very
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* coarse-grained -- similar to UnicodeString's protocol, but even
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* coarser. The class contains <em>one static flag</em> that is set
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* when any call to <tt>new</tt> returns zero. This allows the caller
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* to use several vectors and make just one check at the end to see if
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* a memory failure occurred. This is more efficient than making a
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* check after each call on each vector when doing many operations on
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* multiple vectors. The single static flag works best when memory
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* failures are infrequent, and when recovery options are limited or
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* nonexistent.
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*
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* <p><b>To do</b>
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*
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* <p>Improve the handling of index out of bounds errors.
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*
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*/
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class U_COMMON_API UVector64 : public UObject {
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private:
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int32_t count;
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int32_t capacity;
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int32_t maxCapacity; // Limit beyond which capacity is not permitted to grow.
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int64_t* elements;
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public:
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UVector64(UErrorCode &status);
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UVector64(int32_t initialCapacity, UErrorCode &status);
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virtual ~UVector64();
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/**
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* Assign this object to another (make this a copy of 'other').
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* Use the 'assign' function to assign each element.
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*/
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void assign(const UVector64& other, UErrorCode &ec);
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/**
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* Compare this vector with another. They will be considered
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* equal if they are of the same size and all elements are equal,
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* as compared using this object's comparer.
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*/
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bool operator==(const UVector64& other);
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/**
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* Equivalent to !operator==()
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*/
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inline bool operator!=(const UVector64& other);
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//------------------------------------------------------------
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// subset of java.util.Vector API
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//------------------------------------------------------------
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inline void addElement(int64_t elem, UErrorCode &status);
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void setElementAt(int64_t elem, int32_t index);
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void insertElementAt(int64_t elem, int32_t index, UErrorCode &status);
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inline int64_t elementAti(int32_t index) const;
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//UBool equals(const UVector64 &other) const;
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inline int64_t lastElementi(void) const;
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//int32_t indexOf(int64_t elem, int32_t startIndex = 0) const;
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//UBool contains(int64_t elem) const;
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//UBool containsAll(const UVector64& other) const;
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//UBool removeAll(const UVector64& other);
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//UBool retainAll(const UVector64& other);
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//void removeElementAt(int32_t index);
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void removeAllElements();
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inline int32_t size(void) const;
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inline UBool isEmpty(void) const { return count == 0; }
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// Inline. Use this one for speedy size check.
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inline UBool ensureCapacity(int32_t minimumCapacity, UErrorCode &status);
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// Out-of-line, handles actual growth. Called by ensureCapacity() when necessary.
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UBool expandCapacity(int32_t minimumCapacity, UErrorCode &status);
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/**
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* Change the size of this vector as follows: If newSize is
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* smaller, then truncate the array, possibly deleting held
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* elements for i >= newSize. If newSize is larger, grow the
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* array, filling in new slows with zero.
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*/
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void setSize(int32_t newSize);
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//------------------------------------------------------------
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// New API
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//------------------------------------------------------------
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//UBool containsNone(const UVector64& other) const;
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//void sortedInsert(int64_t elem, UErrorCode& ec);
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/**
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* Returns a pointer to the internal array holding the vector.
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*/
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inline int64_t *getBuffer() const;
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/**
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* Set the maximum allowed buffer capacity for this vector/stack.
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* Default with no limit set is unlimited, go until malloc() fails.
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* A Limit of zero means unlimited capacity.
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* Units are vector elements (64 bits each), not bytes.
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*/
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void setMaxCapacity(int32_t limit);
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/**
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* ICU "poor man's RTTI", returns a UClassID for this class.
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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/**
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* ICU "poor man's RTTI", returns a UClassID for the actual class.
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*/
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virtual UClassID getDynamicClassID() const override;
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private:
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void _init(int32_t initialCapacity, UErrorCode &status);
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// Disallow
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UVector64(const UVector64&) = delete;
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// Disallow
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UVector64& operator=(const UVector64&) = delete;
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// API Functions for Stack operations.
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// In the original UVector, these were in a separate derived class, UStack.
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// Here in UVector64, they are all together.
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public:
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//UBool empty(void) const; // TODO: redundant, same as empty(). Remove it?
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//int64_t peeki(void) const;
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inline int64_t popi(void);
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inline int64_t push(int64_t i, UErrorCode &status);
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inline int64_t *reserveBlock(int32_t size, UErrorCode &status);
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inline int64_t *popFrame(int32_t size);
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};
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// UVector64 inlines
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inline UBool UVector64::ensureCapacity(int32_t minimumCapacity, UErrorCode &status) {
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if ((minimumCapacity >= 0) && (capacity >= minimumCapacity)) {
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return true;
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} else {
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return expandCapacity(minimumCapacity, status);
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}
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}
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inline int64_t UVector64::elementAti(int32_t index) const {
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return (0 <= index && index < count) ? elements[index] : 0;
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}
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inline void UVector64::addElement(int64_t elem, UErrorCode &status) {
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if (ensureCapacity(count + 1, status)) {
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elements[count] = elem;
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count++;
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}
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}
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inline int64_t *UVector64::reserveBlock(int32_t size, UErrorCode &status) {
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if (ensureCapacity(count+size, status) == false) {
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return NULL;
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}
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int64_t *rp = elements+count;
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count += size;
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return rp;
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}
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inline int64_t *UVector64::popFrame(int32_t size) {
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U_ASSERT(count >= size);
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count -= size;
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if (count < 0) {
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count = 0;
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}
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return elements+count-size;
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}
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inline int32_t UVector64::size(void) const {
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return count;
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}
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inline int64_t UVector64::lastElementi(void) const {
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return elementAti(count-1);
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}
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inline bool UVector64::operator!=(const UVector64& other) {
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return !operator==(other);
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}
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inline int64_t *UVector64::getBuffer() const {
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return elements;
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}
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// UStack inlines
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inline int64_t UVector64::push(int64_t i, UErrorCode &status) {
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addElement(i, status);
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return i;
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}
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inline int64_t UVector64::popi(void) {
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int64_t result = 0;
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if (count > 0) {
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count--;
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result = elements[count];
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}
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return result;
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}
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U_NAMESPACE_END
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#endif
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