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#include "NaturalNumbers.h"
#include <cstring>
/* Private */
void NaturalNumbers::copyFrom(const NaturalNumbers& other) {
this->nameLength = other.nameLength;
this->elementsCount = other.elementsCount;
this->name = new char[this->nameLength];
this->elements = new int[this->elementsCount];
strcpy(this->name, other.name);
for (unsigned i = 0; i < this->elementsCount; i++)
this->elements[i] = other.elements[i];
}
void NaturalNumbers::free() {
delete[] elements;
delete[] name;
}
void NaturalNumbers::move(NaturalNumbers&& other) {
this->elementsCount = other.elementsCount;
this->nameLength = other.nameLength;
this->name = other.name;
other.name = nullptr;
this->elements = other.elements;
other.elements = nullptr;
}
void NaturalNumbers::resize() {
unsigned newLength = (this->elementsLength == 0) ? 8 : this->elementsLength << 1;
int* largerElementsArray = new int[newLength];
for (int i = 0; i < this->elementsLength; i++)
largerElementsArray[i] = this->elements[i];
delete[] this->elements;
this->elements = largerElementsArray;
this->elementsLength = newLength;
}
int NaturalNumbers::indexOfNum(int number) const {
for (unsigned i = 0; i < this->elementsCount; i++) {
if (this->elements[i] == number)
return i;
}
return -1;
}
/* Public */
NaturalNumbers::NaturalNumbers() : NaturalNumbers(nullptr, 0, "Empty set")
{}
NaturalNumbers::NaturalNumbers(const int* elements, unsigned elementsCount, const char* name) {
this->elementsCount = this->elementsLength = 0;
this->elements = nullptr;
for (unsigned i = 0; i < elementsCount; i++) {
this->addElement(elements[i]);
}
this->name = nullptr;
this->set_name(name);
}
NaturalNumbers::~NaturalNumbers() {
this->free();
}
NaturalNumbers::NaturalNumbers(const NaturalNumbers& other) {
copyFrom(other);
}
NaturalNumbers& NaturalNumbers::operator=(const NaturalNumbers& other) {
if (this != &other) {
free();
copyFrom(other);
}
return *this;
}
bool NaturalNumbers::operator[](int number) const {
return this->indexOfNum(number) > -1;
}
NaturalNumbers& NaturalNumbers::operator+=(const NaturalNumbers& other) {
for (unsigned i = 0; i < other.elementsCount; i++) {
this->addElement(other.elements[i]);
}
unsigned newNameLength = 19 + this->nameLength + other.nameLength;
char* newName = new char[newNameLength];
strcat(newName, "Union of \'");
strcat(newName, this->name);
strcat(newName, "\' and \'");
strcat(newName, other.name);
strcat(newName, "\'");
delete[] this->name;
this->name = newName;
this->nameLength = newNameLength;
return *this;
}
const int* NaturalNumbers::get_elements() const {
return this->elements;
}
bool NaturalNumbers::addElement(int number) {
if (indexOfNum(number) == -1 && number > -1) {
if (this->elementsLength == this->elementsCount)
this->resize();
this->elements[this->elementsCount++] = number;
return true;
}
return false;
}
unsigned NaturalNumbers::get_elementsCount() const {
return this->elementsCount;
}
const char* NaturalNumbers::get_name() const {
return this->name;
}
void NaturalNumbers::set_name(const char* newName) {
this->nameLength = strlen(newName);
delete[] this->name;
this->name = new char[this->nameLength];
strcpy(this->name, newName);
}
/* External functions */
NaturalNumbers operator+(const NaturalNumbers& lhs, const NaturalNumbers& rhs) {
NaturalNumbers copy(lhs);
copy += rhs;
return copy;
}
std::ostream& operator<<(std::ostream& ostr, const NaturalNumbers& numbers) {
ostr << numbers.get_name() << " {";
if (numbers.get_elementsCount() > 0) {
for (int i = 0; i < numbers.get_elementsCount() - 1; i++)
ostr << numbers.get_elements()[i] << ", ";
ostr << numbers.get_elements()[numbers.get_elementsCount() - 1];
}
ostr << "}";
return ostr;
}
std::istream& operator>>(std::istream& istr, NaturalNumbers& numbers) {
unsigned count, buffer;
istr >> count;
while (count > 0) {
istr >> buffer;
numbers.addElement(buffer);
count--;
}
return istr;
}
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