christoph/lecture-operating-system-development
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update arraylist

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This commit is contained in:
Christoph Urlacher
2022-07-17 21:02:13 +02:00
parent 5dd23fc888
commit 671ea46711
1 changed files with 27 additions and 24 deletions
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51
c_os/user/lib/ArrayList.h
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@ -119,45 +119,48 @@ private:
} }
protected: protected:
Type* begin_ptr() override { typename Iterator::Type* begin_ptr() override {
return this->buffer; return this->buffer;
} }
Type* end_ptr() override { typename Iterator::Type* end_ptr() override {
return this->buffer + this->buffer_pos; return this->buffer + this->buffer_pos;
} }
public: public:
// Returns new pos // Returns new pos
unsigned int insert(Type e) override {
this->expand();
this->buffer[this->buffer_pos] = e;
this->buffer_pos = this->buffer_pos + 1;
return this->buffer_pos;
}
unsigned int insert_at(Type e, unsigned int i) override { unsigned int insert_at(Type e, unsigned int i) override {
if (i > this->buffer_pos) { if (i > this->size()) {
// Error: Space between elements // Error: Space between elements
return -1; return -1;
} }
if (i == this->buffer_pos) { if (i == this->size()) {
// Insert at end // Insert at end
this->insert(e); return this->insert_last(e);
return this->buffer_pos;
} }
this->copy_right(i); // Changes pos this->copy_right(i); // Changes pos
this->buffer[i] = e; this->buffer[i] = e;
return this->buffer_pos; return this->size();
}
unsigned int insert_first(Type e) override {
return this->insert_at(e, 0);
}
unsigned int insert_last(Type e) override {
this->expand();
this->buffer[this->size()] = e;
this->buffer_pos = this->buffer_pos + 1;
return this->size();
} }
// Returns removed element // Returns removed element
Type remove_at(unsigned int i) override { Type remove_at(unsigned int i) override {
if (i >= this->buffer_pos) { if (i >= this->size()) {
// ERROR: No element here // ERROR: No element here
return NULL; return NULL;
} }
@ -173,12 +176,12 @@ public:
Type remove_last() override { Type remove_last() override {
// If index -1 unsigned int will overflow and remove_at will catch that // If index -1 unsigned int will overflow and remove_at will catch that
return this->remove_at(this->buffer_pos - 1); return this->remove_at(this->size() - 1);
} }
// Returns true on success // Returns true on success
bool remove(Type e) override { bool remove(Type e) override {
for (unsigned int i = 0; i < this->buffer_pos; ++i) { for (unsigned int i = 0; i < this->size(); ++i) {
if (this->buffer[i] == e) { if (this->buffer[i] == e) {
this->copy_left(i); this->copy_left(i);
return true; return true;
@ -189,7 +192,7 @@ public:
} }
Type get(unsigned int i) const override { Type get(unsigned int i) const override {
if (i >= this->buffer_pos) { if (i >= this->size()) {
// ERROR: No element there // ERROR: No element there
return NULL; return NULL;
} }
@ -202,11 +205,11 @@ public:
} }
Type last() const override { Type last() const override {
return this->get(this->buffer_pos - 1); // Underflow gets catched by get(unsigned int i) return this->get(this->size() - 1); // Underflow gets catched by get(unsigned int i)
} }
bool empty() const override { bool empty() const override {
return this->buffer_pos == 0; return this->size() == 0;
} }
unsigned int size() const override { unsigned int size() const override {
@ -214,13 +217,13 @@ public:
} }
void print(OutStream& out) const override { void print(OutStream& out) const override {
if (this->buffer_pos == 0) { if (this->empty()) {
out << "Print List (0 elements)" << endl; out << "Print List (0 elements)" << endl;
return; return;
} }
out << "Print List (" << dec << this->buffer_pos << " elements): "; out << "Print List (" << dec << this->size() << " elements): ";
for (unsigned int i = 0; i < this->buffer_pos; ++i) { for (unsigned int i = 0; i < this->size(); ++i) {
out << dec << this->get(i) << " "; out << dec << this->get(i) << " ";
} }
out << endl; out << endl;