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#include "String.h"
#include <cstring>
void String::free() {
delete[] str;
}
void String::copyFrom(const String& other) {
this->str = new char[strlen(other.str) + 1];
strcpy(this->str, other.str);
}
String::String() {
str = nullptr;
}
String::~String() {
free();
}
String::String(const String& other) {
copyFrom(other);
}
String& String::operator=(const String& other) {
if (this != &other) {
free();
copyFrom(other);
}
return *this;
}
String::String(String&& other) {
this->str = other.str;
}
String& String::operator=(String&& other) {
if (this != &other) {
free();
this->str = other.str;
}
return *this;
}
bool operator==(const String& left, const String& right) {
int i;
for (i = 0; left.str[i] != '\0' && right.str[i] != '\0'; i++) {
if (left.str[i] != right.str[i])
return false;
}
return left.str[i] == '\0' && right.str[i] == '\0';
}
bool operator!=(const String& left, const String& right) {
return !(left == right);
}
String operator+(const String& left, const String& right) {
String concat;
concat.str = new char[strlen(left.str) + strlen(right.str) + 1];
int i;
for (i = 0; left.str[i] != '\0'; i++) {
concat.str[i] = left.str[i];
}
int j;
for (j = 0; right.str[j] != '\0'; j++) {
concat.str[i+j] = right.str[j];
}
return concat;
}
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