String_cpp/String.cpp at master · Rickard31/String_cpp · GitHub

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#include "String.h"
#include <cstring>
#include <cassert>

String::String(const char *charArr) : _string{new char[strlen(charArr) + 1]}, _length{strlen(charArr)} {
    strcpy(_string, charArr);
    assert(_length == strlen(_string));
}

String::String(const char ch) : _string{new char[2]}, _length{1} {
    _string[0] = ch;
    _string[1] = '\0';
    assert(_length == strlen(_string));
}

String::String(const std::string &str) : String{str.c_str()} {}

String::String(const String &other) : _string{new char[other.length() + 1]}, _length{other.length()} {
    strcpy(_string, other.c_string());
}

String::~String() {
    delete[] _string;
}

String &String::operator=(const String &other) {
    if (this == &other)
        return *this;
    return this->operator=(other.c_string());
}

String &String::operator=(const std::string &str) {
    return this->operator=(str.c_str());
}

String &String::operator=(const char *charArr) {
    if (_string == charArr)
        return *this;
    size_t newCharLen{strlen(charArr)};
    char *temp{new char[newCharLen + 1]};
    strcpy(temp, charArr);
    assert(temp[newCharLen] == '\0');
    assert(strlen(charArr) == strlen(temp));
    delete[] _string;
    _string = temp;
    _length = newCharLen;
    return *this;
}

String &String::operator=(const char ch) {
    delete[] _string;
    _string = new char[2];
    _string[0] = ch;
    _string[1] = '\0';
    _length = 1;
    return *this;
}

String &String::operator+=(const String &other) {
    return *this += other.c_string();
}

String &String::operator+=(const std::string &str) {
    return *this += str.c_str();
}

String &String::operator+=(const char *charArr) {
    size_t newLen{length() + strlen(charArr)};
    char *temp {new char[newLen + 1]};
    strcpy(temp, _string);
    strcat(temp, charArr);
    delete[] _string;
    _string = temp;
    _length = newLen;
    return *this;
}

char String::operator[](const size_t index) const {
    if (length() <= index)
        throw "Invalid index";
    return _string[index];
}

char &String::operator[](const size_t index) {
    if (length() <= index)
        throw "Invalid index";
    return _string[index];
}

size_t String::length() const {
    assert(_length == strlen(_string));
    return _length;
}

const char *String::c_string() const {
    assert(_string[_length] == '\0');
    return _string;
}

std::string String::std_string() const {
    return std::string(_string);
}


std::ostream &operator<<(std::ostream &os, const String &str) {
    return os << str.c_string();
}

const String operator+(const String &a, const String &b) {
    String temp(a);
    temp += b;
    return temp;
}

const String operator+(const String &a, const char *const b) {
    String temp(a);
    temp += b;
    return temp;
}

const String operator+(const String &a, const std::string &b) {
    String temp(a);
    temp += b;
    return temp;
}

bool operator==(const String &a, const String &b) {
    return strcmp(a.c_string(), b.c_string()) == 0;
}

bool operator==(const String &a, const std::string &b) {
    return strcmp(a.c_string(), b.c_str()) == 0;
}

bool operator==(const std::string &a, const String &b) {
    return b == a;
}

bool operator==(const String &a, const char *const b) {
    return strcmp(a.c_string(), b) == 0;
}

bool operator==(const char *const a, const String &b) {
    return b == a;
}

bool operator!=(const String &a, const String &b) {
    return !(a == b);
}

bool operator!=(const String &a, const std::string &b) {
    return !(a == b);
}

bool operator!=(const std::string &a, const String &b) {
    return !(a == b);
}

bool operator!=(const String &a, const char *const b) {
    return !(a == b);
}

bool operator!=(const char *const a, const String &b) {
    return !(a == b);
}

bool operator<(const String &a, const String &b) {
    return strcmp(a.c_string(), b.c_string()) < 0;
}

bool operator<(const String &a, const std::string &b) {
    return strcmp(a.c_string(), b.c_str()) < 0;
}

bool operator<(const std::string &a, const String &b) {
    return !(b >= a);
}

bool operator<(const String &a, const char *const b) {
    return strcmp(a.c_string(), b) < 0;
}

bool operator<(const char *const a, const String &b) {
    return !(b >= a);
}

bool operator>(const String &a, const String &b) {
    return strcmp(a.c_string(), b.c_string()) > 0;
}

bool operator>(const String &a, const std::string &b) {
    return strcmp(a.c_string(), b.c_str()) > 0;
}

bool operator>(const std::string &a, const String &b) {
    return !(b <= a);
}

bool operator>(const String &a, const char *const b) {
    return strcmp(a.c_string(), b) > 0;
}

bool operator>(const char *const a, const String &b) {
    return !(b >= a);
}

bool operator<=(const String &a, const String &b) {
    return !(a > b);
}

bool operator<=(const String &a, const std::string &b) {
    return !(a > b);
}

bool operator<=(const std::string &a, const String &b) {
    return b >= a;
}

bool operator<=(const String &a, const char *const b) {
    return strcmp(a.c_string(), b) <= 0;
}

bool operator<=(const char *const a, const String &b) {
    return b >= a;
}

bool operator>=(const String &a, const String &b) {
    return !(a < b);
}

bool operator>=(const String &a, const std::string &b) {
    return !(a < b);
}

bool operator>=(const std::string &a, const String &b) {
    return b <= a;
}

bool operator>=(const String &a, const char *const b) {
    return !(a < b);
}

bool operator>=(const char *const a, const String &b) {
    return b <= a;
}