String.h

#pragma once

#include <iostream>
#include <stdexcept>

class String
{
public:

    friend const String operator+(const String&, const String&);
    friend const String operator+(const String&, const char*);
    friend std::ostream& operator<<(std::ostream&, const String&);

    String(size_t size = 0);
    String(unsigned int, unsigned int);
    String(const String&);
    String(const char*);
    String(String&&) noexcept;

    ~String() { dealloc(); }

    String& operator=(const String&);
    String& operator=(String&& rv) noexcept;
    String& operator=(const char*);
    String& operator+=(const String&);
    String& operator+=(const char*);
    char& operator[](const size_t) const;
    bool operator<(const String&) const;
    bool operator>(const String&) const;
    bool operator==(const String&) const;
    bool operator<(const char*) const;
    bool operator>(const char*) const;
    bool operator==(const char*) const;
    String& operator++();
    String& operator--();

    bool isEmpty() const { return data == nullptr; }
    size_t size_() const { return this->size; }

private:

    size_t get_size(const char*) const;
    void alloc(const size_t);
    void dealloc();
    void copy(const char*);
    void copy(const String&);

    char* data;
    size_t size;
};