Esa es la razón por la que hice la clase String. No está pensada para proyectos profesionales (para ellos, deberías utilizar la string de la librería standard), sino como una ayuda para aprender C++.

class String
{
	char *m_pszString;	//Allocated buffer
	int m_nAllocated;	//Allocated length

public:
	//Construction and destruction
	String() { /* ... */ }
	~String() { /* ... */ }

	//Copy constructors
	String(const char *pszString) { /* ... */ }
	String(const String& rsString) { /* ... */ }

	//Operators (assignment)
	String& operator=(const char *pszString);
	String& operator=(const String& rsString) { /* ... */ }

	//Operators (concatenation)
	String& operator+=(const char *pszString);
	String& operator+=(String& rsString) { /* ... */ }
	String operator+(String rsString);

	//Operators (comparison)
	bool operator<(String sString) { /* ... */ }
	bool operator<=(String sString) { /* ... */ }

	bool operator>(String sString) { /* ... */ }
	bool operator>=(String sString) { /* ... */ }

	bool operator==(String sString) { /* ... */ }
	bool operator!=(String sString) { /* ... */ }

	//Operations
	void Clear();
	String Lower() { /* ... */ }
	String Upper() { /* ... */ }

	//Information
	int Length() { /* ... */ }

	//Cast operators
	operator const char*() { /* ... */ }

protected:	//Helper functions
	/* ... */
};

//Output e input
std::ostream& operator<<(std::ostream& oStream, String& rsString);
std::istream& operator>>(std::istream& iStream, String& rsString);

Este es un proyecto de ejemplo hecho para explicar la utilización de la clase String.

#include <iostream>
	using std::cout;
	using std::cin;
	using std::endl;
#include "String.h"

using namespace std;

int main(int argc, char *argv[])
{
	cout << "String sample project" << endl;
	cout << "---------------------" << endl << endl;

	String a("This"), b("is"), c("a"), d("test");
	String e = a + " " + b + " " + c + " " + d;

	cout << "String parts:" << endl;
	cout << '\t' << a << endl;
	cout << '\t' << b << endl;
	cout << '\t' << c << endl;
	cout << '\t' << d << endl << endl;

	cout << "Concatenated with spaces:" << endl;
	cout << '\t' << e << endl << endl;

	String f, g;

	cout << "Please input a string (empty to break): ";
	cin >> f;
	cout << "Please input other string (empty to break): ";
	cin >> g;

	cout << endl;

	cout << "1st string (" << f << ") is " << f.Length() << " chars long." << endl;
	cout << "2nd string (" << g << ") is " << g.Length() << " chars long." << endl;

	cout << endl;

	cout << "1st string in lowercase is " << f.Lower() << endl;
	cout << "1st string in uppercase is " << f.Upper() << endl << endl;

	cout << "2nd string in lowercase is " << g.Lower() << endl;
	cout << "2nd string in uppercase is " << g.Upper() << endl << endl;

	cout << "1 < 2\t=> " << (f<g?"true":"false") << endl;
	cout << "1 <= 2\t=> " << (f<=g?"true":"false") << endl;
	cout << "1 > 2\t=> " << (f>g?"true":"false") << endl;
	cout << "1 >= 2\t=> " << (f>=g?"true":"false") << endl;
	cout << "1 == 2\t=> " << (f==g?"true":"false") << endl;
	cout << "1 != 2\t=> " << (f!=g?"true":"false") << endl << endl;

	if (f == g)
		cout << "Strings are equal." << endl;
	else
		cout << "Strings are not equal." << endl;

	cout << endl;

	cout << "1+2\t=> " << f+g << endl;
	cout << "2+1\t=> " << g+f << endl;

	cout << endl;

    return 0;
}

Y esta su salida:

String sample project
---------------------

String parts:
        This
        is
        a
        test

Concatenated with spaces:
        This is a test

Please input a string (empty to break): Hello, string 1
Please input other string (empty to break): Phrase 2

1st string (Hello, string 1) is 15 chars long.
2nd string (Phrase 2) is 8 chars long.

1st string in lowercase is hello, string 1
1st string in uppercase is HELLO, STRING 1

2nd string in lowercase is phrase 2
2nd string in uppercase is PHRASE 2

1 < 2   => false
1 <= 2  => false
1 > 2   => true
1 >= 2  => true
1 == 2  => false
1 != 2  => true

Strings are not equal.

1+2     => Hello, string 1Phrase 2
2+1     => Phrase 2Hello, string 1

El código es completamente portable.

Ha sido desarrollado, compilado y testeado utilizando wxDev-C++ para Windows con el compilador MinGW (incluído en el paquete). En Linux, fue compilado utilizando el compilador GNU GCC.

String está liberado bajo la licencia GNU GPL v3 (attached)…

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