error C2662 cannot convert 'this' pointer from 'const n' to 'n &'

[beakie]

Getting this error...

error C2662: 'Txt::stringlength' : cannot convert 'this' pointer from 'const Txt' to 'Txt &'

What does it mean, please?

class Txt {

	unsigned int length;
	char* text;

	Txt();

	Txt(char* t);

	~Txt();

	Txt operator+ (const char* t) const;

	unsigned int stringlength(char* t);

};



Txt::Txt() {
};

Txt::Txt(char* t) {
	length = stringlength(t);
	text = new char[length + 1];
	for (unsigned int i = 0; i <= length; i++) {
		text[i] = t[i];
	};
};

Txt::~Txt() {
	delete[] text;
};

Txt Txt::operator+ (const char* t) const
{
	unsigned int tlen = stringlength(t);

	Txt temp;
	temp.length = this->length + tlen;
	temp.text = new char[temp.length + 1];

	for (unsigned int i = 0; i < this->length; i++) {
		temp.text[i] = this->text[i];
	};

	for (unsigned int i = 0; i <= tlen; i++) {
		temp.text[i + this->length] = t[i];
	};

	return temp;
}

unsigned int Txt::stringlength(char* t) {
	unsigned int i = 0;
	while (t[i] != 0) {
		i++;
	}
	return i;
}

Cheers

[vlad from moscow]

You may not apply function stringlength to a pointter that refers to const char.

Txt Txt::operator+ (const char* t) const
{
unsigned int tlen = stringlength(t);