need Help with "assertion Failed"

[youmair]

hi!
line:39 When I uncomment delete statement my program gives "debug assertion failed" only when using <string> type;
line:91 is not usually required but it also does the same;
Any help will be much appreciated;

//*************ArrStack.h******************
#include <iostream>
#include <string>
#pragma once
using namespace std;

template <class T>
class ArrStack
{
	enum { DEF_CAP = 100 };
private:
	T *arr;
	int max, t;
public:
	ArrStack(int cap = DEF_CAP);
	~ArrStack(void);

	bool empty(void);
	void push(T e);
	void pop(void);
	T top(void);
	int size(void);
	bool full(void);
	void maxPlus(void);
	void print(void);
};

template <class T>
ArrStack<T>::ArrStack(int cap)
{
	max = cap;
	arr = new T[max];
	t = -1;
}

template <class T>
ArrStack<T>::~ArrStack(void)
{
	//delete arr;				
}

template <class T>
bool ArrStack<T>::empty(void)
{
	return t == -1;
}

template <class T>
void ArrStack<T>::push(T e)
{
	if (full())
		maxPlus();
	arr[++t] = e;		
}

template <class T>
void ArrStack<T>::pop(void)
{
	if (!empty())
		t--; 
}

template <class T>
T ArrStack<T>::top(void)
{
	if (!empty())
		return arr[t];
}

template <class T>
int ArrStack<T>::size(void)
{
	return (t + 1);
}

template <class T>
bool ArrStack<T>::full(void)
{
	return size() == max;
}

template <class T>
void ArrStack<T>::maxPlus(void)
{
	T *temp = new T[max];
	temp = arr;
	max += 10;
	arr = new T[max];
	for (int i = 0 ; i < size(); i++)
		arr[i] = temp[i];
	//delete temp;
}

template <class T>
void ArrStack<T>::print(void)
{
	if (empty())
		return;
	cout << "(";
	for (int i = 0; i <= t; i++)
		cout << arr[i] << ", ";
	cout << "\b\b)" << endl;
}

// ***************main*****************
#include "ArrStack.h"

int main(void)
{
	ArrStack <string> obj;
	obj.push("a string");
	obj.push("is being printed");
	obj.print();
	return 0;
}

line:64 please guide me, What should top() return when stack is empty?? How an Exception is thrown?

[MiiNiPaa]

You should use delete[] arr; when dealing with arrays.

top() should probably either throw an exception or have an unspecified behavior.

#include <stdexcept>
//...
throw std::out_of_range("stack is empty");

[youmair]

Thank you MiiNiPaa
Problem Solved :)