C++ console menu template

menu.hpp

#pragma once
#include <vector>
#include <iostream>
#include <iomanip>

using namespace std;

template <class T>
using MenuFunction = void(*)(T&);
template <class T>
using TryCatchFunction = void(*)(MenuFunction<T>&, T&);

template <class T>
class Menu {
public:
    Menu();
    Menu(T);
    void AddOption(string s, MenuFunction<T> f);
    void Run();
    void AddTryCatch(TryCatchFunction<T> f);

private:
    T _a;
    void menuWrite();
    vector<string> _text;
    vector<MenuFunction<T> > _function;
    TryCatchFunction<T> _tryCatch;
    bool _tryCatchExists;
};

template <class T>
Menu<T>::Menu()
{
    _tryCatchExists=false;
};
template <class T>
Menu<T>::Menu(T a)
{
    _tryCatchExists=false;
    _a = a;
};

template <class T>
void Menu<T>::Run()
{
    unsigned int n = 0;
    do{
        menuWrite();
        cout << endl << ">>>>" ; cin >> n;
        if(n>0&&n<=_function.size())
        {
            if(_tryCatchExists)
                _tryCatch(_function[n-1],_a);
            else
                _function[n-1](_a);
        }
    }while(n!=0);
};

template <class T>
void Menu<T>::AddOption(string s, MenuFunction<T> f)
{
    _text.push_back(s);
    _function.push_back(f);
};

template <class T>
void Menu<T>::menuWrite()
{
    cout << endl << endl;
    cout << "  0. - Vege" << endl;
    for(unsigned int i=0;i<_text.size();++i)
    {
        cout << setw(3)<<i+1 << ". - " << _text[i] << endl;
    }
};

template <class T>
void Menu<T>::AddTryCatch(TryCatchFunction<T> f)
{
    _tryCatch = f;
    _tryCatchExists = true;
}