Odd errors when creating a Vector

[Kubani]

Hi to all,

The code below is part of a bigger program and it's not complete yet. And the bodies of these functions are deliberately empty:

T* allocate(int n); 
void deallocate(T* p, int n); 
void construct(T* p, const T& v); 
void destroy(T* p);  

And this is that code:

#include <iostream>
using namespace std;

template <class T> class My_allocator {
public:
	T* allocate(int n);  // allocate space for n objects of type T
	void deallocate(T* p, int n);  // deallocate n objects of type T starting at p

	void construct(T* p, const T& v);  // construct a T with the value v in p
	void destroy(T* p);  //  destroy the T in p
};

//-------------------------------------------------

template<class T>
T* My_allocator<T>::allocate(int n)
{
	return nullptr;
}

//------------------------------

template<class T>
void My_allocator<T>::deallocate(T * p, int n)
{
}

//------------------------------

template<class T>
void My_allocator<T>::construct(T * p, const T & v)
{
}

//------------------------------

template<class T>
void My_allocator<T>::destroy(T * p)
{
}

//------------------------------------------------

template <class T, class A = My_allocator<T> > 
class Vactor : public vector<T> {

	A alloc;
	int sz;
	T* elem;
	int space;

public:
	Vector() :vector<T>() {}
	Vector(int n) :vector<T>(n) {}
	Vector(int n, constT& v) :vector<T>(n, v) {}

	~Vector() { delete[] elem; }

	T& operator[](unsigned int n) // rather than return at(i);
	{
		if (i < 0 || this->size() <= i) throw Range_error(i);
		return vector<T>::operator[](i);
	}

	const T& operator[](unsigned int n) const
	{
		if (i < 0 || this->size() <= i) throw Range_error(i);
		return vector<T>::operator[](i);
	}

	void reverse(int);
	void push_back(const T&);
	void resize(int, T val = T());
	int size() const { return sz; }
	int capacity() const { return space; }
};

//------------------------------------------------

template <class T, class A>
void Vactor<T, A>::reverse(int newalloc)
{
	if (newalloc <= space) return;
	T* p = alloc.allocate(newalloc);
	for (int i = 0; i < sz; ++i) alloc.construct(&p[i], elem[i]);
	for (int i = 0; i < sz; ++i) alloc.destroy(&elem[i]);
	alloc.deallocate(elem, space);
	elem = p;
	space = newalloc;
}

//-------------------------------------------

template <class T, class A>
void Vactor<T, A>::push_back(const T& val)
{
	if (space == 0) reverse(8);
	else if (sz == space)reverse(2 * space);
	alloc.construct(&elem[sz], val);
	++sz;
}

//-------------------------------------

template <class T, class A>
void Vactor<T, A>::resize(int newsize, T val = T())
{
	reserve(newsize);
	for (int i = sz; i < newsize; ++i) alloc.construct(&elem[i], val);  // construct
	for (int i = newsize; i < sz; ++i) alloc.destroy(&elem[i]);  // destroy
	sz = newsize;
}

//--------------------------------

int main() {
	return 0;
}

I get these errors after running the code:
Error C2059 syntax error: ')' 53
Error C2334 unexpected token(s) preceding ':'; skipping apparent function body 53
Error C1004 unexpected end-of-file found test2 76


I tried to solve the issues but I don't know why I get these. Everything seems to be correct!

Would anyone please helm me?

PS: The vector<T> in line 53 is std::vector<T> but since I have put the line using namespace std; at the top of the code I didn't add std:: to the vector<T> there.

[Thomas1965]

Just some synthax errors:
Vactor instead of Vector
constT& instead of const T&

This compiles;

#include <iostream>
#include <vector>

using namespace std;

template <class T> 
class My_allocator 
{
public:
  T* allocate(int n);  // allocate space for n objects of type T
  void deallocate(T* p, int n);  // deallocate n objects of type T starting at p

  void construct(T* p, const T& v);  // construct a T with the value v in p
  void destroy(T* p);  //  destroy the T in p
};

//-------------------------------------------------

template<class T>
T* My_allocator<T>::allocate(int n)
{
  return nullptr;
}

//------------------------------

template<class T>
void My_allocator<T>::deallocate(T * p, int n)
{
}

//------------------------------

template<class T>
void My_allocator<T>::construct(T * p, const T & v)
{
}

//------------------------------

template<class T>
void My_allocator<T>::destroy(T * p)
{
}

//------------------------------------------------

template <class T, class A = My_allocator<T> > 
class Vector : public vector<T> 
{
  A alloc;
  int sz;
  T* elem;
  int space;

public:
  Vector() : vector<T>() {}
  Vector(int n) :vector<T>(n) {}
  Vector(int n, const T& v) :vector<T>(n, v) {}

  ~Vector() { delete[] elem; }

  T& operator[](unsigned int n) // rather than return at(i);
  {
    if (i < 0 || this->size() <= i) 
      throw Range_error(i);

    return vector<T>::operator[](i);
  }

  const T& operator[](unsigned int n) const
  {
    if (i < 0 || this->size() <= i) 
      throw Range_error(i);

    return vector<T>::operator[](i);
  }

  void reverse(int);
  void push_back(const T&);
  void resize(int, T val = T());
  int size() const { return sz; }
  int capacity() const { return space; }
};

//------------------------------------------------

template <class T, class A>
void Vector<T, A>::reverse(int newalloc)
{
  if (newalloc <= space) 
    return;
  T* p = alloc.allocate(newalloc);
  for (int i = 0; i < sz; ++i) 
    alloc.construct(&p[i], elem[i]);

  for (int i = 0; i < sz; ++i) 
    alloc.destroy(&elem[i]);

  alloc.deallocate(elem, space);
  elem = p;
  space = newalloc;
}

//-------------------------------------------

template <class T, class A>
void Vector<T, A>::push_back(const T& val)
{
  if (space == 0) 
    reverse(8);
  else if (sz == space)
    reverse(2 * space);

  alloc.construct(&elem[sz], val);
  ++sz;
}

//-------------------------------------

template <class T, class A>
void Vector<T, A>::resize(int newsize, T val = T())
{
  reserve(newsize);
  for (int i = sz; i < newsize; ++i) 
    alloc.construct(&elem[i], val);  // construct
  for (int i = newsize; i < sz; ++i) 
    alloc.destroy(&elem[i]);  // destroy
  sz = newsize;
}

//--------------------------------

int main() 
{
  return 0;
}

[Kubani]

Thank you very much dear Thomas.