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| | Добрый день!
есть код, на который компилятор билдера 5го ругается
на выделеную строку в коде выдает ошибку(хотя вроде корректно написано :()
error---E2061 Friends must be functions or classes
вот код
#ifndef __MATRIX_H__
#define __MATRIX_H__
#include <stdexcept>
#include <cassert>
template <class T>
class Matrix
{
T* data;
unsigned int rows;
unsigned int cols;
T* new_copy(const T* src, size_t src_size, size_t dst_size)
{
assert(dst_size >= src_size);
T* dest = new T[dst_size];
try
{
std::copy(src, src + src_size, dest);
}
catch(...)
{
delete[] dest;
throw;
}
return dest;
}
public:
Matrix(unsigned int _rows, unsigned int _cols):
rows(_rows),
cols(_cols)
{
assert(rows > 0);
assert(cols > 0);
if (rows == 0 || cols == 0)
throw std::invalid_argument("Invalid argument in Matrix ctor");
data = new T[rows * cols];
if (!data)
throw std::runtime_error("Not enough memory in Matrix ctor");
}
~Matrix()
{
delete[] data;
}
Matrix(const Matrix& m):
data(new_copy(m.data, m.rows * m.cols, m.rows * m.cols)),
rows(m.rows),
cols(m.cols)
{
}
Matrix& operator=(const Matrix& m)
{
if (this != &m)
{
T* temp = new_copy(m.data, m.rows * m.cols, m.rows * m.cols);
delete[] data;
data = temp;
rows = m.rows;
cols = m.cols;
}
return *this;
}
template<class U>
class Helper
{
Matrix<U>& matrix;
unsigned int i;
Helper(Matrix<U>& _mc, unsigned int _i): matrix(_mc), i(_i) {};
Helper(const Matrix<U>& _mc, unsigned int _i): matrix(const_cast<Matrix&>(_mc)), i(_i) {};
Helper(const Helper&);
Helper& operator=(const Helper&);
friend class Matrix<U>;
public:
U& operator[](unsigned int k) const
{
assert(i < matrix.rows);
assert(k < matrix.cols);
if (i >= matrix.rows || k >= matrix.cols)
throw std::range_error("Range error in Matrix::Helper::operator[]() const");
return matrix.data[matrix.cols * i + k];
}
U& operator[](unsigned int k)
{
assert(i < matrix.rows);
assert(k < matrix.cols);
if (i >= matrix.rows || k >= matrix.cols)
throw std::range_error("Range error in Matrix::Helper::operator[]()");
return matrix.data[matrix.cols * i + k];
}
};
Helper<T> operator[](unsigned int i) const
{
assert(i < rows);
if (i >= rows)
throw std::range_error("Range error in Matrix::operator[]() const");
return Helper<T>(*this, i);
}
Helper<T> operator[](unsigned int i)
{
assert(i < rows);
if (i >= rows)
throw std::range_error("Range error in Matrix::operator[]()");
return Helper<T>(*this, i);
}
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