Standard C++ Library Changes: Visual C++ .NET 2003
If you are upgrading a program that uses Standard C++ Library code that compiled in Visual C++ 6.0, you should be aware of the following issues:
reverse_iterator Changes
Some Iterators Are No Longer the Same as Pointers
MIN/MAX #define Change
reverse_iterator Changes
The names for some of the types defined by the Standard C++ Library reverse_iterator class have changed. Also, there are different template arguments for this class.
The following sample compiled in Visual C++ 6.0, but fails in the current version:
#include <iterator>
#include <vector>
typedef std::iterator<std::random_access_iterator_tag, char, int> random_it;
int main( )
{
char c;
// too many template args for VC7
typedef std::reverse_iterator< random_it, char, char&, char *, int > rev_it;
rev_it::reference_type x = c;
rev_it::pointer_type y = 0;
rev_it::iter_type z;
/*
// try the following code instead
typedef std::reverse_iterator< random_it > rev_it;
rev_it::reference a = c;
rev_it::pointer b = 0;
rev_it::iterator_type c1;
*/
}
Some Iterators Are No Longer the Same as Pointers
In some Standard C++ Library classes, iterators are no longer defined as pointer types.
The following sample compiled in Visual C++ 6.0, but fails on the indicated lines in the current version:
#include <string>
#include <vector>
#include <algorithm>
bool pred(int i) {
return true;
};
int main()
{
std::string str("test");
const char *pszstr = str.begin(); // LINE 8: INCORRECT
const char *pszStr2 = str.c_str(); // OK
const char *pszStr3 = &(*str.begin()); // OK
std::vector<int> v;
int *pint = std::remove_if(v.begin(), v.end(), pred); // LINE 13: INCORRECT
std::vector<int>::iterator iint = std::remove_if(v.begin(), v.end(), pred); // OK
}
MIN/MAX #define Change
The Standard C++ Library definition of _MIN and _MAX changed from:
#define _MAX _cpp_max
#define _MIN _cpp_min
to:
#define _MAX (max)
#define _MIN (min)
This makes definitions of std::_MIN invalid.
The following sample compiled in Visual C++ 6.0, but fails on the indicated line in the current version:
#include <xutility>
#include <stdlib.h>
using namespace std;
int main()
{
std::_MAX(3,4); // error
_MAX(4,5);
}