C headers and std namespace

[Anthony Williams]

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I have some code which I am moving from libstdc++-2 to libstdc++-3.
In order to eliminate the need for putting std:: in front of
everything, I am putting "using namespace std" at the top of each
source file.

However, some C library functions (notably those from ctype.h) are
now causing clashes because they are included in the global namespace
AND namespace std.

I am using the new C++-style header <cctype>

e.g.

#include <cctype>

using namespace std;

int main()
{
  bool x=false;

  if(isdigit('1'))
    x=true;

  return 0;
}

Ambiguous call to isdigit(char&):
options are:
isdigit(int)
std::isdigit(int)

Anthony

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