libstdc++/3181: Unable to use sqrt,cos,sin,... with int argument.

[pete@toyon.com]

>Number:         3181
>Category:       libstdc++
>Synopsis:       Unable to use sqrt,cos,sin,... with int argument.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 13 16:46:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Pete Stieber
>Release:        gcc version 3.1 20010611 (experimental)
>Organization:
>Environment:
i686-pc-linux-gnu
Red Hat 7.1
>Description:
Error compiling std library math functions with in arguments. Automatic type conversion not working:

test.cpp: In function `int main()':
test.cpp:11: call of overloaded `sqrt(int&)' is ambiguous
/usr/include/bits/mathcalls.h:146: candidates are: double sqrt(double)
/usr/local/include/g++-v3/bits/std_cmath.h:461:                 long double    std::sqrt(long double)
/usr/local/include/g++-v3/bits/std_cmath.h:455:                 float    std::sqrt(float)
>How-To-Repeat:
gcc test.cpp
>Fix:
I have to cast int/long/... instead of automatic conversion.
>Release-Note:
>Audit-Trail:
>Unformatted:
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Content-Type: text/plain; name="test.cpp"
Content-Disposition: inline; filename="test.cpp"

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
  int i = -1;
  double Ans;
  // All of the functions have the problem, but we will use sqrt to illustrate.
  Ans = sqrt(i);
  cout << Ans << endl;
//  Ans = cos(i);
//  cout << Ans << endl;
//  Ans = sin(i);
//  cout << Ans << endl;
//  Ans = tan(i);
//  cout << Ans << endl;
//  Ans = acos(i);
//  cout << Ans << endl;
//  Ans = asin(i);
//  cout << Ans << endl;
//  Ans = atan(i);
//  cout << Ans << endl;

  return 1;
}