mirror of
git://gcc.gnu.org/git/gcc.git
synced 2025-02-04 08:39:31 +08:00
b2dad0e372
2000-04-21 Benjamin Kosnik <bkoz@redhat.com> * libstdc++-v3: New directory. From-SVN: r33317
86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
// -*- C++ -*- C math library.
|
|
|
|
// Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
|
// software; you can redistribute it and/or modify it under the
|
|
// terms of the GNU General Public License as published by the
|
|
// Free Software Foundation; either version 2, or (at your option)
|
|
// any later version.
|
|
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License along
|
|
// with this library; see the file COPYING. If not, write to the Free
|
|
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
// USA.
|
|
|
|
// As a special exception, you may use this file as part of a free software
|
|
// library without restriction. Specifically, if other files instantiate
|
|
// templates or use macros or inline functions from this file, or you compile
|
|
// this file and link it with other files to produce an executable, this
|
|
// file does not by itself cause the resulting executable to be covered by
|
|
// the GNU General Public License. This exception does not however
|
|
// invalidate any other reasons why the executable file might be covered by
|
|
// the GNU General Public License.
|
|
|
|
//
|
|
// ISO C++ 14882: 26.5 C library
|
|
// Code for signatures not found in the C library
|
|
//
|
|
|
|
#include <bits/std_cmath.h>
|
|
|
|
namespace std {
|
|
|
|
namespace {
|
|
template <typename T>
|
|
inline T pow_helper(T x, unsigned int y)
|
|
{
|
|
T z = y&1? x : 1;
|
|
while(y >>= 1)
|
|
{
|
|
x *= x;
|
|
if(y & 1) z *= x;
|
|
}
|
|
return z;
|
|
}
|
|
}
|
|
|
|
float
|
|
pow(float x, int y)
|
|
{
|
|
if(y < 0)
|
|
return 1.0f/pow_helper(x, -y);
|
|
else
|
|
return pow_helper(x, y);
|
|
}
|
|
|
|
double
|
|
pow(double x, int y)
|
|
{
|
|
if(y < 0)
|
|
return 1.0/pow_helper(x, -y);
|
|
else
|
|
return pow_helper(x, y);
|
|
}
|
|
|
|
long double
|
|
pow(long double x, int y)
|
|
{
|
|
if(y < 0)
|
|
return 1.0l/pow_helper(x, -y);
|
|
else
|
|
return pow_helper(x, y);
|
|
}
|
|
|
|
} // std
|
|
|
|
|
|
|
|
|
|
|