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/*!
* \file
* \brief Miscellaneous functions - header file
* \author Tony Ottosson, Adam Piatyszek and Conrad Sanderson
*
* -------------------------------------------------------------------------
*
* IT++ - C++ library of mathematical, signal processing, speech processing,
* and communications classes and functions
*
* Copyright (C) 1995-2008 (see AUTHORS file for a list of contributors)
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* -------------------------------------------------------------------------
*/
#ifndef MISC_H
#define MISC_H
#ifndef _MSC_VER
# include <itpp/config.h>
#else
# include <itpp/config_msvc.h>
#endif
#include <complex>
#include <string>
#include <limits>
namespace std {
//! \cond
#ifndef HAVE_STD_ISINF
#if (HAVE_DECL_ISINF == 1) || defined(HAVE_ISINF)
inline int isinf(double x) { return ::isinf(x); }
#elif defined(FPCLASS)
inline int isinf(double x)
{
if (::fpclass(a) == FP_NINF) return -1;
else if (::fpclass(a) == FP_PINF) return 1;
else return 0;
}
#else
inline int isinf(double x)
{
if ((x == x) && ((x - x) != 0.0)) return (x < 0.0 ? -1 : 1);
else return 0;
}
#endif // #if (HAVE_DECL_ISINF == 1) || defined(HAVE_ISINF)
# define HAVE_STD_ISINF 1
#endif // #ifndef HAVE_STD_ISINF
#ifndef HAVE_STD_ISNAN
#if (HAVE_DECL_ISNAN == 1) || defined(HAVE_ISNAN)
inline int isnan(double x) { return ::isnan(x); }
#else
inline int isnan(double x) { return ((x != x) ? 1 : 0); }
#endif // #if (HAVE_DECL_ISNAN == 1) || defined(HAVE_ISNAN)
# define HAVE_STD_ISNAN 1
#endif // #ifndef HAVE_STD_ISNAN
#ifndef HAVE_STD_ISFINITE
#if (HAVE_DECL_ISFINITE == 1) || defined(HAVE_ISFINITE)
inline int isfinite(double x) { return ::isfinite(x); }
#elif defined(HAVE_FINITE)
inline int isfinite(double x) { return ::finite(x); }
#else
inline int isfinite(double x)
{
return ((!std::isnan(x) && !std::isinf(x)) ? 1 : 0);
}
#endif // #if (HAVE_DECL_ISFINITE == 1) || defined(HAVE_ISFINITE)
# define HAVE_STD_ISFINITE 1
#endif // #ifndef HAVE_STD_ISFINITE
//! \endcond
//! Output stream operator for complex numbers
template <class T>
std::ostream& operator<<(std::ostream &os, const std::complex<T> &x)
{
os << x.real();
ios::fmtflags saved_format = os.setf(ios::showpos);
os << x.imag();
os.setf(saved_format, ios::showpos);
return os << 'i';
}
//! Input stream operator for complex numbers
template <class T>
std::istream& operator>>(std::istream &is, std::complex<T> &x)
{
T re, im;
char c;
is >> c;
if (c == '(') {
is >> re >> c;
if (c == ',') {
is >> im >> c;
if (c == ')') {
x = complex<T>(re, im);
} else {
is.setstate(ios_base::failbit);
}
} else if (c == ')') {
x = complex<T>(re, T(0));
} else {
is.setstate(ios_base::failbit);
}
} else {
is.putback(c);
is >> re;
if (!is.eof() && ((c = is.peek()) == '+' || c == '-')) {
is >> im >> c;
if (c == 'i') {
x = complex<T>(re, im);
} else {
is.setstate(ios_base::failbit);
}
} else {
x = complex<T>(re, T(0));
}
}
return is;
}
} // namespace std
//! itpp namespace
namespace itpp {
//! Constant Pi
const double pi = 3.14159265358979323846;
//! Constant 2*Pi
const double m_2pi = 2 * pi;
//! Constant eps
const double eps = std::numeric_limits<double>::epsilon();
//! \addtogroup miscfunc
//!@{
//! Return true if x is an integer
inline bool is_int(double x)
{
double dummy;
return (modf(x, &dummy) == 0.0);
}
//! Return true if x is an even integer
inline bool is_even(int x) { return ((x&1) == 0); }
//! Returns IT++ library version number, e.g. "3.7.1".
std::string itpp_version();
//! Returns machine endianness: big-endian = true; little-endian = false
bool check_big_endianness();
//!@}
} //namespace itpp
#endif // #ifndef MISC_H
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