/usr/include/itpp/base/math/misc.h is in libitpp-dev 4.3.1-8.
This file is owned by root:root, with mode 0o644.
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* \file
* \brief Miscellaneous functions - header file
* \author Tony Ottosson, Adam Piatyszek and Conrad Sanderson
*
* -------------------------------------------------------------------------
*
* Copyright (C) 1995-2010 (see AUTHORS file for a list of contributors)
*
* This file is part of IT++ - a C++ library of mathematical, signal
* processing, speech processing, and communications classes and functions.
*
* IT++ 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 3 of the License, or (at your option) any
* later version.
*
* IT++ 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 IT++. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef MISC_H
#define MISC_H
#include <complex>
#include <string>
#include <limits>
#include <itpp/itexports.h>
namespace std
{
//! 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 = static_cast<char>(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".
ITPP_EXPORT std::string itpp_version();
//! Returns true if machine endianness is BIG_ENDIAN
ITPP_EXPORT bool is_bigendian();
//! This function is deprecated. Please use is_bigendian() instead.
inline bool check_big_endianness() { return is_bigendian(); }
//!@}
} //namespace itpp
#endif // #ifndef MISC_H
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