volk_complex.h

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/* -*- c++ -*- */
/*
 * Copyright 2010, 2011, 2015, 2018, 2020, 2021 Free Software Foundation, Inc.
 *
 * This file is part of VOLK
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later
 */
 
#ifndef INCLUDED_VOLK_COMPLEX_H
#define INCLUDED_VOLK_COMPLEX_H
 
#ifdef __cplusplus
 
#include <stdint.h>
#include <complex>
 
typedef std::complex<int8_t> lv_8sc_t;
typedef std::complex<int16_t> lv_16sc_t;
typedef std::complex<int32_t> lv_32sc_t;
typedef std::complex<int64_t> lv_64sc_t;
typedef std::complex<float> lv_32fc_t;
typedef std::complex<double> lv_64fc_t;
 
template <typename T>
inline std::complex<T> lv_cmake(const T& r, const T& i)
{
    return std::complex<T>(r, i);
}
 
template <typename T>
inline typename T::value_type lv_creal(const T& x)
{
    return x.real();
}
 
template <typename T>
inline typename T::value_type lv_cimag(const T& x)
{
    return x.imag();
}
 
template <typename T>
inline T lv_conj(const T& x)
{
    return std::conj(x);
}
 
#else /* __cplusplus */
 
#include <complex.h>
#include <tgmath.h>
 
typedef char complex lv_8sc_t;
typedef short complex lv_16sc_t;
typedef long complex lv_32sc_t;
typedef long long complex lv_64sc_t;
typedef float complex lv_32fc_t;
typedef double complex lv_64fc_t;
 
#define lv_cmake(r, i) ((r) + _Complex_I * (i))
 
// When GNUC is available, use the complex extensions.
// The extensions always return the correct value type.
// http://gcc.gnu.org/onlinedocs/gcc/Complex.html
#ifdef __GNUC__
 
#define lv_creal(x) (__real__(x))
 
#define lv_cimag(x) (__imag__(x))
 
#define lv_conj(x) (~(x))
 
// When not available, use the c99 complex function family,
// which always returns double regardless of the input type,
// unless we have C99 and thus tgmath.h overriding functions
// with type-generic versions.
#else /* __GNUC__ */
 
#define lv_creal(x) (creal(x))
 
#define lv_cimag(x) (cimag(x))
 
#define lv_conj(x) (conj(x))
 
#endif /* __GNUC__ */
 
#endif /* __cplusplus */
 
#endif /* INCLUDE_VOLK_COMPLEX_H */