/*! \file
Copyright (c) 2003, The Regents of the University of California, through
Lawrence Berkeley National Laboratory (subject to receipt of any required 
approvals from U.S. Dept. of Energy) 

All rights reserved. 

The source code is distributed under BSD license, see the file License.txt
at the top-level directory.
*/

/*! @file slu_scomplex.h
 * \brief Header file for complex operations
 * <pre> 
 *  -- SuperLU routine (version 2.0) --
 * Univ. of California Berkeley, Xerox Palo Alto Research Center,
 * and Lawrence Berkeley National Lab.
 * November 15, 1997
 *
 * Contains definitions for various complex operations.
 * This header file is to be included in source files c*.c
 * </pre>
 */
#ifndef __SUPERLU_SCOMPLEX /* allow multiple inclusions */
#define __SUPERLU_SCOMPLEX


#ifndef SCOMPLEX_INCLUDE
#define SCOMPLEX_INCLUDE

typedef struct { float r, i; } complex;


/* Macro definitions */

/*! \brief Complex Addition c = a + b */
#define c_add(c, a, b) { (c)->r = (a)->r + (b)->r; \
			 (c)->i = (a)->i + (b)->i; }

/*! \brief Complex Subtraction c = a - b */
#define c_sub(c, a, b) { (c)->r = (a)->r - (b)->r; \
			 (c)->i = (a)->i - (b)->i; }

/*! \brief Complex-Double Multiplication */
#define cs_mult(c, a, b) { (c)->r = (a)->r * (b); \
                           (c)->i = (a)->i * (b); }

/*! \brief Complex-Complex Multiplication */
#define cc_mult(c, a, b) { \
	float cr, ci; \
    	cr = (a)->r * (b)->r - (a)->i * (b)->i; \
    	ci = (a)->i * (b)->r + (a)->r * (b)->i; \
    	(c)->r = cr; \
    	(c)->i = ci; \
    }

#define cc_conj(a, b) { \
        (a)->r = (b)->r; \
        (a)->i = -((b)->i); \
    }

/*! \brief Complex equality testing */
#define c_eq(a, b)  ( (a)->r == (b)->r && (a)->i == (b)->i )


#ifdef __cplusplus
extern "C" {
#endif

/* Prototypes for functions in scomplex.c */
void c_div(complex *, complex *, complex *);
double c_abs(complex *);     /* exact */
double c_abs1(complex *);    /* approximate */
void c_exp(complex *, complex *);
void r_cnjg(complex *, complex *);
double r_imag(complex *);
complex c_sgn(complex *);
complex c_sqrt(complex *);



#ifdef __cplusplus
  }
#endif

#endif

#endif  /* __SUPERLU_SCOMPLEX */
