math/complex.h

   1 /* Copyright (C) 1997-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      ISO C99:  7.3 Complex arithmetic        <complex.h>
  20  */
  21
  22 #ifndef _COMPLEX_H
  23 #define _COMPLEX_H      1
  24
  25 #include <features.h>
  26
  27 /* Get general and ISO C99 specific information.  */
  28 #include <bits/mathdef.h>
  29
  30 __BEGIN_DECLS
  31
  32 /* We might need to add support for more compilers here.  But since ISO
  33    C99 is out hopefully all maintained compilers will soon provide the data
  34    types `float complex' and `double complex'.  */
  35 #if __GNUC_PREREQ (2, 7) && !__GNUC_PREREQ (2, 97)
  36 # define _Complex __complex__
  37 #endif
  38
  39 #define complex         _Complex
  40
  41 /* Narrowest imaginary unit.  This depends on the floating-point
  42    evaluation method.
  43    XXX This probably has to go into a gcc related file.  */
  44 #define _Complex_I      (__extension__ 1.0iF)
  45
  46 /* Another more descriptive name is `I'.
  47    XXX Once we have the imaginary support switch this to _Imaginary_I.  */
  48 #undef I
  49 #define I _Complex_I
  50
  51 #if defined __USE_ISOC11 && __GNUC_PREREQ (4, 7)
  52 /* Macros to expand into expression of specified complex type.  */
  53 # define CMPLX(x, y) __builtin_complex ((double) (x), (double) (y))
  54 # define CMPLXF(x, y) __builtin_complex ((float) (x), (float) (y))
  55 # define CMPLXL(x, y) __builtin_complex ((long double) (x), (long double) (y))
  56 #endif
  57
  58 /* The file <bits/cmathcalls.h> contains the prototypes for all the
  59    actual math functions.  These macros are used for those prototypes,
  60    so we can easily declare each function as both `name' and `__name',
  61    and can declare the float versions `namef' and `__namef'.  */
  62
  63 #define __MATHCALL(function, args)      \
  64   __MATHDECL (_Mdouble_complex_,function, args)
  65 #define __MATHDECL(type, function, args) \
  66   __MATHDECL_1(type, function, args); \
  67   __MATHDECL_1(type, __CONCAT(__,function), args)
  68 #define __MATHDECL_1(type, function, args) \
  69   extern type __MATH_PRECNAME(function) args __THROW
  70
  71 #define _Mdouble_               double
  72 #define __MATH_PRECNAME(name)   name
  73 #include <bits/cmathcalls.h>
  74 #undef  _Mdouble_
  75 #undef  __MATH_PRECNAME
  76
  77 /* Now the float versions.  */
  78 #ifndef _Mfloat_
  79 # define _Mfloat_               float
  80 #endif
  81 #define _Mdouble_               _Mfloat_
  82 #define __MATH_PRECNAME(name)   name##f
  83 #include <bits/cmathcalls.h>
  84 #undef  _Mdouble_
  85 #undef  __MATH_PRECNAME
  86
  87 /* And the long double versions.  It is non-critical to define them
  88    here unconditionally since `long double' is required in ISO C99.  */
  89 #if !(defined __NO_LONG_DOUBLE_MATH && defined _LIBC)   \
  90     || defined __LDBL_COMPAT
  91 # ifdef __LDBL_COMPAT
  92 #  undef __MATHDECL_1
  93 #  define __MATHDECL_1(type, function, args) \
  94   extern type __REDIRECT_NTH(__MATH_PRECNAME(function), args, function)
  95 # endif
  96
  97 # ifndef _Mlong_double_
  98 #  define _Mlong_double_        long double
  99 # endif
 100 # define _Mdouble_              _Mlong_double_
 101 # define __MATH_PRECNAME(name)  name##l
 102 # include <bits/cmathcalls.h>
 103 #endif
 104 #undef  _Mdouble_
 105 #undef  __MATH_PRECNAME
 106 #undef  __MATHDECL_1
 107 #undef  __MATHDECL
 108 #undef  __MATHCALL
 109
 110 __END_DECLS
 111
 112 #endif /* complex.h */