qfloat.c

   1 /*
   2  * QFloat Module
   3  *
   4  * Copyright (C) 2009 Red Hat Inc.
   5  *
   6  * Authors:
   7  *  Luiz Capitulino <lcapitulino@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Copyright IBM, Corp. 2009
  13  *
  14  * Authors:
  15  *  Anthony Liguori   <aliguori@us.ibm.com>
  16  *
  17  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
  18  * See the COPYING.LIB file in the top-level directory.
  19  *
  20  */
  21
  22 #include "qfloat.h"
  23 #include "qobject.h"
  24 #include "qemu-common.h"
  25
  26 static void qfloat_destroy_obj(QObject *obj);
  27
  28 static const QType qfloat_type = {
  29     .code = QTYPE_QFLOAT,
  30     .destroy = qfloat_destroy_obj,
  31 };
  32
  33 /**
  34  * qfloat_from_int(): Create a new QFloat from a float
  35  *
  36  * Return strong reference.
  37  */
  38 QFloat *qfloat_from_double(double value)
  39 {
  40     QFloat *qf;
  41
  42     qf = qemu_malloc(sizeof(*qf));
  43     qf->value = value;
  44     QOBJECT_INIT(qf, &qfloat_type);
  45
  46     return qf;
  47 }
  48
  49 /**
  50  * qfloat_get_double(): Get the stored float
  51  */
  52 double qfloat_get_double(const QFloat *qf)
  53 {
  54     return qf->value;
  55 }
  56
  57 /**
  58  * qobject_to_qfloat(): Convert a QObject into a QFloat
  59  */
  60 QFloat *qobject_to_qfloat(const QObject *obj)
  61 {
  62     if (qobject_type(obj) != QTYPE_QFLOAT)
  63         return NULL;
  64
  65     return container_of(obj, QFloat, base);
  66 }
  67
  68 /**
  69  * qfloat_destroy_obj(): Free all memory allocated by a
  70  * QFloat object
  71  */
  72 static void qfloat_destroy_obj(QObject *obj)
  73 {
  74     assert(obj != NULL);
  75     qemu_free(qobject_to_qfloat(obj));
  76 }