qobject/qfloat.c

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