mirror of
https://github.com/yuzu-emu/unicorn.git
synced 2024-12-27 01:35:54 +00:00
f4b3c5d0bd
By moving the base fields to a QObjectBase_, QObject can be a type which also has a 'base' field. This allows writing a generic QOBJECT() macro that will work with any QObject type, including QObject itself. The container_of() macro ensures that the object to cast has a QObjectBase_ base field, giving some type safety guarantees. QObject must have no members but QObjectBase_ base, or else QOBJECT() breaks. QObjectBase_ is not a typedef and uses a trailing underscore to make it obvious it is not for normal use and to avoid potential abuse. Backports commit 3d3eacaeccaab718ea0e2ddaa578bfae9e311c59 from qemu
75 lines
2 KiB
C
75 lines
2 KiB
C
/*
|
|
* QNum Module
|
|
*
|
|
* Copyright (C) 2009 Red Hat Inc.
|
|
*
|
|
* Authors:
|
|
* Luiz Capitulino <lcapitulino@redhat.com>
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
* Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
|
|
* See the COPYING.LIB file in the top-level directory.
|
|
*/
|
|
|
|
#ifndef QNUM_H
|
|
#define QNUM_H
|
|
|
|
#include "qapi/qmp/qobject.h"
|
|
|
|
typedef enum {
|
|
QNUM_I64,
|
|
QNUM_U64,
|
|
QNUM_DOUBLE
|
|
} QNumKind;
|
|
|
|
/*
|
|
* QNum encapsulates how our dialect of JSON fills in the blanks left
|
|
* by the JSON specification (RFC 7159) regarding numbers.
|
|
*
|
|
* Conceptually, we treat number as an abstract type with three
|
|
* concrete subtypes: floating-point, signed integer, unsigned
|
|
* integer. QNum implements this as a discriminated union of double,
|
|
* int64_t, uint64_t.
|
|
*
|
|
* The JSON parser picks the subtype as follows. If the number has a
|
|
* decimal point or an exponent, it is floating-point. Else if it
|
|
* fits into int64_t, it's signed integer. Else if it fits into
|
|
* uint64_t, it's unsigned integer. Else it's floating-point.
|
|
*
|
|
* Any number can serve as double: qnum_get_double() converts under
|
|
* the hood.
|
|
*
|
|
* An integer can serve as signed / unsigned integer as long as it is
|
|
* in range: qnum_get_try_int() / qnum_get_try_uint() check range and
|
|
* convert under the hood.
|
|
*/
|
|
struct QNum {
|
|
struct QObjectBase_ base;
|
|
QNumKind kind;
|
|
union {
|
|
int64_t i64;
|
|
uint64_t u64;
|
|
double dbl;
|
|
} u;
|
|
};
|
|
|
|
QNum *qnum_from_int(int64_t value);
|
|
QNum *qnum_from_uint(uint64_t value);
|
|
QNum *qnum_from_double(double value);
|
|
|
|
bool qnum_get_try_int(const QNum *qn, int64_t *val);
|
|
int64_t qnum_get_int(const QNum *qn);
|
|
|
|
bool qnum_get_try_uint(const QNum *qn, uint64_t *val);
|
|
uint64_t qnum_get_uint(const QNum *qn);
|
|
|
|
double qnum_get_double(QNum *qn);
|
|
|
|
char *qnum_to_string(QNum *qn);
|
|
|
|
bool qnum_is_equal(const QObject *x, const QObject *y);
|
|
void qnum_destroy_obj(QObject *obj);
|
|
|
|
#endif /* QNUM_H */
|