qdbusdemarshaller.cpp File Reference

#include "qdbusargument_p.h"
#include "qdbusconnection.h"
#include <stdlib.h>

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Functions
template<typename T >
static T	qIterGet (DBusMessageIter *it)

Function Documentation

qIterGet()

template<typename T >

static T qIterGet ( DBusMessageIter *  it )

inlinestatic

Definition at line 49 of file qdbusdemarshaller.cpp.

{
    // Use a union of expected and largest type q_dbus_message_iter_get_basic
    // will return to ensure reading the wrong basic type does not result in
    // stack overwrite
    union {
        // The value to be extracted
        T t;
        // Largest type that q_dbus_message_iter_get_basic will return
        // according to dbus_message_iter_get_basic API documentation
        dbus_uint64_t maxValue;
        // A pointer to ensure no stack overwrite in case there is a platform
        // where sizeof(void*) > sizeof(dbus_uint64_t)
        void* ptr;
    } value;

    // Initialize the value in case a narrower type is extracted to it.
    // Note that the result of extracting a narrower type in place of a wider
    // one and vice-versa will be platform-dependent.
    value.t = T();

    q_dbus_message_iter_get_basic(it, &value);
    q_dbus_message_iter_next(it);
    return value.t;
}