Re: Order of destructor execution.

"Victor Bazarov" <>
Tue, 24 Jul 2007 15:08:47 -0400
__PPS__ wrote:

I think you made a mistake thinking that MutexLocker ( mut ); is the
same as MutexLocker mut;

It is, if 'MutexLocker' is a type. I actually made a mistake of
thinking it would be a creation of a temporary object (that's all
*if* 'MutexLocker' is a type), but it isn't. Here is the test you
can run

    class MutexLocker {
        MutexLocker() {} // default c-tor
        MutexLocker(int) {} // parameterized c-tor
        operator int() const { return 42; }

    int mut = 0;

    int main() {
        return mut;

What do you think this program's "main" will return to the system?
Please explain.

Another example, similar, of ill-formed code:

    class MutexLocker {
        MutexLocker() {} // default c-tor -- private!!!
        MutexLocker(int) {} // parameterized c-tor

    int mut = 0;

    int main() {
        MutexLocker(mut); // should not compile

Now, if 'MutexLocker' is NOT a type but instead, say, a macro that
expands into something like

    MutexLocker_t someUniqueVariableName123456(mut);

then further clarification may be required.


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