Re: new(nothrow not even from constructor)

From:

Ruslan Mullakhmetov <tiabaldu@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Wed, 22 Dec 2010 02:14:05 +0300

Message-ID:

<iercbt$t2j$1@speranza.aioe.org>

On 12/22/2010 12:10 AM, red floyd wrote:

On Dec 20, 11:30 pm, Ruslan Mullakhmetov<tiaba...@gmail.com> wrote:

On 12/21/2010 5:22 AM, red floyd wrote:

On 12/20/2010 11:47 AM, Ruslan Mullakhmetov wrote:

you could probably use operator new overloading, but i'm not sure. never
overloaded one.

Or you could do this:

template<typename T>
T* new_thread(Func_type f, int state)
{
T* ret = NULL;
try {
ret = new Thread(f, state);
}
catch (...) {
// do something, or not
}

return ret;

}

Or I think it makes sense to get new_thread as static function-member of
Thread class say Thread::create. I'd prefer this, cause it number of
reduces global scoped free functions.

Yeah, I kind of switched gears mid-stream -- I started with a generic
template to deal with any type of create and then halfway through
switched to "Thread" specific -- mainly because I couldn't remember
the syntax for variadic templates.

My intent was to provide a generic "new" for OP that catches all
exceptions, including those thrown by the constructor.

I'm sorry, didn't take into account that it was templatized. I think,
there is no need for variadic templates to make it general new. SFINAE
allow, if i'm not mistaken to make variable number of parameters passed
to constructor through this generalized exception-free new.

template<typename T>
T* my_new()
{
    T* ret = NULL;
    try {
        ret = new T;
    }
    catch (...) {
        // do something, or not
    }

    return ret;
}

template<typename T, typename P1>
T* my_new(P1 p1)
{
    T* ret = NULL;
    try {
        ret = new T(p1);
    }
    catch (...) {
        // do something, or not
    }

    return ret;
}

template<typename T, typename P1, typename P2>
T* my_new(P1 p1, P2 p2)
{
    T* ret = NULL;
    try {
        ret = new T(p1, p2);
    }
    catch (...) {
        // do something, or not
    }

    return ret;
}

//...