new(nothrow not even from constructor)

Virchanza <>
Sun, 19 Dec 2010 03:55:48 -0800 (PST)
    I've been looking through the Dinkumware reference manual and I
can't find a form of "new" that doesn't throw any exceptions at all.

    I'm currently writing a program that uses the "new" operator to do
stuff like create thread objects and window objects. If a thread
object or window object can't be created, my program displays a
message box, something like "Creation of the Help dialog box failed".
Ideally it would be:

    Thread *const p = new(std::nothrow) Thread(my_entry_function,

    if (!p)
        wxMessageBox("Can't create thread");

The problem with this however, is that don't want any exceptions at
all to be thrown by the "new" operator. For instance, the following
"Hello World" program doesn't work:

#include <new>
#include <iostream>

class MyClass {

        throw 5;

int main()
    MyClass *p = new(std::nothrow) MyClass();

    std::cout << "Hello World!\n";

The "nothrow" only stops "new" from throwing a "bad_alloc" if the
memory allocation fails -- it doesn't suppress exceptions thrown from
the constructor of the object. (Or at least that's the GNU C++

Is the following my only option?

int main()
    MyClass *p;

    try { p = new MyClass(); } catch(...) { p = 0; }

    std::cout << "Hello World!\n";

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