/**************************************************************************
 *
 * rwexcept.cpp - Example program demonstrating the use of the optional
 *                C++ Standard Library exception mechanism.
 *
 * $Id: //stdlib/dev/examples/stdlib/manual/rwexcept.cpp#10 $
 *
 ***************************************************************************
 *
 * Copyright (c) 1994-2005 Quovadx,  Inc., acting through its  Rogue Wave
 * Software division. Licensed under the Apache License, Version 2.0 (the
 * "License");  you may  not use this file except  in compliance with the
 * License.    You    may   obtain   a   copy   of    the   License    at
 * http://www.apache.org/licenses/LICENSE-2.0.    Unless   required    by
 * applicable law  or agreed to  in writing,  software  distributed under
 * the License is distributed on an "AS IS" BASIS,  WITHOUT WARRANTIES OR
 * CONDITIONS OF  ANY KIND, either  express or implied.  See  the License
 * for the specific language governing permissions  and limitations under
 * the License.
 * 
 **************************************************************************/

#include <exception>      // for exception
#include <iostream>       // for cerr
#include <vector>         // for vector
#include <cstdlib>        // for exit()

#include <rw/_error.h>    // for __rw_throw_proc, _RWSTD_ERROR_BAD_CAST

#include <examples.h>


// function called from within the library to throw an exception
void exception_handler (int id, char *what)
{
    std::cerr << "exception #" <<  id << ": " << what << '\n';

    // 
    if (id >= _RWSTD_ERROR_BAD_CAST)
        delete[] what;

    // a real program would call abort() here to prevent the potentially
    // dangerous destruction of objects with static storage duration
    // abort ();

    // introduce exit into the current scope if it's declared in namespace
    // std (as it should be) to allow referring to the function without
    // qualification when <cstdlib> incorrectly declares it at file scope
    using namespace std;

    // successfully exit the process
    exit (0);

    // return at your own risk
}


// prevent the allocation of more than 4 elements
struct Allocator: std::allocator<int>
{
    size_type max_size () const {
        return 4;
    }
};


int main ()
{
    typedef std::vector<int, Allocator> Vector;

    Vector v;

    for (Vector::size_type n = 0; n != 2 * v.max_size (); ++n) {
        try {
            // try to reserve storage for `n' values
            v.reserve (n);
        }
        catch (std::exception &e) {
            std::cerr << "caught an exception:" << e.what () << '\n';

            // after the first exception has been caught
            // replace the default throw procedure used
            // by the library with a user-defined exception
            // function and continue to iterate
            __rw::__rw_throw_proc = exception_handler;
        }
    }

    // should not reach
    std::cerr << "unexpected return from main\n";

    return 1;
}