examples/tutorial/exceptn.cpp

/**************************************************************************
 *
 * exceptn.cpp - Illustrate the use of Standard exceptions.
 *
 * $Id: //stdlib/dev/examples/stdlib/tutorial/exceptn.cpp#11 $
 *
 ***************************************************************************
 *
 * 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 <string>      // for string
#include <stdexcept>   // for exception, runtime_error, out_of_range
#include <iostream>    // for cout

#include <examples.h>


#ifndef _RWSTD_NO_EXCEPTIONS

int main () {
    
    // First we'll incite and catch an exception from the C++ Standard
    // library class std::string by attempting to replace a substring
    // starting at a position beyond the end of the string object.
    try {
        std::string ().replace (100, 1, 1, 'c');
    }
    catch (std::out_of_range &e) {

        // Print out the exception string, which in this implementation
        // includes the location and the name of the function that threw
        // the exception along with the reason for the exception.
        std::cout << "Caught an out_of_range exception: "
                  << e.what () << '\n';
    }
    catch (std::exception &e) {

        std::cout << "Caught an exception of an unexpected type: "
                  << e.what () << '\n';
    }
    catch (...) {
        std::cout << "Caught an unknown exception\n";
    }
    
    // Throw another exception.
    try {
        throw std::runtime_error ("a runtime error");
    }
    catch (std::runtime_error &e) {
        std::cout << "Caught a runtime_error exception: "
                  << e.what () << '\n';
    }
    catch (std::exception &e) {
        std::cout << "Caught an exception of an unexpected type: "
                  << e.what () << '\n';
    } 
    catch (...) {
        std::cout << "Caught an unknown exception\n";
    }
   
    return 0;
}

#else   // if defined (_RWSTD_NO_EXCEPTIONS)

int main () {
    
    std::cout << "Exception support disabled.\n";

    return 0;
}

#endif   // _RWSTD_NO_EXCEPTIONS