etc/config/src/EXTERN_C_EXCEPTIONS.cpp

// checking for exceptions from extern "C" functions

/***************************************************************************
 *
 * Licensed to the Apache Software  Foundation (ASF) under one or more
 * contributor  license agreements.  See  the NOTICE  file distributed
 * with  this  work  for  additional information  regarding  copyright
 * ownership.   The ASF  licenses this  file to  you 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.
 *
 * Copyright 1999-2007 Rogue Wave Software, Inc.
 * 
 **************************************************************************/

// test tries to determine whether it's possible to throw exceptions
// from functions with C language linkage

extern "C" {

int extern_c_function (int x, int y, int (*fun)(int, int))
{
    if (fun)
        return fun (x, y);

    return 0;

}

int div_throw (int x, int y)
{
    if (0 == y)
        throw y;

    return x / y;
}

int div_nothrow (int x, int y)
{
    if (0 == y)
        return 0;

    return x / y;

}

typedef int cfun_t (int, int);


}   // extern "C"


int main (int argc, char *argv[])
{
    const int x = argc < 2 ? 0 : int (*argv [1]);
    const int y = argc < 3 ? 0 : int (*argv [2]);

    cfun_t* pcfun = argc < 4 ? div_throw : div_nothrow;

    int result;

    try {
        result = extern_c_function (x, y, pcfun);
    }
    catch (int res) {
        result = res;
    }

    return result;
}