EXTERN_C_EXCEPTIONS.cpp

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// checking for exceptions from extern "C" functions
 
 
// 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;
}