STD_UNCAUGHT_EXCEPTION.cpp

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// checking for std::uncaught_exception()
 
 
#include "config.h"
 
 
#ifndef _RWSTD_NO_HONOR_STD
#  ifdef _RWSTD_NO_STD_TERMINATE
#    include "terminate.h"
#  endif   // _RWSTD_NO_STD_TERMINATE
#endif   // _RWSTD_NO_HONOR_STD
 
 
// will fail if namespaces aren't supported
namespace std {
 
// looking for a definition in compiler support library
bool uncaught_exception ();
 
}
 
// will cause an error if namespace std isn't being honored
bool (*uncaught_exception)();
 
bool foo () { return false; }
 
bool uncaught;
 
struct S {
    ~S () {
        uncaught = (*uncaught_exception)();
    }
};
 
 
int main (int argc, char *argv[])
{
    (void)&argv;
 
    int result = 0;
 
    if (argc > 1)
        uncaught_exception = &std::uncaught_exception;
    else
        uncaught_exception = foo;
 
    if ((*uncaught_exception)())
        result = result << 1 + 1;
 
#ifndef _RWSTD_NO_EXCEPTIONS
 
    try {
        S s;
 
        // do not actually invoke uncaught_exception()
        // unless at least one command-line argument
        // is specified (done to prevent the compiler
        // from optimizing the function call away)
        if (argc > 1)
            throw 0;
    }
    catch (...) {
    }
 
#endif   // _RWSTD_NO_EXCEPTIONS
 
    if (uncaught)
        result = result << 1 + 1;
 
    return result;
}