chsvexception\nested_exceptions.cpp

An example of using the Chusov::Exceptions::throw_with_nested function and the Chusov::Exceptions::rethrow_if_nested function.

#include <iostream>
#include "chsvexception.h"
 
void f3()
{
    Chusov::Exceptions::ChsvExceptionByPosixCode(ERANGE);
}
void f2()
{
    try
    {
        f3();
    }catch(Chusov::Exceptions::ExceptionWithGenericCode<Chusov::chsverror_t>& ex)
    {
        Chusov::Exceptions::throw_with_nested(std::system_error(ex.Code(), std::generic_category()));
    }
}
 
struct Obj
{
    void fo()
    {
        try
        {
            f2();
        }catch(...)
        {
            Chusov::Exceptions::throw_with_nested(Chusov::Exceptions::AccessDeniedException(L"<DESCRIPTION>: f2 failed"));
        }
    }
};
 
void f1()
{
    try
    {
        Obj x;
        x.fo();
    }catch (...)
    {
        Chusov::Exceptions::throw_with_nested(Chusov::Exceptions::InvalidParameterException());
    }
}
 
#include <codecvt>
#include <locale>
#include <string>
 
template <class E>
void PrintNestedExceptions(E&& e, unsigned level = 1)
{
    try
    {
        Chusov::Exceptions::rethrow_if_nested(std::forward<E>(e));
    }catch (Chusov::Exceptions::Exception& ex)
    {
        std::wcout << std::wstring(level, L' ') << ex.What() << std::endl;
        PrintNestedExceptions(ex, ++level);
    }catch(std::exception& ex)
    {
        std::wcout << std::wstring(level, L' ') << std::wstring_convert<std::codecvt_utf8<wchar_t>>().from_bytes(ex.what()) << std::endl;
        PrintNestedExceptions(ex, ++level);
    }
}
 
int wmain(int argc, wchar_t **argv)
{
    try
    {
        f1();
    }catch (Chusov::Exceptions::Exception& ex)
    {
        std::wcout << L"Exception caught: " << ex.What() << std::endl;
        std::wcout << L"Nested exceptions (from top to bottom):\n";
        PrintNestedExceptions(ex);
    }
    return 0;
}
 
/*
Output:
Exception caught: Invalid parameter
Nested exceptions (from top to bottom):
 Access is denied: f2 failed
  unknown error
   Insufficient buffer
*/