BadCastAllExcept, C++ (gcc)

BadCastAllExcept

//g++  7.4.0
//////////////////////////////////////////////////////////////////////////////
//BadCastAllExcept: understanding more  C++ exception and errors
//this code is created by Rezaul Hoque on June 21,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <typeinfo>
#include <exception>
#include <stdexcept>
void unexpected () { throw; }
void test() throw(std::bad_exception)
{
 throw std::runtime_error("exception test");
}
class A{
char c;
public:
A(){}
~A(){}
void func();
};
/***
class B{
int g;
public:
B(){}
~B(){}
};
***/
int main()
{
//std::bad_cast: failure to runtime check of dynamic cast because  types don't have inherent link [source: https://en.cppreference.com]
/***
  B f;
try{
A& a=dynamic_cast<A&>(f);
}catch(std::bad_cast& e)
{
std::cout<<e.what();
}
***/
//std::bad_alloc: failure to allocate storage[source: https://en.cppreference.com]
/***
try{
while (true){
int a=999999999;
int* c= new int[a];
 }
}catch (std::bad_alloc& e)
{
std::cout<<e.what();
}
***/
//bad_typeid:
/***
A* s=NULL;
try{
std::cout<<typeid(*s).name();
}catch(const std::bad_typeid& e)
{
std::cout<<e.what();
}
***/
//std::bad_exception: dynamic expected specification is violated and std::unexpected throws an exception that violates exception specification
[source: https://en.cppreference.com]
std::set_unexpected (unexpected);
try{
test();
}catch (const std::bad_exception & e)
{
std::cout<<e.what();
}

return 0;
}


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