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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_exception_constructor.htm below:

C++ Exception Constructor

It is constructor exception.

Following is the declaration for std::exception::exception.

	
exception() throw();
exception (const exception& e) throw();

	
exception() noexcept;
exception (const exception& e) noexcept;

e − It is an another exception object.

none

No-throw guarantee − no members throw exceptions.

In below example for std::exception::exception.

#include <iostream>       
#include <exception>      

struct ooops : std::exception {
   const char* what() const noexcept {return "Exception test!\n";}
};

int main () {
   ooops e;
   std::exception* p = &e;
   try {
      throw e;       
   } catch (std::exception& ex) {
      std::cout << ex.what();
   }
   try {
      throw *p;      
   } catch (std::exception& ex) {
      std::cout << ex.what();
   }
   return 0;
}

The sample output should be like this −

Exception test!
std::exception 

exception.htm

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