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Showing content from https://cplusplus.com/reference/exception/exception/exception/ below:

public member function

<exception>

exception() throw();

exception (const exception& e) throw();

exception() noexcept;

exception (const exception& e) noexcept;

Construct exception

The effects of calling member

after a copy construction depend on the particular library implementation.

Every exception within the C++ standard library (including this) has, at least, a copy constructor that preserves the string representation returned by member

when the dynamic types match.

e

Another exception object.

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// exception constructor
#include <iostream>       // std::cout
#include <exception>      // std::exception

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

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

exception::operator=

Copy exception (public member function)

exception::what

Get string identifying exception (public member function)

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