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Showing content from https://en.cppreference.com/w/cpp/language/../keyword/../header/exception.html below:

Standard library header <exception> - cppreference.com

This header is part of the error handling library.

// all freestanding
namespace std {
  class exception;
  class bad_exception;
  class nested_exception;
 
  using terminate_handler = void (*)();
  terminate_handler get_terminate() noexcept;
  terminate_handler set_terminate(terminate_handler f) noexcept;
  [[noreturn]] void terminate() noexcept;
 
  constexpr int uncaught_exceptions() noexcept;
 
  using exception_ptr = /* unspecified */;
 
  constexpr exception_ptr current_exception() noexcept;
  [[noreturn]] constexpr void rethrow_exception(exception_ptr p);
  template<class E> constexpr exception_ptr make_exception_ptr(E e) noexcept;
 
  template<class T> [[noreturn]] constexpr void throw_with_nested(T&& t);
  template<class E> constexpr void rethrow_if_nested(const E& e);
}

namespace std {
  class exception
  {
  public:
    constexpr exception() noexcept;
    constexpr exception(const exception&) noexcept;
    constexpr exception& operator=(const exception&) noexcept;
    constexpr virtual ~exception();
    constexpr virtual const char* what() const noexcept;
  };
}

namespace std {
  class bad_exception : public exception
  {
  public:
    // see description for the specification of the special member functions
    constexpr const char* what() const noexcept override;
  };
}

namespace std {
  class nested_exception
  {
  public:
    constexpr nested_exception() noexcept;
    constexpr nested_exception(const nested_exception&) noexcept = default;
    constexpr nested_exception& operator=(const nested_exception&) noexcept = default;
    constexpr virtual ~nested_exception() = default;
 
    // access functions
    [[noreturn]] constexpr void rethrow_nested() const;
    constexpr exception_ptr nested_ptr() const noexcept;
  };
 
  template<class T> [[noreturn]] constexpr void throw_with_nested(T&& t);
  template<class E> constexpr void rethrow_if_nested(const E& e);
}

• Error handling

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