Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the develop branch, built from commit c5994560ca.

Class bad_virtual_result_cast

boost::contract::bad_virtual_result_cast — Exception thrown when inconsistent return values are passed to overridden virtual public functions.


// In header: <boost/contract/core/exception.hpp>

class bad_virtual_result_cast :
  public std::bad_cast, public boost::contract::exception
  // construct/copy/destruct
  explicit bad_virtual_result_cast(char const *, char const *);

  // public member functions
  virtual char const  * what() const;


This exception is thrown when programmers pass to this library return value parameters for public function overrides in derived classes that are not consistent with the return type parameter passed for the virtual public function being overridden from the base classes. This allows this library to give more descriptive error messages in such cases of misuse.

This exception is internally thrown by this library and programmers should not need to throw it from user code.

See Also:

Public Function Overrides

bad_virtual_result_cast public construct/copy/destruct

  1. explicit bad_virtual_result_cast(char const * from_type_name, 
                                     char const * to_type_name);
    Construct this object with the name of the from- and to- result types.



    Name of the from-type (source of the cast).


    Name of the to-type (destination of the cast).

  2. ~bad_virtual_result_cast();
    Destruct this object.

    Throws: This is declared noexcept (or throw() before C++11).

bad_virtual_result_cast public member functions

  1. virtual char const  * what() const;
    Description for this error (containing both from- and to- type names).

    Throws: This is declared noexcept (or throw() before C++11).