std::underflow_error
| Defined in header  <stdexcept> | ||
| class underflow_error; | ||
Defines a type of object to be thrown as exception. It may be used to report arithmetic underflow errors (that is, situations where the result of a computation is a subnormal floating-point value)
The standard library components do not throw this exception (mathematical functions report underflow errors as specified in math_errhandling). Third-party libraries, however, use this. For example, boost.math throws std::underflow_error if boost::math::policies::throw_on_error is enabled (the default setting).
| Contents | 
[edit] Member functions
|  (constructor) | constructs the exception object (public member function) | 
std::underflow_error::underflow_error
| explicit underflow_error( const std::string& what_arg ); | (1) | |
| explicit underflow_error( const char* what_arg ); | (2) | (since C++11) | 
Constructs the exception object with what_arg as explanatory string that can be accessed through what().
Because copying std::exception is not permitted to throw exceptions, this message is typically stored internally as a separately-allocated reference-counted string. This is also why there is no constructor taking std::string&&: it would have to copy the content anyway.
Parameters
| what_arg | - | explanatory string | 
Exceptions
May throw std::bad_alloc
Inherited from std::exception
Member functions
| [virtual] | destructs the exception object (virtual public member function of std::exception) | 
| [virtual] | returns an explanatory string (virtual public member function of std::exception) | 



