Defined in header <stdexcept>
class overflow_error;

Defines a type of object to be thrown as exception. It can be used to report arithmetic overflow errors (that is, situations where a result of a computation is too large for the destination type).

The only standard library components that throw this exception are std::bitset::to_ulong and std::bitset::to_ullong.

The mathematical functions of the standard library components do not throw this exception (mathematical functions report overflow errors as specified in math_errhandling). Third-party libraries, however, use this. For example, boost.math throws std::overflow_error if boost::math::policies::throw_on_error is enabled (the default setting).

cpp/error/exception cpp/error/runtime errorstd-overflow error-inheritance.svg

Inheritance diagram.

Member functions

constructs the exception object
(public member function)


explicit overflow_error( const std::string& what_arg );
explicit overflow_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.


what_arg - explanatory string


May throw std::bad_alloc.

Inherited from std::exception

Member functions

destructs the exception object
(virtual public member function of std::exception)
returns an explanatory string
(virtual public member function of std::exception)

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