Defined in header <stdexcept>
class length_error;

Defines a type of object to be thrown as exception. It reports errors that are consequence of attempt to exceed implementation defined length limits for some object.

This exception is thrown by member functions of std::basic_string and std::vector::reserve.

cpp/error/exception cpp/error/logic errorstd-length error-inheritance.svg

Inheritance diagram.

Member functions

constructs the exception object
(public member function)


explicit length_error( const std::string& what_arg );
explicit length_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)

See also

changes the number of characters stored
(public member function of std::basic_string)

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