std::logic_error
Defined in header <stdexcept> |
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class logic_error; |
Defines a type of object to be thrown as exception. It reports errors that are a consequence of faulty logic within the program such as violating logical preconditions or class invariants and may be preventable.
No standard library components throw this exception directly, but the exception types std::invalid_argument, std::domain_error, std::length_error, std::out_of_range, std::future_error, and std::experimental::bad_optional_access are derived from std::logic_error.
Inheritance diagram.
Member functions
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(constructor)
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constructs a new logic_error object with the given message (public member function) |
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operator=
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replaces the logic_error object (public member function) |
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what
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returns the explanatory string (public member function) |
std::logic_error::logic_error
logic_error( const std::string& what_arg ); |
(1) | |
logic_error( const char* what_arg ); |
(2) | (since C++11) |
| (3) | ||
logic_error( const logic_error& other ); |
(until C++11) | |
logic_error( const logic_error& other ) noexcept; |
(since C++11) |
what_arg as explanatory string that can be accessed through
what().
*this and other both have dynamic type std::logic_error then std::strcmp(what(), other.what()) == 0. (since C++11)
Parameters
| what_arg | - | explanatory string |
| other | - | another exception object to copy |
Exceptions
std::bad_alloc
Notes
Because copying std::logic_error 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.
std::logic_error::operator=
logic_error& operator=( const logic_error& other ); |
(until C++11) | |
logic_error& operator=( const logic_error& other ) noexcept; |
(since C++11) |
Assigns the contents with those of other. If *this and other both have dynamic type std::logic_error then std::strcmp(what(), other.what()) == 0 after assignment. (since C++11).
Parameters
| other | - | another exception object to assign with |
Return value
*this.
std::logic_error::what
virtual const char* what() const throw(); |
(until C++11) | |
virtual const char* what() const noexcept; |
(since C++11) |
Returns the explanatory string.
Parameters
(none).
Return value
Pointer to a null-terminated string with explanatory information. The string is suitable for conversion and display as a std::wstring. The pointer is guaranteed to be valid at least until the exception object from which it is obtained is destroyed, or until a non-const member function (e.g. copy assignment operator) on the exception object is called.
Notes
Implementations are allowed but not required to override what().
Inherited from std::exception
Member functions
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[virtual]
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destroys the exception object (virtual public member function of std::exception) |
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[virtual]
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returns an explanatory string (virtual public member function of std::exception) |
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