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std::invalid_argument

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Defined in header <stdexcept>
class invalid_argument;

Defines a type of object to be thrown as exception. It reports errors that arise because an argument value has not been accepted.

This exception is thrown by std::bitset::bitset, and the std::stoi and std::stof families of functions.

cpp/error/exceptioncpp/error/logic errorstd-invalid argument-inheritance.svg
About this image

Inheritance diagram

Contents

[edit] Member functions

(constructor)
constructs a new invalid_argument object with the given message
(public member function)
operator=
replaces the invalid_argument object
(public member function)
what
returns the explanatory string
(public member function)

std::invalid_argument::invalid_argument

invalid_argument( const std::string& what_arg );
(1)
invalid_argument( const char* what_arg );
(2) (since C++11)
(3)
invalid_argument( const invalid_argument& other );
(until C++11)
invalid_argument( const invalid_argument& other ) noexcept;
(since C++11)
1-2) Constructs the exception object with what_arg as explanatory string that can be accessed through what().
3) Copy constructor. If *this and other both have dynamic type std::invalid_argument then std::strcmp(what(), other.what()) == 0. (since C++11)

Parameters

what_arg - explanatory string
other - another exception object to copy

Exceptions

1-2) May throw std::bad_alloc

Notes

Because copying std::invalid_argument 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::invalid_argument::operator=

invalid_argument& operator=( const invalid_argument& other );
(until C++11)
invalid_argument& operator=( const invalid_argument& other ) noexcept;
(since C++11)

Assigns the contents with those of other. If *this and other both have dynamic type std::invalid_argument then std::strcmp(what(), other.what()) == 0 after assignment. (since C++11)

Parameters

other - another exception object to assign with

Return value

*this

std::invalid_argument::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::logic_error

Inherited from std::exception

Member functions

[virtual]
destroys the exception object
(virtual public member function of std::exception) [edit]
[virtual]
returns an explanatory string
(virtual public member function of std::exception) [edit]

[edit] Notes

The purpose of this exception type is similar to the error condition std::errc::invalid_argument (thrown in std::system_error from member functions of std::thread) and the related errno constant EINVAL.