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.
Inheritance diagram.
(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) |
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) |
what_arg
as explanatory string that can be accessed through what()
.*this
and other
both have dynamic type std::invalid_argument
then std::strcmp(what(), other.what()) == 0
. (since C++11)
what_arg | - | explanatory string |
other | - | another exception object to copy |
std::bad_alloc
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.
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).
other | - | another exception object to assign with |
*this
.
virtual const char* what() const throw(); | (until C++11) | |
virtual const char* what() const noexcept; | (since C++11) |
Returns the explanatory string.
(none).
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.
Implementations are allowed but not required to override what()
.
[virtual] | destroys the exception object (virtual public member function of std::exception ) |
[virtual] | returns an explanatory string (virtual public member function of std::exception ) |
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
.
#include <bitset> #include <iostream> #include <stdexcept> #include <string> int main() { try { std::bitset<4>{"012"}; // Throws: only '0' or '1' expected } catch (std::invalid_argument const& ex) { std::cout << "#1: " << ex.what() << '\n'; } try { [[maybe_unused]] int f = std::stoi("ABBA"); // Throws: no conversion } catch (std::invalid_argument const& ex) { std::cout << "#2: " << ex.what() << '\n'; } try { [[maybe_unused]] float f = std::stof("(3.14)"); // Throws: no conversion } catch (std::invalid_argument const& ex) { std::cout << "#3: " << ex.what() << '\n'; } }
Possible output:
#1: bitset string ctor has invalid argument #2: stoi: no conversion #3: stof: no conversion
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