std::invalid_argument
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.
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) |
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)
Parameters
| what_arg | - | explanatory string |
| other | - | another exception object to copy |
Exceptions
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) |
|
[virtual]
|
returns an explanatory string (virtual public member function of std::exception) |
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.
Example
#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
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/error/invalid_argument
