Difference between revisions of "cpp/utility/functional/bad function call"
From cppreference.com
< cpp | utility | functional
m (format) |
Andreas Krug (Talk | contribs) m (fmt) |
||
| (3 intermediate revisions by 2 users not shown) | |||
| Line 2: | Line 2: | ||
{{cpp/utility/functional/navbar}} | {{cpp/utility/functional/navbar}} | ||
{{dcl begin}} | {{dcl begin}} | ||
| − | {{dcl header | functional}} | + | {{dcl header|functional}} |
| − | {{dcl | since=c++11 | 1= | + | {{dcl|since=c++11|1= |
class bad_function_call; | class bad_function_call; | ||
}} | }} | ||
{{dcl end}} | {{dcl end}} | ||
| − | {{tt|std::bad_function_call}} is the type of the exception thrown by | + | {{tt|std::bad_function_call}} is the type of the exception thrown by {{ltt|cpp/utility/functional/function/operator()|std::function::operator()}} if the function wrapper has no target. |
{{inheritance diagram/std-bad_function_call}} | {{inheritance diagram/std-bad_function_call}} | ||
| + | |||
===Member functions=== | ===Member functions=== | ||
| − | {{ | + | {{cpp/error/exception/member of derived|bad_function_call|std=c++11}} |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | }} | + | |
{{cpp/error/exception/inherit}} | {{cpp/error/exception/inherit}} | ||
| Line 32: | Line 19: | ||
===Example=== | ===Example=== | ||
{{example | {{example | ||
| − | + | |code= | |
| − | + | #include <functional> | |
#include <iostream> | #include <iostream> | ||
| − | |||
int main() | int main() | ||
{ | { | ||
std::function<int()> f = nullptr; | std::function<int()> f = nullptr; | ||
| − | try { | + | try |
| + | { | ||
f(); | f(); | ||
| − | } catch(const std::bad_function_call& e) { | + | } |
| + | catch (const std::bad_function_call& e) | ||
| + | { | ||
std::cout << e.what() << '\n'; | std::cout << e.what() << '\n'; | ||
} | } | ||
} | } | ||
|p=true | |p=true | ||
| − | + | |output= | |
bad function call | bad function call | ||
}} | }} | ||
| Line 53: | Line 42: | ||
===See also=== | ===See also=== | ||
{{dsc begin}} | {{dsc begin}} | ||
| − | {{dsc inc | cpp/utility/functional/dsc function}} | + | {{dsc inc|cpp/utility/functional/dsc function}} |
{{dsc end}} | {{dsc end}} | ||
| − | + | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
Latest revision as of 08:09, 12 October 2023
| Defined in header <functional>
|
||
| class bad_function_call; |
(since C++11) | |
std::bad_function_call is the type of the exception thrown by std::function::operator() if the function wrapper has no target.
Inheritance diagram
Contents |
[edit] Member functions
| (constructor) |
constructs a new bad_function_call object (public member function) |
| operator= |
replaces the bad_function_call object (public member function) |
| what |
returns the explanatory string (public member function) |
std::bad_function_call::bad_function_call
| bad_function_call() noexcept; |
(1) | (since C++11) |
| bad_function_call( const bad_function_call& other ) noexcept; |
(2) | (since C++11) |
Constructs a new bad_function_call object with an implementation-defined null-terminated byte string which is accessible through what().
1) Default constructor.
2) Copy constructor. If *this and other both have dynamic type
std::bad_function_call then std::strcmp(what(), other.what()) == 0.Parameters
| other | - | another exception object to copy |
std::bad_function_call::operator=
| bad_function_call& operator=( const bad_function_call& other ) noexcept; |
(since C++11) | |
Assigns the contents with those of other. If *this and other both have dynamic type std::bad_function_call then std::strcmp(what(), other.what()) == 0 after assignment.
Parameters
| other | - | another exception object to assign with |
Return value
*this
std::bad_function_call::what
| 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
| [virtual] |
destroys the exception object (virtual public member function of std::exception)
|
| [virtual] |
returns an explanatory string (virtual public member function of std::exception)
|
[edit] Example
Run this code
#include <functional> #include <iostream> int main() { std::function<int()> f = nullptr; try { f(); } catch (const std::bad_function_call& e) { std::cout << e.what() << '\n'; } }
Possible output:
bad function call
[edit] See also
| (C++11) |
copyable wrapper of any copy constructible callable object (class template) |
