std::bad_function_call
Defined in header <functional> |
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(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
Member functions
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(constructor)
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constructs a new bad_function_call object (public member function) |
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operator=
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replaces the bad_function_call object (public member function) |
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what
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returns the explanatory string (public member function) |
std::bad_function_call::bad_function_call
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(1) | (since C++11) |
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(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=
|
(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
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(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) |
Example
#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 callSee also
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(C++11)
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wraps callable object of any copy constructible type with specified function call signature (class template) |
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