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std::bad_function_call

STD：不好[医]功能[医]打电话

Defined in header ​​
class bad_function_call;​(since C++11)

std::bad_function_call引发的异常的类型。std::function::operator()如果函数包装器没有目标。

二次

二次

继承图

成员函数

(constructor)bad_function_call() (public member function)

STD：不好[医]功能[医]呼叫：：坏[医]功能[医]拨打%28%29

bad_function_call(​​

构造一个新的实例。std::bad_function_call...

参数

%280%29

例外

noexcept规格：

noexcept

继承自STD：例外

成员函数

(destructor) virtualdestructs the exception object (virtual public member function of std::exception)
what virtualreturns an explanatory string (virtual public member function of std::exception)

例

二次

#include <iostream>
#include <functional>
 
int main()
{
    std::function<int()> f = nullptr;
    try {
        f(
    } catch(const std::bad_function_call& e) {
        std::cout << e.what() << '\n';
    }
}

二次

可能的产出：

二次

bad function call

二次

另见

function (C++11)wraps callable object of any type with specified function call signature (class template)

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