什么原因导致std :: bad_function_call？ [英] What causes std::bad_function_call?

问题描述

我看过很少 问题，引用 std :: bad_function_call exception < a>，但是无法通过Googling找到导致此异常的原因。

I've seen a few questions that refer to the std::bad_function_call exception, but haven't been able to find out any by Googling about what causes this exception.

什么样的行为应该导致此异常？

What kind of behavior is supposed to cause this exception? Can you give me minimal examples that don't have other semantic problems also going on?

推荐答案

当然，最简单的例子是：尝试调用 std :: function 为空。

Sure- the easiest is where you try to call a std::function that's empty.

int main() {
    std::function<int()> intfunc;
    int x = intfunc(); // BAD
}

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