小编Sit*_*myu的帖子

TestCase2并且TestCase3可以正常编译。但是，TestCase1我收到以下错误：

E0312, Custom conversion from "lambda []void ()->void" to
       "EventHandler" is not appropriate.

为什么我会收到此错误？我想知道如何解决。

#include <functional>
#include <iostream>

class EventHandler
{
    std::function<void()> _func;

public:
    int id;
    static int counter;

    EventHandler() : id{ 0 } {}
    EventHandler(const std::function<void()>& func) : _func{ func }
    {
        id = ++EventHandler::counter;
    }
};

int EventHandler::counter = 0;

int main()
{
    EventHandler TestCase1 = []() {};
    EventHandler TestCase2([]() {});
    EventHandler TestCase3 = static_cast<std::function<void()>>([]() {});
}