C++(一)function

#include 

typedef void (*func)(void);

void func1(void)
{
    std::cout << "hello func1" << std::endl;
}

void func2(void)
{
    std::cout << "hello func2" << std::endl;
}

int main(int argc, char *argv[])
{
    func fc = func1;
    fc();

    fc = func2;
    fc();

    return 0;
}

#include 
#include 

void func1(void)
{
    std::cout << "hello func1" << std::endl;
}

void func2(void)
{
    std::cout << "hello func2" << std::endl;
}

int main(int argc, char *argv[])
{
    std::function func(&func1);
    func();

    func = &func2;
    func();

    return 0;
}