#include <functional>

int main() {

    std::function<int()> fn[];

    for( int i = ; i < ;i++ )

        fn[i] = [=]() {return i; };

    for( int i = ; i < ; i++ )

        printf( "%d\n", fn[i]() );

    return ;

}

//result:

//0~99

：

std::function<int()> fn[]

等于缩写了下面的：

typedef int (*TypeFn)();

TypeFn fn[];