#include <functional>
#include <iostream>
#include <memory>
void f(int n1, int n2, int n3, const int &n4, int n5) {
std::cout << n1 << ' ' << n2 << ' ' << n3 << ' ' << n4 << ' ' << n5 << '\n';
}
int g(int n1) { return n1; }
struct Foo {
void print_sum(int n1, int n2) { std::cout << n1 + n2 << '\n'; }
int data = 10;
};
int main() {
using namespace std::placeholders; // for _1, _2, _3...
// demonstrates argument reordering and pass-by-reference
int n = 7;
// (_1 and _2 are from std::placeholders, and represent future
// arguments that will be passed to f1)
auto f1 = std::bind(f, _2, _1, 42, std::cref(n), n);
n = 10;
f1(1, 2, 1001); // 1 is bound by _1, 2 is bound by _2, 1001 is unused
// makes a call to f(2, 1, 42, n, 7)
// nested bind subexpressions share the placeholders
auto f2 = std::bind(f, _3, std::bind(g, _3), _3, 4, 5);
f2(10, 11, 12); // makes a call to f(12, g(12), 12, 4, 5);
// bind to a pointer to member function
Foo foo;
auto f3 = std::bind(&Foo::print_sum, &foo, 95, _1);
f3(5);
// bind to a pointer to data member
auto f4 = std::bind(&Foo::data, _1);
std::cout << f4(foo) << '\n';
}
#include <iostream>
#include <vector>
#include <string>
#include <memory>
using namespace std;
class A
{
public:
void operator()()
{
cout << "lala" << endl;
}
};
int main()
{
A a;
auto f = bind( a );
f();
}
//输出lala
参考：https://blog.csdn.net/caoshangpa/article/details/79173351
