#include <iostream>

#include <functional>

#include <vector>

#include <memory>

#include <algorithm>

#define SHOW_TRAP_1 1

#define SHOW_TRAP_2 1

typedef std::function<void()> FP;

class Point

{

public:

Point(int x,int y):m_x(x),m_y(y)

{

}

void print()

{

#if 1

int x = m_x;

int y = m_y;

s_print_history.push_back([x,y](){std::cout << "(X:" << x << ",Y:" << y <<")" << std::endl;});

#else

s_print_history.push_back([=](){std::cout << "(X:" << m_x << ",Y:" << m_y <<")" << std::endl;});

#endif

std::cout << "(X:" << m_x << ",Y:" << m_y <<")" << std::endl;

}

static void print_history()

{

std::cout << "print history:"<<std::endl;

std::for_each(s_print_history.begin(),s_print_history.end(),[](FP p){

if(p)

p();

});

}

private:

int m_x;

int m_y;

typedef std::function<void(void)> FP;

static std::vector<FP> s_print_history;

};

std::vector<FP> Point::s_print_history = std::vector<FP>();

void run_fun_ptr(FP fp);

FP get_fun_ptr();

FP get_fun_ptr_ref();

int main()

{

#if SHOW_TRAP_1

run_fun_ptr(get_fun_ptr());

run_fun_ptr(get_fun_ptr_ref());

#endif

#if SHOW_TRAP_2

std::unique_ptr<Point> p;

p.reset(new Point(1,1));p->print();

p.reset(new Point(2,2));p->print();

p.reset(new Point(3,3));p->print();

Point::print_history();

#endif

return 0;

}

void run_fun_ptr(FP fp)

{

if(fp)

{

fp();

}

}

FP get_fun_ptr()

{

int a = 2;

return [=](){std::cout << "= a:"<<a << std::endl;};

}

FP get_fun_ptr_ref()

{

int a = 2;

return [&](){std::cout << "& a:"<<a << std::endl;};

}