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110 lines (98 loc) · 2.73 KB
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#include <bits/stdc++.h>
#include <string>
struct Wrapper {
Wrapper *next = nullptr;
void (*func)(std::string);
void (*before)();
void (*after)();
static Wrapper first;
static Wrapper *last;
};
Wrapper Wrapper::first;
Wrapper *Wrapper::last = &Wrapper::first;
Wrapper *create (void (*func)(std::string), void (*before)(), void (*after)()) {
Wrapper *wrapper = new Wrapper;
wrapper->func = func;
wrapper->before = before;
wrapper->after = after;
Wrapper::last->next = wrapper;
Wrapper::last = wrapper;
return wrapper;
}
void remove (const Wrapper *wrapper) {
Wrapper *current = &Wrapper::first;
while (current->next != nullptr && current->next != wrapper) current = current->next;
if (current->next == nullptr) return;
current->next = wrapper->next;
if (wrapper == Wrapper::last) Wrapper::last = current;
delete wrapper;
}
void run (const Wrapper *wrapper, const std::string &arg) {
wrapper->before();
wrapper->func(arg);
wrapper->after();
}
void destroy () {
Wrapper *current = &Wrapper::first;
while (current->next != nullptr) {
Wrapper *aboutToDelete = current;
current = current->next;
if (aboutToDelete != &Wrapper::first) delete aboutToDelete;
}
if (current != &Wrapper::first) delete current;
Wrapper::last = &Wrapper::first;
Wrapper::first.next = nullptr;
}
using namespace std;
void foo (string id) { cout << id << endl; }
void before () { cout << "before foo" << endl; }
void after () { cout << "after foo" << endl; }
int main (){
destroy();
destroy();
destroy();
create(foo, before, after);
destroy();
destroy();
destroy();
destroy();
Wrapper *f = create(foo, before, after);
run(f, "Hello");
Wrapper *g = create(foo, after, before);
run(g, "World!");
remove(g);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
remove(g);
g = create(foo, after, before);
remove(g);
g = create(foo, after, before);
remove(g);
g = create(foo, after, before);
remove(g);
g = create(foo, after, before);
remove(g);
g = create(foo, after, before);
remove(g);
g = create(foo, after, before);
remove(g);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
g = create(foo, after, before);
destroy();
destroy();
destroy();
return 0;
}