1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28<snippet>
<content><![CDATA[
//any undo feature
std::vector<std::pair<int &, int>> his;//history
void change(int &x, int y) {
his.emplace_back(x, x);
x = y;
}
void undo(int mark) {
while (int(his.size()) > mark) {
auto [x,y] = his.back();
his.pop_back();
x = y;
}
}
// whenever assignment operation happens, insteads of doing a = b, call change(a,b);
// using size of "his" as timeline, one can go back to any state.
]]></content>
<!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
<tabTrigger>any undo </tabTrigger>
<!-- Optional: Set a scope to limit where the snippet will trigger -->
<scope>source.c++</scope>
</snippet>