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main.cpp

#include <iostream> #include<map> #include<string> #include<vector> struct configfs { int & foo; configfs(int & foo_) : foo(foo_) {} void set_foo(int & foo_) { foo = foo_; } }; int main() { int a = 1; configfs conf(a); a = 3; std::cout << conf.foo<<std::endl; // 3 std::cout << a<<std::endl;; // 3 int b = 2; conf.set_foo(b); std::cout<<a<<std::endl; //prints 2 return 0; }

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