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| template <typename F> | |
| void PrePost(F&& f) { | |
| std::cout << "pre\n"; | |
| f(); | |
| std::cout << "post\n"; | |
| } | |
| int main() { | |
| double a = 1.1; | |
| double b = 2.2; | |
| double c = 3.3; | |
| PrePost([&a, &b, c]() mutable { | |
| c = 4; | |
| std::cout << a << " " << b << " " << c << "\n"; | |
| }); | |
| return 0; | |
| } |
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