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| #define DEFER_CAT_(A, B) A ## B ## _ | |
| #define DEFER_CAT(A, B) DEFER_CAT_(A, B) | |
| template <typename Func> | |
| struct Defer { | |
| Func fn; | |
| Defer(Func fn_) : fn(fn_) {} | |
| ~Defer() { fn(); } | |
| }; | |
| // Executes expression at the end of the enclosing scope. | |
| #define defer(expr) auto DEFER_CAT(defer_exp_, __LINE__) = Defer([&] { expr; }) |
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