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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. namespace Sys {
  5.  
  6. // RANGE BASED Loops
  7. class range {
  8. private:
  9.     int first;
  10.     int last;
  11.     int iter;
  12.  
  13. public:
  14.     range(int end):
  15.         first(0),
  16.         last(end),
  17.         iter(0)
  18.     {}
  19.  
  20.     range(int start, int end) :
  21.         first(start),
  22.         last(end),
  23.         iter(start)
  24.     {}
  25.  
  26.     // Iterable functions
  27.     const range& begin() const { return *this; }
  28.     const range& end() const { return *this; }
  29.  
  30.     // Iterator functions
  31.     bool operator!=(const range&) const { return iter < last; }
  32.     void operator++() { ++iter; }
  33.     int operator*() const { return iter; }
  34. };
  35.  
  36. // Golang style DEFER
  37. // Usage defer(statement);
  38.  
  39. template <typename F>
  40. struct DeferredAction {
  41. private:
  42. 	F f;
  43. public:
  44. 	DeferredAction(F f) : f(f) {}
  45. 	~DeferredAction() { f(); }
  46. };
  47.  
  48. template <typename F>
  49. DeferredAction<F> defer_func(F f) {
  50. 	return DeferredAction<F>(f);
  51. }
  52.  
  53. #define $DEFER_1(x, y) x##y
  54. #define $DEFER_2(x, y) $DEFER_1(x, y)
  55. #define $DEFER_3(x)    $DEFER_2(x, __COUNTER__)
  56. #define $defer(code)   auto $DEFER_3(_defer_) =     ::Sys::defer_func([&](){code;})
  57.  
  58. }
  59.  
  60. int main() {
  61. 	// your code goes here
  62. 	$defer(std::cout << "Hello World");
  63. 	return 0;
  64. }
Success #stdin #stdout 0s 4380KB
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Standard input is empty
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Hello World
https://ideone.com/oTpwVb
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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