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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. #define CALL_TILL_FALIURE sequence_call_till_failure()
  5.  
  6. class sequence_call_till_failure
  7. {
  8.     bool success;
  9. public:    
  10.     sequence_call_till_failure() : success(false) { }
  11.  
  12.     template < typename Func, typename... Args >
  13.     sequence_call_till_failure&
  14.     operator()( Func func, Args... args ) {
  15.  
  16.         if( !success )
  17.             success = success || func( std::forward<Args>(args)... );
  18.  
  19.         return *this;
  20.     }
  21.  
  22.     operator bool() const {
  23.         return success;
  24.     }
  25. };
  26.  
  27. bool PlanA() { std::cout << __FUNCTION__ << std::endl; return false; }
  28. bool PlanB() { std::cout << __FUNCTION__ << std::endl; return false; }
  29. bool PlanC() { std::cout << __FUNCTION__ << std::endl; return false; }
  30. bool is_odd( int value ) { std::cout << __FUNCTION__ << std::endl; return value % 2 == 1; }
  31. int add( int lhs, int rhs ) { std::cout << __FUNCTION__ << std::endl; return lhs + rhs; }
  32. bool Error() { std::cout << __FUNCTION__ << std::endl; return false; }
  33.  
  34. int main() {
  35.  
  36.     using namespace std;
  37.  
  38.     bool result = CALL_TILL_FALIURE( PlanA )( PlanB )( PlanC )( is_odd, 2 )( add, 2, 3 )( Error );
  39.  
  40.     cout << result << endl;
  41. }
Success #stdin #stdout 0s 2852KB
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stdin
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Standard input is empty
stdout
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PlanA
PlanB
PlanC
is_odd
add
1
https://ideone.com/hEqekN
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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