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  1. template<class _RanIt> inline
  2. 	void random_shuffle(_RanIt _First, _RanIt _Last)
  3. 	{	// shuffle [_First, _Last)
  4. 	_DEBUG_RANGE(_First, _Last);
  5. 	if (_First != _Last)
  6. 		_Random_shuffle(_Unchecked(_First), _Unchecked(_Last),
  7. 			_Dist_type(_First)); // alogithm, line #2237
  8. 	}
  9.  
  10. 	template<class _RanIt,
  11. 	class _Diff> inline
  12. 	void _Random_shuffle(_RanIt _First, _RanIt _Last, _Diff *)
  13. 	{	// shuffle [_First, _Last)
  14. 	const int _RANDOM_BITS = 15;	// minimum random bits from rand()
  15. 	const int _RANDOM_MAX = (1U << _RANDOM_BITS) - 1;
  16.  
  17. 	_RanIt _Next = _First;
  18. 	for (unsigned long _Index = 2; ++_Next != _Last; ++_Index)
  19. 		{	// assume unsigned long big enough for _Diff count
  20. 		unsigned long _Rm = _RANDOM_MAX;
  21. 		unsigned long _Rn = _CSTD rand() & _RANDOM_MAX;
  22. 		for (; _Rm < _Index && _Rm != ~0UL;
  23. 			_Rm = _Rm << _RANDOM_BITS | _RANDOM_MAX)
  24. 			_Rn = _Rn << _RANDOM_BITS
  25. 				| (_CSTD rand() & _RANDOM_MAX);	// build random value
  26.  
  27. 		_STD iter_swap(_Next, _First + _Diff(_Rn % _Index));	// swap a pair <=== here the error, line 2228 of algorithm
  28. 		}
  29. 	}
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cpp: In function 'void _Random_shuffle(_RanIt, _RanIt, _Diff*)':
prog.cpp:21:23: error: '_CSTD' was not declared in this scope
prog.cpp:21:29: error: expected ',' or ';' before 'rand'
prog.cpp:25:14: error: expected ')' before 'rand'
prog.cpp:27:3: error: '_STD' was not declared in this scope
prog.cpp:27:8: error: expected ';' before 'iter_swap'
stdout 
Standard output is empty
https://ideone.com/V94up
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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