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  1. namespace X
  2. {
  3.   template<typename T, unsigned int SIZE>
  4.   bool IsArray (T (&a)[SIZE]) { return true; }
  5.  
  6.   template<typename T>
  7.   bool IsArray (const T *&p) { return false; }
  8. }
  9.  
  10. namespace Y
  11. {
  12.   typedef char (&yes)[2];
  13.  
  14.   template<typename T, unsigned int SIZE>
  15.   yes IsArray (T (&a)[SIZE]);
  16.  
  17.   template<typename T>
  18.   char IsArray (const T *&p);
  19. }
  20.  
  21.  
  22. int main ()
  23. {
  24.   char s1[]  = "hello";
  25.   const char *s2   = "hello";
  26. #if 1
  27.   using namespace X;
  28.   if(true == IsArray(s2))
  29.     throw 0;
  30.   if(false == IsArray("12345"))
  31.     throw 0;
  32.   if(false == IsArray(s1))
  33.     throw 0;
  34. #else
  35.   using namespace Y;
  36.   if(sizeof(IsArray(s2)) == sizeof(yes))
  37.     throw 0;
  38.   if(sizeof(IsArray(s1)) != sizeof(yes))
  39.     throw 0;
  40. #endif
  41. }
Success #stdin #stdout 0.01s 2720KB
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stdout 
Standard output is empty
https://ideone.com/Rokmo
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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