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  1. #include <type_traits>
  2.  
  3. template<class As>
  4. struct any_char_ptr
  5. {
  6.   static const bool is_const = std::is_const<As>::value;
  7.  
  8.   typedef typename std::conditional<is_const,const char,char>::type
  9.           plain_char_type;
  10.   typedef typename std::conditional<is_const,const signed char,signed char>::type
  11.           signed_char_type;
  12.   typedef typename std::conditional<is_const,const unsigned char,unsigned char>::type
  13.           unsigned_char_type;
  14.  
  15.   As* ptr;
  16.  
  17.   any_char_ptr(plain_char_type* p)
  18.     : ptr(reinterpret_cast<As*>(p)) {}
  19.   any_char_ptr(signed_char_type* p)
  20.     : ptr(reinterpret_cast<As*>(p)) {}
  21.   any_char_ptr(unsigned_char_type* p)
  22.     : ptr(reinterpret_cast<As*>(p)) {}
  23.  
  24.   operator As*() const {return ptr;}
  25. };
  26.  
  27. #include <iostream>
  28.  
  29. void foo(any_char_ptr<unsigned char> p)
  30. {
  31.   std::cout << unsigned(*p) << std::endl;
  32. }
  33.  
  34. int main()
  35. {
  36.   char c=65; signed char s=66; unsigned char u=67;
  37.   foo(&c);
  38.   foo(&s);
  39.   foo(&u);
  40. }
  41.  
Success #stdin #stdout 0s 2928KB
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stdin
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Standard input is empty
stdout
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65
66
67
https://ideone.com/46D9L
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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