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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <sstream>
  4. #include <climits>
  5. #include <cstdint>
  6. #include <type_traits>
  7.  
  8. namespace hex_out_helper {
  9. 	constexpr int HEX_DIGIT_BITS = 4; // One hex digit = 4 bits.
  10. 	constexpr int HEX_BASE_CHARS = 2; // For the "0x".
  11.  
  12.     template<typename T> struct CharCheck {
  13.         using type = T;
  14.     };
  15.  
  16.     template<> struct CharCheck<signed char> {
  17.         using type = char;
  18.     };
  19.  
  20.     template<> struct CharCheck<unsigned char> {
  21.         using type = char;
  22.     };
  23.  
  24.     template<typename T> using CharChecker = typename CharCheck<T>::type;
  25. } // namespace hex_out_helper
  26.  
  27.  
  28. template<typename T> std::string hex_out_s(T val) {
  29.     using namespace hex_out_helper;
  30.  
  31. 	std::stringstream sformatter;
  32. 	sformatter << std::hex
  33. 			   << std::internal
  34. 			   << std::showbase
  35. 			   << std::setfill('0')
  36. 			   << std::setw((sizeof(T) * CHAR_BIT / HEX_DIGIT_BITS) + HEX_BASE_CHARS)
  37. 			   << (std::is_same<CharChecker<T>, char>{} ? static_cast<int>(val) : val);
  38. 	return sformatter.str();
  39. }
  40.  
  41. int main() {
  42. 	uint32_t       hexU32 = 0x0f;
  43. 	int            hexI   = 0x3c;
  44. 	unsigned short hexUS  = 0x12;
  45. 	char           hexC   = 0xf;
  46. 	unsigned char  hexUC  = 0xa;
  47. 	signed char    hexSC  = 0x3;
  48.  
  49. 	std::cout << "uint32_t: " << hex_out_s(hexU32) << std::endl;
  50. 	std::cout << "int: " << hex_out_s(hexI) << std::endl;
  51. 	std::cout << "unsigned short: " << hex_out_s(hexUS) << std::endl;
  52. 	std::cout << "char: " << hex_out_s(hexC) << std::endl;
  53. 	std::cout << "unsigned char: " << hex_out_s(hexUC) << std::endl;
  54. 	std::cout << "signed char: " << hex_out_s(hexSC) << std::endl;
  55. 	std::cout << "Decimal rvalues, too: " << hex_out_s(29) << std::endl;
  56. 	std::cout << "And a long long: " << hex_out_s(LLONG_MAX) << std::endl;
  57. }
Success #stdin #stdout 0s 3424KB
comments (?)
stdin 
Standard input is empty
stdout 
uint32_t: 0x0000000f
int: 0x0000003c
unsigned short: 0x0012
char: 0x0f
unsigned char: 0x0a
signed char: 0x03
Decimal rvalues, too: 0x0000001d
And a long long: 0x7fffffffffffffff
https://ideone.com/TexWXc
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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