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  1. #include <cstdlib>
  2. #include <algorithm>
  3. #include <iostream>
  4. #include <string>
  5. #include <random>
  6. #include <functional>
  7.  
  8. template <typename DataType = uint32_t>
  9. using randomizer_t = std::independent_bits_engine<
  10.                      std::default_random_engine,
  11.                      sizeof(DataType)*4, DataType>;
  12.  
  13. template <class T, class Compare>
  14. constexpr const T& clamp( const T& v, const T& lo, const T& hi, Compare comp )
  15. {
  16.     return comp(v, hi) ? std::max(v, lo, comp) : std::min(v, hi, comp);
  17. }
  18.  
  19. template <class T>
  20. constexpr const T& clamp( const T& v, const T& lo, const T& hi )
  21. {
  22.     return clamp( v, lo, hi, std::less<>() );
  23. }
  24.  
  25. int main() {
  26.  
  27.     std::vector<int> vec(25);
  28.     randomizer_t<uint32_t> randomizer;
  29.  
  30.     std::generate(std::begin(vec),
  31.                   std::end(vec),
  32.                   std::ref(randomizer));
  33.  
  34.     std::for_each(std::begin(vec),
  35.                   std::end(vec),
  36.                   [](int datapoint) {
  37.  
  38.         std::cout << "         raw value: " << datapoint << std::endl
  39.                   << " clamped to int8_t: " << clamp(datapoint, -128, 127) << std::endl
  40.                   << "clamped to uint8_t: " << clamp(datapoint, 0, 255) << std::endl
  41.                   << std::endl;
  42.     });
  43.  
  44.     return 0;
  45. }
Success #stdin #stdout 0.01s 5520KB
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stdin
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Standard input is empty
stdout
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         raw value: 16806
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 15088
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 44248
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 3113
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 46977
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 56007
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 36567
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 2557
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 12098
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 1100
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 39063
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 15444
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 4747
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 56289
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 54450
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 14150
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 14614
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 16656
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 50071
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 18771
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 11822
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 11024
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 38444
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 35588
 clamped to int8_t: 127
clamped to uint8_t: 255

         raw value: 12887
 clamped to int8_t: 127
clamped to uint8_t: 255
https://ideone.com/IpcDt9
C(plusplus)17 std::clamp(…) demo
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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