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  1. #include <cstdint>
  2.  
  3. #include <iostream>
  4. #include <limits>
  5.  
  6. #define define_result_type( t1, t2, r )\
  7. template <>\
  8. struct addition_result<t1,t2> {\
  9.     typedef r type;\
  10. }
  11.  
  12. template <typename T1, typename T2>
  13. struct addition_result;
  14.  
  15. define_result_type(int8_t, int8_t, int16_t);
  16. define_result_type(int16_t, int16_t, int32_t);
  17. define_result_type(int32_t, int32_t, int64_t);
  18.  
  19. template<typename T1, typename T2>
  20. typename addition_result<T1,T2>::type
  21. add( T1 const & lhs, T2 const & rhs ) {
  22.     typedef typename addition_result<T1,T2>::type result_type;
  23.  
  24.     return result_type(lhs) + result_type(rhs);
  25. };
  26.  
  27. int main() {
  28.    using namespace std;
  29.  
  30.    int32_t a, b;
  31.    a = b = numeric_limits<decltype(a)>::max();
  32.  
  33.    cout << a + b << endl;
  34.    cout << add(a, b) << endl;
  35. }
Success #stdin #stdout 0s 2884KB
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Standard input is empty
stdout
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-2
4294967294
https://ideone.com/Aapnx
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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