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  1. #include <algorithm>
  2. #include <type_traits>
  3.  
  4. namespace fixed {
  5.     namespace std {
  6.         template <typename InputT, typename T>
  7.             auto accumulate (InputT from, InputT to, T init) ->
  8.               typename ::std::enable_if <::std::is_same<decltype(init+*from),decltype(init+*from+*from)>::value,
  9.                                        decltype(init+*from)>::type
  10.               {
  11.                   return ::std::accumulate(from, to, decltype(init+*from)(init));
  12.               }
  13.  
  14.         template <typename InputT, typename T, typename Op>
  15.             auto accumulate (InputT from, InputT to, T init, Op op) ->
  16.               typename ::std::enable_if <::std::is_same<decltype(op(init,*from)),decltype(op(op(init,*from),*from))>::value,
  17.                                        decltype(op(init,*from))>::type
  18.               {
  19.                   return ::std::accumulate(from, to, decltype(op(init,*from))(init));
  20.               }
  21.  
  22.     }
  23. }
  24.  
  25. #include <iterator>
  26. #include <iostream>
  27. int main ()
  28. {
  29.     int foo[] {1,2,3};
  30.     std::cout << fixed::std::accumulate (std::begin(foo), std::end(foo), 0.5) << std::endl;
  31.     double bar[] {1.1,2.2,3.3};
  32.     std::cout << fixed::std::accumulate (std::begin(bar), std::end(bar), 0) << std::endl;
  33. }
Success #stdin #stdout 0s 3456KB
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6.5
6.6
https://ideone.com/XrFP5b
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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