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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. namespace manips
  5. {
  6.     template <typename Cont, typename Delim=const char*>
  7.     struct PrintManip { 
  8.         PrintManip(Cont const& v, Delim d = ", ") : _v(v), _d(std::move(d)) { }
  9.  
  10.         Cont const& _v;
  11.         Delim _d;
  12.  
  13.         friend std::ostream& operator<<(std::ostream& os, PrintManip const& manip) {
  14.             using namespace std;
  15.             auto f = begin(manip._v), l(end(manip._v)); 
  16.  
  17.             os << "{ ";
  18.             while (f != l)
  19.                 if ((os << *f) && (++f != l))
  20.                     os << manip._d;
  21.             return os << " }";
  22.         }
  23.     };
  24.  
  25.     template <typename T, typename Delim=const char*> 
  26.     manips::PrintManip<T, Delim> print(T const& deduce, Delim delim = ", ") { 
  27.         return { deduce, std::move(delim) }; 
  28.     }
  29. }
  30.  
  31. using manips::print;
  32.  
  33. int main()
  34. {
  35.     const char* arr[] = { "hello", "bye" };
  36.     std::cout 
  37.         << "Woot, I can has " << print(arr)
  38.         << " and even: " << print(std::vector<int> { 1,2,3,42 }, ':') << "!\n"
  39.         << "or bizarrely: " << print(arr, print(arr)) << "\n";
  40. }
  41.  
Success #stdin #stdout 0s 2988KB
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stdin
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Standard input is empty
stdout
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Woot, I can has { hello, bye } and even: { 1:2:3:42 }!
or bizarrely: { hello{ hello, bye }bye }
https://ideone.com/E4G9Fp
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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