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  1. #include <iostream>
  2. #include <type_traits>
  3. #include <tuple>
  4. #include <iomanip>
  5.  
  6. template <typename T,typename Tuple, size_t... Is>
  7. void multiply_tuple_elements(T coeff, Tuple& tuple,std::index_sequence<Is...>)
  8. {
  9.     using do_= int[];
  10.     (void)do_{0, ( 
  11.             std::get<Is>(tuple)*=coeff
  12.     ,0)...}; 
  13. }
  14.  
  15. int main()
  16. {
  17.     double coeff = 2.0;
  18.     std::tuple<double, double, double> m_size = std::make_tuple(1.0, 1.0, 1.0);
  19.     multiply_tuple_elements(
  20.             coeff,
  21.             m_size ,
  22.             std::make_index_sequence<std::tuple_size<decltype(m_size)>::value>()
  23.     );
  24.  
  25.     std::cout << std::fixed;
  26.     std::cout << std::get<0>(m_size) << std::endl;
  27.     std::cout << std::get<1>(m_size) << std::endl;
  28.     std::cout << std::get<2>(m_size) << std::endl;
  29.  
  30.     return 0;
  31. }
Success #stdin #stdout 0s 4372KB
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stdin
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Standard input is empty
stdout
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2.000000
2.000000
2.000000
https://ideone.com/mVHvmX
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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