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      deduction guides forstd::tuple

      From cppreference.com
      <cpp‎ |utility‎ |tuple
       
       
      Utilities library
       
       
      Defined in header<tuple>
      template<class...UTypes>
      tuple(UTypes...)-> tuple<UTypes...>;
      (1)(since C++17)
      template<class T1,class T2>
      tuple(std::pair<T1, T2>)-> tuple<T1, T2>;
      (2)(since C++17)
      template<class Alloc,class...UTypes>
      tuple(std::allocator_arg_t, Alloc, UTypes...)-> tuple<UTypes...>;
      (3)(since C++17)
      template<class Alloc,class T1,class T2>
      tuple(std::allocator_arg_t, Alloc,std::pair<T1, T2>)-> tuple<T1, T2>;
      (4)(since C++17)
      template<class Alloc,class...UTypes>
      tuple(std::allocator_arg_t, Alloc, tuple<UTypes...>)-> tuple<UTypes...>;
      (5)(since C++17)

      Thesededuction guides are provided forstd::tuple to account for the edge cases missed by the implicit deduction guides, in particular, non-copyable arguments and array to pointer conversion.

      [edit]Example

      Run this code
      #include <tuple>int main(){int a[2], b[3], c[4];std::tuple t1{a, b, c};// explicit deduction guide is used in this case}
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/utility/tuple/deduction_guides&oldid=117403"

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