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deductiongu...rstd::tuple(3) C++ Standard Libary deductiongu...rstd::tuple(3) NAME deductionguidesforstd::tuple - deductionguidesforstd::tuple Synopsis Defined in header <tuple> template<class... UTypes> (1) (since C++17) tuple(UTypes...) -> tuple<UTypes...>; template<class T1, class T2> (2) (since C++17) tuple(std::pair<T1, T2>) -> tuple<T1, T2>; template<class Alloc, class... UTypes> (3) (since C++17) tuple(std::allocator_arg_t, Alloc, UTypes...) -> tuple<UTypes...>; template<class Alloc, class T1, class T2> tuple(std::allocator_arg_t, Alloc, std::pair<T1, T2>) -> tuple<T1, (4) (since C++17) T2>; template<class Alloc, class... UTypes> tuple(std::allocator_arg_t, Alloc, tuple<UTypes...>) -> (5) (since C++17) tuple<UTypes...>; These deduction guides are provided for std::tuple to account for the edge cases missed by the implicit deduction guides, in particular, non-copyable arguments and array to pointer conversion. 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 } http://cppreference.com 2022.07.31 deductiongu...rstd::tuple(3)
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