deduction guides for std::tuple
Defined in header <tuple>
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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) |
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 }