deduction guides for
std::tuple
From cppreference.com
C++
Utilities library
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std::tuple
| Member functions | ||||
| Non-member functions | ||||
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(until C++20)
(until C++20)
(until C++20)
(until C++20)
(until C++20)
(C++20)
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| Helper concepts | ||||
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(C++23)
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| Helper classes | ||||
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(C++23)
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(C++23)
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| Deduction guides (C++17) |
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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 }
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