class template specialization
<utility>
std::tuple_size<pair>
| unspecialized |
template <class Tpl> class tuple_size;
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| pair specialization |
template <class T1, class T2>
struct tuple_size< pair<T1,T2> >; |
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Tuple traits for pair
Accesses the size of a pair object as if it was a tuple.
This class provides the size of the pair (which is always 2) as the constexpr member value of type size_t, as if inheriting integral_constant:
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2
3
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template <class Tpl> class tuple_size;
template <class T1, class T2>
struct tuple_size< pair<T1,T2> > : integral_constant <size_t,2> {};
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See tuple_size for more information.
Template parameters
- Tpl
- Tuple-like type. For this specialization:
pair<T1,T2>.
- T1, T2
- Type of the elements in the pair.
Member contants
| member constant | definition |
|---|
| value | (size_t)2 |
size_t is an unsigned integral type.