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std::uses_allocator<std::tuple> - cppreference.com

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template< class... Types, class Alloc > struct uses_allocator< std::tuple<Types...>, Alloc > : std::true_type { };

 (since C++11)

This specialization of std::uses_allocator informs other library components that tuples support uses-allocator construction, even though they do not have a nested allocator_type.

Inherited from std::integral_constant

Member constants

true
(public static member constant)

Member functions

converts the object to bool, returns value
(public member function)
returns value
(public member function)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>

Example

// myalloc is a stateful Allocator with a single-argument constructor
// that takes an int. It has no default constructor.

    using innervector_t = std::vector<int, myalloc<int>>;
    using elem_t = std::tuple<int, innervector_t>;
    using Alloc = std::scoped_allocator_adaptor< myalloc<elem_t>, myalloc<int>>;

    Alloc a(1,2);
    std::vector<elem_t, Alloc> v(a);
    v.resize(1);                  // uses allocator #1 for elements of v
    std::get<1>(v[0]).resize(10); // uses allocator #2 for innervector_t

See also

checks if the specified type supports uses-allocator construction
(class template) [edit]