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std::uses_allocator<std::tuple>

STD：：用途[医]分配器<std：：tuple>

Defined in header ​​
template< class... Types, class Alloc > struct uses_allocator< std::tuple<Types...>, Alloc > : std::true_type { };​(since C++11)

这种专业化std::uses_allocator通知其他库组件元组支持用途分配器构造，即使它们没有嵌套的allocator_type...

继承自STD：积分[医]常量

成员常数

value statictrue (public static member constant)

成员函数

operator boolconverts the object to bool, returns value (public member function)
operator() (C++14)returns value (public member function)

成员类型

TypeDefinition
value_typebool
typestd::integral_constant<bool, value>

例

二次

// myalloc is a stateful Allocator with a single-argument constructor
// that takes an int. It has no default constructor.
 
    typedef std::vector<int, myalloc<int>> innervector_t;
    typedef std::tuple<int, innervector_t> elem_t;
    typedef std::scoped_allocator_adaptor< myalloc<elem_t>, myalloc<int>> Alloc;
    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

二次

另见

uses_allocator (C++11)checks if the specified type supports uses-allocator construction (class template)

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http：//en.cppreference.com/w/cpp/实用程序/tuple/use[医]分配器

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