std::uses_allocator

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C++
 
实用工具库
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initializer_list（C++11）
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hash（C++11）
关系运算符
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
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Pairs and tuples
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pair
tuple（C++11）
piecewise_construct_t（C++11）
piecewise_construct（C++11）
掉期，远期和移动
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Swap, forward and move
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swap
forward（C++11）
move（C++11）
move_if_noexcept（C++11）
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动态内存管理
低级别的内存管理
分配器
Original:
Allocators
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allocator
allocator_traits（C++11）
allocator_arg_t（C++11）
allocator_arg（C++11）
uses_allocator（C++11）
scoped_allocator_adaptor（C++11）
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Garbage collection support
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Miscellaneous
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C库
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C Library
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Defined in header <memory>
template< class T, class Alloc >
struct uses_allocator
 （C++11 起）
如果T有一个的成员typedefallocator_type，这是转换从Alloc，提供了不变value等于true。否则value是false.
Original:
If T has a member typedef allocator_type which is convertible from Alloc, provides the member constant value equal to true. Otherwise value is false.
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目录

Inherited from std::integral_constant

Member constants

value
[静态的] </ SPAN></div></div>
true如果 T uses allocator Alloc，false其他方式
Original:
true if T uses allocator Alloc, false otherwise
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（公共静态成员常量）

Member functions

operator bool
转换的对象bool，返回value
Original:
converts the object to bool, returns value
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（公共成员函数）

Member types

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

</div>

[编辑] 专业化

自定义的类型特征std::uses_allocator所允许的类型，不具备的成员typedefallocator_type但满足以下两个条件之一的专业
Original:
Custom specializations of the type trait std::uses_allocator are allowed for types that do not have the member typedef allocator_type but satisfy one of the following two requirements:
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1)
T有std::allocator_arg_t作为第一个参数，Alloc作为第二个参数的构造函数，.
Original:
T has a constructor which takes std::allocator_arg_t as the first argument, and Alloc as the second argument.
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2)
T有Alloc作为最后一个参数的构造函数，.
Original:
T has a constructor which takes Alloc as the last argument.
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以下专业的标准库已经提供了
Original:
The following specializations are already provided by the standard library:
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（C++11）
专业的std::uses_allocator型特征
Original:
specializes the std::uses_allocator type trait
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（类模板专业化） [edit]
（C++11）
专业的std::uses_allocator型特征
Original:
specializes the std::uses_allocator type trait
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（函数模板） [edit]
（C++11）
专业的std::uses_allocator型特征
Original:
specializes the std::uses_allocator type trait
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（函数模板） [edit]
（C++11）
专业的std::uses_allocator型特征
Original:
specializes the std::uses_allocator type trait
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（函数模板） [edit]
（C++11）
专业的std::uses_allocator型特征
Original:
specializes the std::uses_allocator type trait
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（类模板专业化） [edit]
（C++11）
专业的std::uses_allocator型特征
Original:
specializes the std::uses_allocator type trait
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（类模板专业化） [edit]
（C++11）
专业的std::uses_allocator型特征
Original:
specializes the std::uses_allocator type trait
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（类模板专业化） [edit]

[编辑] 注释

此类型的特征是所使用的std::scoped_allocator_adaptor，并可以使用由自定义的分配，以确定是否正在构造的对象本身是能够使用一个分配器（例如是一个容器），在这种情况下，一个分配器应传递到其构造.
Original:
This type trait is used by std::scoped_allocator_adaptor and may be used by custom allocators to determine whether the object being constructed is itself capable of using an allocator (e.g. is a container), in which case an allocator should be passed to its constructor.
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[编辑] 另请参阅

（C++11）
一个对象的类型std::allocator_arg_t用来选择分配器感知的构造函数
Original:
an object of type std::allocator_arg_t used to select allocator-aware constructors
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（不变） [edit]
（C++11）
使用的标签类型选择分配器感知的构造函数重载
Original:
tag type used to select allocator-aware constructor overloads
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（类） [edit]
（C++11）
实现多级的多级容器分配器
Original:
implements multi-level allocator for multi-level containers
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（类模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/memory/uses_allocator&oldid=26720”