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std::scoped_allocator_adaptor<OuterAlloc,InnerAlloc...>:: allocate

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C++
Memory management library
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Allocators
Uninitialized memory algorithms
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( until C++20* )
( until C++20* )

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std::scoped_allocator_adaptor
定义于头文件 <scoped_allocator>
pointer allocate ( size_type n ) ;
(1) (C++11 起)
pointer allocate ( size_type n, const_void_pointer hint ) ;
(2) (C++11 起)

使用外部分配器分配未初始化的存储空间。

1) 调用 std:: allocator_traits < OuterAlloc > :: allocate ( outer_allocator ( ) , n ) 。
2) 额外提供内存局部性提示，通过调用 std:: allocator_traits < OuterAlloc > :: allocate ( outer_allocator ( ) , n, hint ) 。

参数

n - 要分配存储空间的对象数量
hint - 指向附近内存位置的指针

返回值

指向已分配存储的指针。

参见

分配未初始化的存储空间
( std::allocator<T> 的公开成员函数)
[static]
使用分配器分配未初始化的存储空间
( std::allocator_traits<Alloc> 的公开静态成员函数)