std::pmr::polymorphic_allocator::allocate
STD：：PMR：：多态[医]分配器：：分配
| T* allocate( std::size_t n | | (since C++17) |
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为n类型对象T使用底层内存资源。相当于return static_cast<T*>(this->resource()->allocate(n * sizeof(T), alignof(T))
参数
| n | - | the number of objects to allocate storage for |
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返回值
指向分配的存储的指针。
另见
| allocate static | allocates uninitialized storage using the allocator (public static member function of std::allocator_traits) |
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| allocate | allocates memory (public member function of std::pmr::memory_resource) |
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